Long-term follow-up studies of total hip arthroplasty.

Long-term follow-up studies of cemented total hip arthroplasty (THA) are restricted to a few successful designs. The most studied design, the Charnley THA, has demonstrated excellent, though not perfect, survivorship at long-term follow-up in most studies. Patient-related factors including age, gender, and patient diagnosis, affect implant survivorship.