US20100016975A1 - Glenoid Component For Shoulder Arthroplasty - Google Patents
Glenoid Component For Shoulder Arthroplasty Download PDFInfo
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- US20100016975A1 US20100016975A1 US12/565,039 US56503909A US2010016975A1 US 20100016975 A1 US20100016975 A1 US 20100016975A1 US 56503909 A US56503909 A US 56503909A US 2010016975 A1 US2010016975 A1 US 2010016975A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B34/00—Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
- A61B34/10—Computer-aided planning, simulation or modelling of surgical operations
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/40—Joints for shoulders
- A61F2/4081—Glenoid components, e.g. cups
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
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- A61F2/3094—Designing or manufacturing processes
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- A—HUMAN NECESSITIES
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- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30108—Shapes
- A61F2002/3011—Cross-sections or two-dimensional shapes
- A61F2002/30138—Convex polygonal shapes
- A61F2002/30156—Convex polygonal shapes triangular
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30604—Special structural features of bone or joint prostheses not otherwise provided for modular
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- A—HUMAN NECESSITIES
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- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/3094—Designing or manufacturing processes
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- A61F2002/30948—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques using computerized tomography, i.e. CT scans
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/3094—Designing or manufacturing processes
- A61F2/30942—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
- A61F2002/30952—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques using CAD-CAM techniques or NC-techniques
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/3094—Designing or manufacturing processes
- A61F2/30942—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
- A61F2002/30957—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques using a positive or a negative model, e.g. moulds
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/3094—Designing or manufacturing processes
- A61F2/30942—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
- A61F2002/30962—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques using stereolithography
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
- A61F2230/0017—Angular shapes
- A61F2230/0023—Angular shapes triangular
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2240/00—Manufacturing or designing of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2240/001—Designing or manufacturing processes
- A61F2240/002—Designing or making customized prostheses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y80/00—Products made by additive manufacturing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
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- Heart & Thoracic Surgery (AREA)
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- Transplantation (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Robotics (AREA)
- Vascular Medicine (AREA)
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- Theoretical Computer Science (AREA)
- Prostheses (AREA)
Abstract
Description
- This application is a Continuation Application of U.S. application Ser. No. 11/524,335, filed Sep. 20, 2006, and entitled Glenoid Component For Shoulder Arthroplasty, the disclosure of the above-identified patent application is hereby totally incorporated by reference in its entirety.
- The present invention relates generally to the field of orthopedics, and, more particularly, to glenoid component apparatuses for shoulder arthroplasty and methods for making them.
- Arthroplasty is the surgical replacement of one or more bone structures of a joint with one or more prostheses. Shoulder arthroplasty often involves replacement of the glenoid fossa of the scapula with a prosthetic glenoid component. The conventional glenoid component typically provides a generally laterally or outwardly facing generally concave bearing surface against which a prosthetic humeral head (or, alternatively, the spared natural humeral head in the case of a glenoid hemi-arthroplasty) may bear during operation of the joint. The conventional glenoid component typically also includes a generally medially or inwardly projecting stem for fixing the glenoid component in a cavity constructed by suitably resecting the glenoid fossa and suitably resecting cancellous bone from the glenoid vault.
- Various stem designs have been proposed for ensuring proper alignment and secure and lasting fixation of the glenoid component within the glenoid vault. However, the glenoid vault has a complex morphology. While three-dimensionally shaping a stem for compatibility with the endosteal walls of the glenoid vault can potentially significantly enhance fixation of the glenoid component, historical designs have not taken full advantage of this opportunity.
- One advantageous approach is described in co-pending application Ser. No. 10/259,045, published on Apr. 1, 2004 as US2004/0064189 A1 and entitled “Concave Resurfacing Prosthesis”, the disclosure of which is incorporated herein by reference. In this approach, a glenoid component is fitted to at least partially fill a cavity formed in the glenoid vault. The component has a generally oval inverted dome shape to generally conform to the shape of the vault. However, it is recognized in the '045 application that exact sizing of the glenoid component to the vault cavity is made difficult by the unique anatomy of each patient. To address this difficulty, the '045 application discloses providing a series of differently sized glenoid components.
- There remains a need for a glenoid component that is more nearly sized and shaped in three-dimensions to fill the cavity in the glenoid vault. There is a further need for a technique that facilitates preparation of such a component, and especially a component that has more universal applicability to the anatomy of most patients.
- The present invention provides a glenoid component apparatus for shoulder arthroplasty. The apparatus includes a bearing portion and further includes a stem portion extending from the bearing portion. The stem portion models a normalized or pathologic glenoid vault morphology.
- In an alternative embodiment, the present invention provides a method for making a glenoid component for shoulder arthroplasty. The method includes obtaining a model of a normal or pathologic glenoid vault morphology and further includes producing a portion of the glenoid component based on the model.
- In another alternative embodiment, the present invention provides a glenoid component apparatus for a shoulder joint including at least one of a natural humeral component and a prosthetic humeral component. The apparatus includes a means for bearing against at least one of the natural humeral component and the prosthetic humeral component. The apparatus further includes a means, extending from the bearing means, for modeling a normal glenoid vault morphology.
- The above-noted features and advantages of the present invention, as well as additional features and advantages, will be readily apparent to those skilled in the art upon reference to the following detailed description and the accompanying drawings, which include a disclosure of the best mode of making and using the invention presently contemplated.
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FIG. 1 shows an exploded perspective view of an exemplary shoulder prosthesis including an exemplary glenoid component according to the present invention; -
FIG. 2 a,FIG. 2 b, andFIG. 2 c show a flow diagram of an exemplary method for configuring the stem of the prosthesis ofFIG. 1 to model a normal or pathologic glenoid vault morphology; -
FIG. 3 shows a rectangular (“Cartesian”) coordinates reference system relative to the plane body of a typical scapula as defined by three surface points of the scapula; -
FIG. 4 shows the superior-inferior (“SI”) dimension and the anterior-posterior (“AP”) dimension of the typical glenoid fossa; -
FIG. 5 shows a table listing exemplary range and exemplary average SI dimension for six exemplary sub-groups of scapulae from a scapulae sample based on their SI dimensions; -
FIG. 6 shows an exemplary substantially complete tracing (toward the inferior end of the typical glenoid fossa) of the endosteal walls of the typical glenoid fossa; -
FIG. 7 shows an exemplary partial tracing (toward the inferior end of the typical glenoid fossa) of the endosteal walls of the typical glenoid fossa as a result of fossa occlusion in the region of the typical scapular spine; -
FIG. 8 shows views of a volumetric rendering of a relatively complex model of the normal glenoid vault morphology of the scapulae sample; -
FIG. 9 shows views of a volumetric rendering of an intermediate 3-D model of the normal glenoid vault morphology of the scapulae sample based on the relatively complex 3-D model ofFIG. 8 ; -
FIG. 10 shows a perspective view of a simplified 3-D model of the average normal glenoid vault morphology of the scapulae sample based on the intermediate 3-D model ofFIG. 9 ; -
FIG. 11 shows a superior view of each of the triangular cross sections of the simplified 3-D model ofFIG. 10 ; -
FIG. 12 shows a table listing the respective width dimension, depth dimension, and resulting area of the triangular cross sections of the simplified 3-D model ofFIG. 10 ; and -
FIG. 13 shows a table listing the coordinates for the respective vertexes of the triangular cross sections of the simplified 3-D model ofFIG. 10 relative to the rectangular (“Cartesian”) coordinates reference system ofFIG. 3 . - Like reference numerals refer to like parts throughout the following description and the accompanying drawings.
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FIG. 1 shows an exploded perspective view of anexemplary shoulder prosthesis 100 including anexemplary glenoid component 120 according to the present invention.Prosthesis 100 also includes an exemplaryhumeral component 140.Humeral component 140 is configured in a known manner for implantation in ahumerus 160 and replacement of a natural humeral head (not shown) and, accordingly, includes a prosthetichumeral head 180. - Glenoid
component 120 is configured for implantation in ascapula 200 and replacement of a natural glenoid fossa (not shown inFIG. 1 ). Glenoidcomponent 120 includes abearing 220. Bearing 220 is made from a durable biocompatible plastic or any other suitable durable biocompatible material. For example, bearing 220 may be made from a polyethylene. One particular polyethylene that is well suited for bearing 220 is a high molecular weight polyethylene, for example ultra-high molecular weight polyethylene (“UHMWPE”). One such UHMWPE is sold as by Johnson & Johnson of New Brunswick, N.J. as MARATHON™ UHMWPE and is more fully described in U.S. Pat. Nos. 6,228,900 and 6,281,264 to McKellop, which are incorporated herein by reference. Bearing 220 includes a generallyconcave surface 240 that is configured as known for bearing against prosthetichumeral head 180 or, in cases where the natural humeral head is spared, for bearing against the natural humeral head. Bearing 220 further includes apost 260, or some other feature or mechanism capable of mating the bearing to a stem element of the glenoid component, such asstem 280 discussed below. - Glenoid
component 120 also includes astem 280. As discussed further below,stem 280 is configured to model a normal or pathologic glenoid vault morphology such thatstem 280 fits within acavity 300 that may be defined, at least partially, byendosteal walls 320 ofscapula 200. To this end, it is noted that the present invention may provide a series of rigidly scaled or sized versions ofstem 280 for accommodating various glenoid vault sizes that may be presented among different patients. It should also be appreciated that the glenoid vault ofscapula 200 may include somecancellous bone 340. -
Stem 280 is made from a suitable biocompatible metal such as, for example, a cobalt chromium alloy, a stainless steel alloy, a titanium alloy, or any other suitable durable material. In alternative embodiments,stem 280 may include a porous coating to facilitate bone in-growth intoglenoid component 120. The porous coating may be any suitable porous coating and may for example be POROCOAT®, a product of Johnson & Johnson of New Brunswick, N.J. and more fully described in U.S. Pat. No. 3,855,638 to Pilliar, which is incorporated herein by reference.Stem 280 can be solid or a thin shell of suitable durable material. -
Stem 280 includes a generallysuperior surface 360, a generallyinferior surface 380, a generally anterior-medial surface 400, a generally posterior-medial surface 420, and a generallylateral surface 440.Stem 280 defines asocket 460 that extends inwardly fromsurface 440.Socket 460 receives post 260 (of bearing 220).Stem 280 may also define a through-channel 480 that extends, coaxially withsocket 460, throughstem 280. -
Glenoid component 120 further includes afastener 500 in the form of, for example, a screw. The screw, or screws, may be any screw capable of additionally securingglenoid component 120 withinscapula 200. For example, the screw may be a cortical screw such as DePuy Ace catalog number 8150-36-030 available from DePuy Orthopaedics, Inc. of Warsaw, Ind. The screw has a diameter sufficient to properly secureglenoid component 120 withinscapula 200 and may, for example, have a diameter of about two to five millimeters. The screw may have any suitable length capable of properly securingglenoid component 120 withinscapula 200. For example, the screw may have a length of from 10 to 60 millimeters. The screw may be secured to stem 280 in any suitable manner. In the exemplary embodiment,fastener 500 extends through through-channel 480 (of stem 280). However, it is noted thatfastener 500 is not indispensable and may be omitted from alternative embodiments. - Bearing 220 is secured to stem 280 in any suitable manner. For example, bearing 220 may be bonded to stem 280, or bearing 220 could be made from polyethylene and compression molded to stem 280. Alternately, the
bearing 220 may be glued to stem 280 by, for example, an adhesive. Alternatively, bearing 220 may be mechanically interlocked to stem 280 by taper locking or otherwise press-fittingpost 260 insocket 460, or post 260 andsocket 460 may include any other suitable interlocking features, for example, rib(s), lip(s), detent(s), and/or other protrusion(s) and mating groove(s), channel(s), or indent(s) (not shown). Additionally, it is noted that in alternative embodiments, bearing 220 and stem 280 may be integrated into a single part made from UHMWPE or any other suitable material—with or without an omission offastener 500. - The present invention contemplates a method for preparing a glenoid component that will satisfy a majority of patient anatomies. Thus, in accordance with one method, the steps described in flow diagrams of
FIGS. 2 a-2 c correspond to one exemplary method used to model the normal or pathologic glenoid vault morphology, and ultimately to prepare an optimally sized and configured implant. - In a first step 1020 (
FIG. 2 a), a suitable sample of human scapulae (“scapulae sample”) is selected to represent a reasonable demographic cross section of an anticipated patient population. In the exemplary embodiment, the scapulae sample included sixty-one human scapulae selected from different sources, thirty-two left-sided and twenty-eight right-sided. Various criteria were applied to the selection process so that the sample was as representative of the patient population as possible, including height, sex, gender and ethnicity. - At step 1040 (
FIG. 2 a), volumetric scan of each scapula in the sample was performed using a Siemens Volume Zoom Scanner (a CT scanner available from Siemens Medical Systems of Malvern, Pa.). It is noted that the initial orientation of the scapulae in the CT images is dependent on the physical placement and orientation of the scapulae within the CT scanner, which is inherently difficult to reproduce. Nevertheless, the scapulae were placed in a supine anatomic position and axial images were obtained in one mm increments (with 0.27 to 0.35 mm in-plane resolution). The images were acquired at 120 kV, 100 mA, using a 180 mm field-of-view, large focal spot, and rotation speed of 0.5 sec/rev. A medium-smooth reconstruction algorithm was used for reconstruction of the images. -
FIG. 3 shows a rectangular (“Cartesian”) coordinatesreference system 1060 relative to the plane body of atypical scapula 1080 as defined by threesurface points scapula 1080. As at least partially discernable fromFIG. 3 ,point 1100 represents an inferior tip of thescapula 1080,point 1120 represents a medial pole of thescapula 1080 where the spine intersects thescapula 1080, andpoint 1140 represents the center of thetypical glenoid fossa 1160. Further, it should be appreciated that coordinatesreference system 1060 defines, among other things, an XZ-plane 1180, an XY-plane 1190, avector 1200 extending from the medial pole of the scapula to the center of theglenoid fossa 1160, and anX-axis 1220. - At step 1230 (
FIG. 2 a), the three-dimensional (“3-D”) images of the scapulae were re-sampled to align them on coordinates reference system 1060 (seeFIG. 3 ) for subsequent analysis. In the exemplary embodiment, points 1100, 1120, and 1140 were interactively chosen on the 3-D image of each scapula and the scapulae were again re-sampled such that the plane of the body of each scapula was aligned parallel to the XZ-plane 1180 of the coordinates reference system 1060 (seeFIG. 3 ), and such that thevector 1200 extending from the medial pole of the scapula to the center of theglenoid fossa 1160 was parallel to the X-axis 1220 (seeFIG. 3 ). -
FIG. 4 shows the superior-inferior (“SI”)dimension 1240 and the anterior-posterior (“AP”)dimension 1260 of theglenoid fossa 1160. At step 1280 (FIG. 2 a), theSI dimension 1240 and the AP dimension 1260 (seeFIG. 4 ) of each scapula was determined by interactively placing points on the 3-D images using a suitable software program. - At step 1300 (
FIG. 2 a), the scapulae sample were arbitrarily divided into six sub-groups based on their SI dimensions 1240 (seeFIG. 4 ) to reduce the initial number of morphological comparisons and to facilitate determination of the relationship between the global or overall typical glenoid vault size and the typical glenoid vault morphology.FIG. 5 shows a table listing exemplary range and exemplary average SI dimension for the six sub-groups of scapulae based on their SI dimensions. - At step 1420 (
FIG. 2 a), theendosteal walls 320 of the glenoid vaults of the scapulae were manually traced and digitized.FIG. 6 shows a substantially complete tracing 1320 (toward the inferior end of the typical glenoid fossa 1160) of theendosteal walls 320 of thetypical glenoid fossa 1160.FIG. 7 shows a partial tracing 1360 (toward the inferior end of the typical glenoid fossa 1160) of theendosteal walls 320 of thetypical glenoid fossa 1160 as a result of fossa occlusion in the region of the typicalscapular spine 1380. Reference line 1400 (FIG. 7 ) is discussed further below. Each endosteal boundary was traced on each of the two-dimensional (“2-D”) XY-slices of the respective re-sampled image (seeFIG. 6 ), starting at the respective glenoid fossa and extending medially to the scapular spine 1380 (seeFIG. 7 ), but not into the interior of the spine. Both the anterior and posterior wall tracings in the region of the spine are terminated at reference line 1400 (seeFIG. 7 ), which was defined to be simultaneously perpendicular to the plane of the respective glenoid fossa and tangential to the surface of the respective endosteal notch. - At step 1440 (
FIG. 2 a), each endosteal tracing defining the respective glenoid vault was normalized by its extent in the SI dimension. This measurement was made from the inferior limit of the endosteal walls of the glenoid fossa to the superior limit in the Z-dimension (seeFIG. 3 ) of the image. The vaults were rigidly scaled in all three dimensions (i.e., X, Y, and Z) to normalize the SI dimension of the vault tracing to the average within its corresponding sub-grouping. This approach substantially eliminated size differences between the different vaults, facilitating an appropriate shape determination. An assumption was made that right-sided and left-sided scapulae are approximately anatomically symmetrical. Under this assumption, right-sided vaults were mirrored about the XZ-plane (seeFIG. 3 ) to allow morphological determinations to be made within the entire sample. In the exemplary embodiment, the normalized vaults within each of the six scapular sub-groupings were spatially aligned (i.e., “registered”) using an iterative closet point (“ICP”) algorithm such as discussed in Besl P. J. and McKay N. D., “A method for registration of 3-D shapes,” IEEE Trans. Pattern Analysis and Machine Intelligence 1992,volume 14, pages 239-256, which is incorporated herein by reference. - At step 1460 (
FIG. 2 b), a 3-D model of the normalized glenoid vault morphology was then constructed for each sub-group of the scapulae of the scapulae sample based on the morphological constraints imposed by each of the vaults in the sub-group. For each sub-group, the set of registered glenoid vaults were overlaid and the approximate average endosteal walls 320 (seeFIG. 6 andFIG. 7 ) of the sub-group were manually digitized. Each endosteal boundary was traced on each of the two-dimensional (“2-D”) XY-slices of the respective re-sampled image (seeFIG. 6 ), starting at the respective glenoid fossa and extending medially to the scapular spine 1380 (seeFIG. 7 ), but not into the interior of the spine. Both the anterior and posterior wall tracings in the region of the spine were terminated at reference line 1400 (seeFIG. 7 ), which was defined to be simultaneously perpendicular to the plane of the respective glenoid fossa and tangential to the surface of the respective endosteal notch. The resulting 3-D model satisfied the endosteal wall boundaries for each vault within the group. - At step 1480 (
FIG. 2 b), a relatively complex 3-D model 1500 (seeFIG. 8 ) approximating the average normalized glenoid vault morphology of the entire scapulae sample was constructed based on the morphological constraints imposed by the models for each sub-group. The registered glenoid vaults for the sub-groups were overlaid and the approximate average endosteal walls 320 (seeFIG. 6 andFIG. 7 ) of the sub-group models were manually digitized. Each endosteal boundary was again traced on each of the two-dimensional (“2-D”) XY-slices of the respective re-sampled image (seeFIG. 6 ), starting at the respective glenoid fossa and extending medially to the scapular spine 1380 (seeFIG. 7 ), but not into the interior of the spine. Both the anterior and posterior wall tracings in the region of the spine were terminated at reference line 1400 (seeFIG. 7 ), which was defined to be simultaneously perpendicular to the plane of the respective glenoid fossa and tangential to the surface of the respective endosteal notch. The resulting 3-D model 1500 satisfies the endosteal wall boundaries for each vault within the scapulae sample. -
FIG. 8 shows views of a volumetric rendering of the relatively complex 3-D model 1500 generated in the previous steps. As at least partially discernable inFIG. 8 ,model 1500 includes a generallysuperior surface 1520, a generallyinferior surface 1540, a generally anterior-medial surface 1560, a generally posterior-medial surface 1580, and a generallylateral surface 1600. It should be appreciated that generally superior surface 360 (of stem 280) corresponds roughly to generallysuperior surface 1520, generally inferior surface 380 (of stem 280) corresponds roughly to generallyinferior surface 1540, generally anterior-medial surface 400 (of stem 280) corresponds roughly to generally anterior-medial surface 1560, generally posterior-medial surface 420 (of stem 280) corresponds roughly to generally posterior-medial surface 1580, and generally lateral surface 440 (of stem 280) corresponds roughly to generallylateral surface 1600. - At step 1720 (
FIG. 2 b), intermediate 3-D model 1700 was constructed by inscribing a plurality of mutually parallel triangular cross sections within the boundaries defined by the model walls on a plurality of XY-plane (seeFIG. 3 ) cross-sections of relatively complex 3-D model 1500 (seeFIG. 8 ).FIG. 9 shows views of a volumetric rendering of this intermediate 3-D model 1700 of the normalized glenoid vault morphology of the scapulae sample based on relatively complex 3-D model 1500 (seeFIG. 8 ). - At step 1800 (
FIG. 2 b), a simplified 3-D model 1820 (seeFIG. 10 ) of the average normalized glenoid vault morphology of the scapulae sample was constructed by selecting five equidistantly inferior-superior spaced-apart mutually parallel triangular cross sections (1840, 1860, 1880, 1900, 1920) (seeFIGS. 10 and 11 ) from intermediate 3-D model 1700 (seeFIG. 9 ). These triangular cross-sections were selected to account for more than 90% of the volume of intermediate 3-D model 1700 with almost negligible spatial deviation of the anterior and posterior walls. It should be appreciated that simplified 3-D model 1820 thus provides a concise geometrical model of the normalized glenoid vault morphology while substantially preserving the morphological nuances inherent to the endosteal walls 320 (seeFIG. 1 ). - A perspective view of this simplified 3-
D model 1820 of the average normalized glenoid vault morphology of the scapulae sample is shown inFIG. 10 .FIG. 11 shows a superior view of each of the triangular cross sections (1840, 1860, 1880, 1900, 1920) obtained from the simplified 3-D model 1820. As at least partially discernable fromFIGS. 10 and 11 ,cross section 1840 includes a generally medially positionedvertex 2000, a generally anteriorly and generally laterally positionedvertex 2020, and a generally posteriorly and generally laterally positionedvertex 2040. Similarly,cross section 1860 includes a generally medially positionedvertex 2060, a generally anteriorly and generally laterally positionedvertex 2080, and a generally posteriorly and generally laterally positionedvertex 2100.Cross section 1880 includes a generally medially positionedvertex 2120, a generally anteriorly and generally laterally positionedvertex 2140, and a generally posteriorly and generally laterally positionedvertex 2160. Thenext cross section 1900 includes a generally medially positionedvertex 2180, a generally anteriorly and generally laterally positionedvertex 2200, and a generally posteriorly and generally laterally positionedvertex 2220. Finally,cross section 1920 includes a generally medially positionedvertex 2240, a generally anteriorly and generally laterally positionedvertex 2260, and a generally posteriorly and generally laterally positionedvertex 2280. - Further,
cross section 1840 includes a “base”edge 2400 extending betweenvertex 2020 andvertex 2040,cross section 1860 includes a “base”edge 2420 extending betweenvertex 2080 andvertex 2100,cross section 1880 includes a “base”edge 2440 extending betweenvertex 2140 andvertex 2160,cross section 1900 includes a “base”edge 2460 extending betweenvertex 2200 andvertex 2220, andcross section 1920 includes a “base”edge 2680 extending betweenvertex 2240 andvertex 2280. - In addition,
cross section 1840 includes a “left”edge 2500 extending betweenvertex 2000 andvertex 2020,cross section 1860 includes a “left”edge 2520 extending betweenvertex 2060 andvertex 2080,cross section 1880 includes a “left”edge 2540 extending betweenvertex 2120 andvertex 2140,cross section 1900 includes a “left”edge 2560 extending betweenvertex 2180 andvertex 2200, andcross section 1920 includes a “left”edge 2580 extending betweenvertex 2240 andvertex 2260. - Finally,
cross section 1840 includes a “right”edge 2600 extending betweenvertex 2000 andvertex 2040,cross section 1860 includes a “right”edge 2620 extending betweenvertex 2060 andvertex 2100,cross section 1880 includes a “right”edge 2640 extending betweenvertex 2120 andvertex 2160,cross section 1900 includes a “right”edge 2660 extending betweenvertex 2180 andvertex 2220, andcross section 1920 includes a “right”edge 2480 extending betweenvertex 2260 andvertex 2280. - The respective base edges (2400, 2420, 2440, 2460, 2680) of the triangular cross sections (1840, 1860, 1880, 1900, 1920) define lateral boundaries of simplified 3-
D model 1820, corresponding to the region of the typical glenoid fossa 1160 (seeFIG. 3 ). Further, the respective left edges (2500, 2520, 2540, 2560, 2580) of triangular cross sections (1840, 1860, 1880, 1900, 1920) define anterior boundaries of simplified 3-D model 1820, while the respective “right” edges (2600, 2620, 2640, 2660, 2480) of triangular cross sections (1840, 1860, 1880, 1900, 1920) define posterior boundaries of simplified 3-D model 1820. The respective generally medially positioned vertexes (2000, 2060, 2120, 2180, 2260) of triangular cross sections (1840, 1860, 1880, 1900, 1920) sweep from a more posterior orientation at the inferior end of simplified 3-D model 1820 to a more anterior orientation at the superior end of simplified 3-D model 1820. - Each of the triangular cross sections (1840, 1860, 1880, 1900, 1920) has a respective width dimension (“w”) and a depth dimension (“d”). The table in
FIG. 12 summarizes the respective width dimension (“w”) (seeFIG. 11 ), depth dimension (“d”) (seeFIG. 11 ), and resulting area of triangular cross sections (1840, 1860, 1880, 1900, 1920). The table inFIG. 13 lists the coordinates for the respective vertexes of triangular cross sections (1840, 1860, 1880, 1900, 1920) relative to rectangular (“Cartesian”) coordinates reference system 1060 (seeFIG. 3 ). - It is contemplated that simplified 3-
D model 1820 may be rigidly scaled according to SI size (seeFIG. 4 ) to accommodate larger or smaller glenoid vaults while maintaining the integrity of the basic morphological model. - At step 3000 (
FIG. 2 c),stem 280 is initially fashioned in the shape of the simplified 3-D model 1820. In one embodiment, thisstep 3000 contemplates loading the coordinates of each of the vertexes defining the simplified 3-D geometrical model 1820 into a suitable stereo lithography system. The stereo lithography system may be operated to produce a corresponding 3-D form made of a plastic, wax, or any other suitable material as is known in the art. A mold is then prepared from the 3-D form and astem 280 is fashioned, such as by injection molding using this mold. In alternative embodiments stem 280 may be otherwise suitably produced in accordance with simplified 3-D model 1820 via stereo lithography, by hand, or by any other suitable method (with or without an intervening form or mold) as known. - In subsequent steps, the
stem 280 is machined to provide the features necessary to prepare the stem for implantation. Thus, at step 3020 (FIG. 2 c),socket 460 is bored intostem 280. At step 3040 (FIG. 2 c), through-channel 480 is bored (coaxially with socket 460) throughstem 280. It should be understood that the rough stem produced from the 3-D model may be machined according to other protocols depending upon the interface between thestem 280 and thebearing 220. It is further contemplated that thestem 280 may be formed as a solid or a hollow body and may further be provided with certain surface features to facilitate fixation of the stem within the glenoid vault. - The improved stem may then be implanted in accordance with known surgical procedures. For instance,
cancellous bone 340 may first be removed from the glenoid vault ofscapula 200 to constructcavity 300, which extends to endosteal walls 320 (seeFIG. 1 ).Stem 280 is then inserted intocavity 300 into intimate contact withendosteal walls 320 to facilitate alignment and reliable fixation ofglenoid component 120 withinscapula 200. Bone cement may be used to enhance fixation of the stem within the bone.Fastener 480 is inserted through through-channel 480 into engagement withscapula 200. Afterfastener 480 is fully inserted intoscapula 200,post 260 is inserted intosocket 460 and bearing 220 is secured to stem 280. - The foregoing description of the invention is illustrative only, and is not intended to limit the scope of the invention to the precise terms set forth. Further, although the invention has been described in detail with reference to certain illustrative embodiments, variations and modifications exist within the scope and spirit of the invention as described and defined in the following claims.
- For example, the glenoid components may be solid or hollow bodies. In particular, the
stem 280 may be formed as a solid implant, but may be preferably at least partially hollow to reduce the weight and material requirements for the component. If the implant component is hollow, it must have sufficient wall thickness to maintain its strength and integrity under maximum expected physiological loads. - The present invention contemplates a glenoid stem component that is formed to closely approximate a normalized glenoid vault morphology. In the embodiments discussed above, this normalized morphology is generated from a relatively large sample size of human scapulae from which relevant measurements were obtained. It was found that the normalized component dimensions obtained in accordance with the invention well approximated the actual dimensions of the sample population. In particular, it was found that at least 85% of the surface points of the sampled glenoid vaults varied by less than 2.0 mm, which represents a minimal variation given the overall dimensions of the endosteal walls of the vault.
- In generating the vault models for the different groups noted above, it was discovered that for the entire set of vault geometries, 98.5% of the surface points comprising the interior surface models varied by less than 2.0 mm. This finding refuted a prior assumption that vault morphology was dependent upon the global vault size. As a result, a single vault model was derived from the group models using the same steps described above. This final model is depicted in
FIG. 9 . From that model of the actual glenoid vault morphology for the entire sample population, the simplified geometric model was developed as described above. This simplified model was found to account for over 80% of the volume of the model of the actual sample population, while also preserving the morphological nuances inherent to the endosteal surfaces of the glenoid vault. - In one aspect of the invention, a morphological model is developed for several discrete groups of glenoid sizes. The groups may be preferably grouped by SI (superior-inferior) dimension, as summarized in the table of
FIG. 5 . The simplified model used to create the component mold in the illustrated embodiment corresponded toGroup 4, but it is understood that the simplified model for the other groups may be obtained by directly scaling the dimensions as a function of the ratio of SI values.
Claims (15)
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US16/240,177 US10918442B2 (en) | 2006-09-20 | 2019-01-04 | Glenoid component for shoulder arthroplasty |
US17/152,385 US20210196388A1 (en) | 2006-09-20 | 2021-01-19 | Method of Forming Glenoid Stem Component For Shoulder Arthroplasty |
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Also Published As
Publication number | Publication date |
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US10918442B2 (en) | 2021-02-16 |
US20190133691A1 (en) | 2019-05-09 |
JP5165314B2 (en) | 2013-03-21 |
AU2007216831B2 (en) | 2012-03-29 |
CN101156810A (en) | 2008-04-09 |
US7604665B2 (en) | 2009-10-20 |
US10182867B2 (en) | 2019-01-22 |
JP2008073526A (en) | 2008-04-03 |
US20150257848A1 (en) | 2015-09-17 |
US20210196388A1 (en) | 2021-07-01 |
ATE532485T1 (en) | 2011-11-15 |
AU2007216831A1 (en) | 2008-04-03 |
DK1902689T3 (en) | 2012-02-13 |
EP1902689A1 (en) | 2008-03-26 |
CN101156810B (en) | 2011-06-15 |
ES2373748T3 (en) | 2012-02-08 |
US20080140209A1 (en) | 2008-06-12 |
EP1902689B1 (en) | 2011-11-09 |
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