Hip dysplasia is usually associated with poorer clinical results and is a poor prognostic factor for the future of the joint. A new study has nevertheless provided fresh information about patients who have borderline dysplasia and undergo hip arthroscopy for femoroacetabular impingement.
The purpose of the study was to compare hip survivorship and to assess patient-reported outcomes after primary hip arthroscopy for femoroacetabular impingement in patients with borderline dysplasia, and to compare the results with a group of patients without dysplasia.
This was a retrospective study of patients operated on by a single surgeon between 2010 and 2009. Borderline dysplasia was defined as a lateral centre-edge angle (LCEA) of 20° to 25°. The patients were compared with other patients in the control group, and age, sex, body mass index and the preoperative Modified Harris Hip Score were assessed. The alpha angle, the centre-edge angle, the Tonnis angle and acetabular retroversion were also assessed on preoperative and postoperative radiographs. The outcome scores included the Modified Harris Hip Score and the Non-Arthritic Hip Score. The results were evaluated by statistical analysis.
31 patients with borderline dysplasia (mean age 36.8 years, 71% women) and 62 from the control group (mean age 38 years, 71% women) were included in the study. There were no significant differences in the demographic data between the two patients, nor in the radiological measurements. Patients with borderline dysplasia had lower-grade tears of the labrum, but the differences were not statistically significant. Postoperatively there were no statistically significant differences in the rate of revision arthroscopy or of conversion to total hip arthroplasty. Similar results were seen at two years for both the Modified Harris Hip Score and the Non-Arthritic Hip Score.
The authors concluded that borderline dysplasia is not associated with a significant difference in hip survivorship or in the outcome scores after primary hip arthroscopy performed for femoroacetabular impingement.
Source: “Arthroscopy”, April 2024