Acetabular Rim Ossification Variants Are Found in Almost 20% of Patients Presenting With Hip Pain

PurposeThe purposes of this study are to determine the prevalence 4 different types acetabular rim ossifications, including partial labral ossification or punctate calcification, true os acetabuli, stress fracture, and complete ossification, whether periacetabular ossifications linked demographic radiological factors.MethodsWe retrospectively reviewed medial records patients presenting for hip-related complaints at 2 sports medicine practices from September 2007 December 2009. An anteroposterior radiograph both hips a lateral each hip was obtained all findings cam pincer femoroacetabular impingement, degenerative changes (Tönnis grade), calcifications hips. These parameters were also evaluated with respect symptoms, sex, age.ResultsFour hundred ninety-one consecutive (982 hips) presented orthopaedic surgeons centers “hip”-related complaints. There 223 males 268 females (age 39 ± 14 years). The overall in 17.6%, 56.6% symptomatic 43.4% contralateral hip. Four basic patterns calcification identified: punctuate within labrum (8.0% hips), large rounded (os acetabuli) (4.2% hip), fragments vertical line superior-lateral rim, consistent healed non-healed fracture (2.0% (3.4% hips). Overall, male sex (P = .002), increased center-edge angle .046), higher Tönnis grade < .001) statistically predicted presence ossification. Punctate more prevalent .002). Higher .029) alpha .046) acetabuli. Younger age .001), .048), .012), fractures. No factors significant predicting an ossified labrum.ConclusionPeriacetabular not uncommon. particular (8%), larger (i.e., (4.2%), fractures (2%), (3.4%) combined 17.6% surgeon Nearly half asymptomatic Male had calcifications. center edge likely have Patients acetabuli fractures.Level EvidenceThis aims identify, quantify, categorize about Their clinical relationships relevance been discussed, but no has distinctly categorized various their prevalence. This provides framework identification categorization. factors. We age. labrum. Periacetabular