The rarely encountered rim fracture that contributes to both femoroacetabular impingement and hip stability: a report of 2 cases of arthroscopic partial excision and internal fixation.

Abstract

Femoroacetabular impingement (FAI) can be associated with labral ossification, acetabular rim fractures, and os acetabuli. Typically, these fragments can be completely excised as part of a femoroacetabular impingement correction procedure. In rare instances, however, larger, weight-bearing fragments contribute to pincer-type impingement, but complete removal might create structural instability or dysplasia. We report the results of 2 such cases where partial resection of a rim fracture and internal fixation of the remaining fragment were performed to correct the impingement while preserving adequate acetabular coverage. Predictable pain relief, healing of the stabilized rim fragment, and improved outcome scoring were achieved in both cases at 2-year follow-up evaluation.