![]() ![]() All patients who answered positively to any of the questions were excluded. All patients agreeing to participate in the study were asked to fill out a questionnaire enquiring about any current or past hip/groin pain, medical/surgical hip joint history, and history of hip trauma or history of hip problems during childhood. Over a 3-month period, adult patients who underwent thoraco-abdomino-pelvic CT for suspected thoracic, abdominal, or urogenital pathology were prospectively included. Informed consent was obtained from all patients. This study was approved by the ethical committee of the institution where the data was acquired. We further aimed to determine whether the presence of ARO is associated with patient-related (sex, age, BMI) or hip-related parameters (joint space width (JSW) and imaging parameters of FAI morphology). In this study, we aimed to estimate the prevalence of ARO in the adult population with asymptomatic, morphologically normal hips, using computed tomography (CT). Overall, the literature on ARO is limited, in particular in the healthy population, and their characteristics and origin not fully understood. While ARO have been described by some authors as variants that may mimic marginal acetabular osteophytes that can falsely lead to the diagnosis of hip joint osteoarthritis, others have hypothesized that ARO may be the cause or the consequence of femoroacetabular impingement (FAI). The interpretation of these ossifications is also largely debated. At histology, a few studies have attempted to determine the origin of these ossifications, but the topic remains debated. While some authors believe that these ossifications correspond to an early stage of the formation of acetabular osteophytes, others describe a phenomenon distinct from osteophyte formation, either by endochondral ossification of the labrum or by appositional bone formation in the subperiosteal part of the acetabular rim, which displaces and replaces the labrum. At cross-sectional imaging, ARO are found at the attachment site of the labrum onto the acetabular rim and larger ossifications tend to have the same triangular shape as the labrum. While marginal osteophytes are classically found at this location, some authors have advocated that these ossifications may correspond to ossifications of the acetabular labrum, based on imaging and histological analyses. The origin of these acetabular rim ossifications (ARO) is unclear. In clinical practice, ossifications adjoining the acetabular rim are frequently seen in otherwise healthy-appearing hip joints, at all ages.
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