An acetabular cup assembly can include a cup portion and a bearing. The cup portion can include a porous metal outer layer having a first thickness and a solid titanium inner layer having a second thickness. A mating feature can be formed between the cup portion and the bearing. The bearing can be adapted...http://www.google.ca/patents/US20070173948?utm_source=gb-gplus-sharePatent US20070173948 - Porous metal cup with cobalt bearing surface
