Anterior and posterior hip osteoarthritis: prevalence and potential value of CT compared to radiographs

To determine the added value of computed tomography (CT) to identify severe hip osteoarthritis (OA). A retrospective query of all cases of hip or knee arthroplasty planning CTs between January 2018 and March 2022 was performed. Age, sex, and symptoms were collected from the medical record. CTs were evaluated for the degree of osteoarthritis and classified using an adapted Kellgren-Lawrence (KL) grading system in the anterior, posterior, superior, and superomedial hip. Frontal hip or pelvis radiographs within 1 year of the CT were also graded. There were 265 eligible hips in 178 subjects, age 66 ± 11 (range 31–93) years, with 85/178 (48