Short-Term Results of Novel Constrained Total Hip Arthroplasty

• Published in: Orthopedic Reviews Vol. 7; no. 2; p. 5779
• Main Authors: Pace, Thomas, Finley, Stephen, Snider, Rebecca, Looper, Jayme, Tanner, Stephanie
• Format: Journal Article
• Language: English
• Published: Italy PAGEPress Publications 15-06-2015; PAGEPress Publications, Pavia, Italy; Open Medical Publishing
• Subjects: Arthroplasty; instability; Joint replacement surgery; Joint surgery; osteoarthritis; Pain; Prostheses; nstability; osteoarthritis; Arthroplasty
• ISSN: 2035-8237; 2035-8164; 2035-8164
• DOI: 10.4081/or.2015.5779

Constrained acetabular components have only been recommended as a salvage option for the persistently unstable total hip arthroplasty (THA), due to limited range of motion and less than satisfactory component failure rates. This is a retrospective review of 137 patients with 154 consecutive primary constrained THAs performed between November 2003 and August 2007. We reviewed serial radiographs, postoperative complications, groin/thigh pain, and compared preoperative and postoperative Harris Hip Scores. With a mean follow-up of 6 years, there was 1.9% dislocation rate, 0% component failure rate, and 2.6% infection rate. Seven patients reported continued groin pain, and three had continued thigh pain. One patient showed radiographic evidence of 1 mm polyethylene wear. Radiographic review showed no evidence of osteolysis or stem subsidence. Harris Hip Scores improved from a mean of 68.8 (range 58-87) preoperatively to 98.9 (range 65-100) at final clinical assessment. This constrained acetabular prosthesis had a dislocation rate of less than 2%, with 0% component failure rate at a minimum of 2 years of follow-up suggesting this prosthesis may be a viable alternative for patients at risk for instability or those known to have recurrent instability.