Hip resurfacing arthroplasty as an alternative to total hip arthroplasty in patients aged under 40 years A RETROSPECTIVE ANALYSIS OF 267 HIPS

Aims The aims of the study were to report for a cohort aged younger than 40 years: 1) indications for HRA; 2) patient-reported outcomes in terms of the modified Harris Hip Score (HHS); 3) dislocation rate; and 4) revision rate.Methods This retrospective analysis identified 267 hips from 224 patients who underwent an hip re-surfacing arthroplasty (HRA) from a single fellowship-trained surgeon using the direct lateral approach between 2007 and 2019. Inclusion criteria was minimum two -year follow -up, and age younger than 40 years. Patients were followed using a prospectively maintained institutional database.Results A total of 217 hips (81%) were included for follow -up analysis at a mean of 3.8 years. Of the 23 females who underwent HRA, none were revised, and the median head size was 46 mm (compared to 50 mm for males). The most common indication for HRA was femoroacetabu-lar impingement syndrome (n = 133), and avascular necrosis ( (n = 53). Mean postoperative HHS was 100 at two and five years. No dislocations occurred. A total of four hips (1.8%) required reoperation for resection of heterotopic ossification, removal of components for infection, and subsidence with loosening. The overall revision rate was 0.9%.Conclusion For younger patients with higher functional expectations and increased lifetime risk for re-vision, HRA is an excellent bone preserving intervention carrying low complication rates, revision rates, and excellent patient outcomes without lifetime restrictions allowing these patients to return to activity and sport. Thus, in younger male patients with end -stage hip disease and higher demands, referral to a high-volume HRA surgeon should be considered.