Hip Arthroscopy in Patients With Acetabular Dysplasia: A Systematic Review of Clinical Outcomes at Long-term Follow-up.

BACKGROUND

Hip arthroscopy has shown satisfactory outcomes for the treatment of intra-articular pathology and femoroacetabular impingement syndrome (FAIS) in the setting of acetabular dysplasia at short- and mid-term follow-up. However, the long-term outcomes remain less understood.

PURPOSE: To systematically review the literature to determine patient-reported outcomes (PROs), clinically significant outcome (CSO) achievement, reoperation rates, and predictors of failure in patients with acetabular dysplasia undergoing hip arthroscopy at long-term follow-up.

STUDY

DESIGN

Systematic review; Level of evidence, 4.

METHODS

Three databases were searched around the following terms: hip arthroscopy, dysplasia, and long-term follow-up. Articles available in English, presenting original data, and reporting on a mean follow-up of ≥10 years after primary hip arthroscopy using either PROs, CSOs, or conversion to total hip arthroplasty (THA) and/or revision surgery were included. Quality assessment was completed using Methodological Index for Non-Randomized Studies (MINORS) assessment.

RESULTS

Five studies (555 hips) were included in the systematic review: patients had a mean age of 30 to 41 years, 13% to 88% of patients were female, and follow-up ranged from 9.6 to 12 years. MINORS assessment ranged from 11 to 21. All studies included PROs and reported statistically significant improvement for most PROs. The most frequent PRO was the Modified Harris Hip Score (mHHS) (n = 5). All studies reported CSO achievement, with mHHS and Hip Outcome Score-Sport Specific (HOS-SS) being the most common (n = 4). Revision surgery and conversion to THA ranged from 2.6% to 15.2% and from 2.6% to 23.7%, respectively across dysplasia cohorts. The most common definition of failure was conversion to THA, and Tönnis angle was the most common predictor of failure. Four studies made comparisons to a nondysplasia group, with 1 study finding inferior HOS-SS and inferior achievement of Patient Acceptable Symptom State across multiple PROs in the dysplasia group. All 4 comparative studies found no differences in rates of revision surgery or conversion to THA between groups.

CONCLUSION

Hip arthroscopy can reliably provide durable and clinically meaningful improvements for the treatment of intra-articular pathology and FAIS in patients with acetabular dysplasia at long-term follow-up, with comparable rates of revision surgery and conversion to THA to nondysplastic cohorts, although select dysplastic populations may demonstrate inferior patient-reported outcomes.