[What becomes of the interposed capsule in Colonna's arthroplasty?]

A total hip replacement had to be performed 25 years after a Colonna arthroplasty. The acetabulum has been cut off for examination (articular cartilage and subchondral bone). The evolution of the case is detailed. Histological examination shows that the capsular tissue became articular cartilage, but not a normal one. This observation confirms that Colonna arthroplasty can give a good joint for more than 20 years but not longer.