What are the risk factors for revision hip arthroscopy in femoroacetabular impingement at seven-year follow-up?

In recent years the surgical treatment of symptomatic femoroacetabular impingement has increasingly been carried out by the arthroscopic method. Both the bony pathomorphologies and lesions of the labrum and of the articular cartilage can be treated with results comparable to those of the open technique, but with fewer complications.
The aim of this study was to establish the clinical and radiographic results after seven years of follow-up, to calculate seven-year survival using as endpoints total hip arthroplasty, any progression of osteoarthritis and a poor clinical result, and to identify factors associated with revision arthroscopy.
Between 2003 and 2008, 62 hip arthroscopies were performed for femoroacetabular impingement. For the same indication, 571 open procedures with surgical dislocation of the hip were also performed. The treatment consisted of correction of cam-type or pincer-type femoroacetabular impingement, or both, and treatment of any damage to the labrum and to the articular cartilage of the acetabulum.
The authors concluded that in this series of patients treated arthroscopically for femoroacetabular impingement, hip arthroscopy resulted in an intact hip joint with no progression of osteoarthritis at seven-year follow-up. The risk factors for revision hip arthroscopy were increased coverage of the femoral head by the acetabulum and the presence of a pistol grip deformity.
Source: Haefeli PC, Albers CE, Steppacher SD, Tannast M, Büchler L. What Are the Risk Factors for Revision Surgery After Hip Arthroscopy for Femoroacetabular Impingement at 7-year Followup? Clin Orthop Relat Res. 2017 Apr;475(4):1169-1177.