Abstract
A patient with a painful total hip replacement that is not obviously loose presents a diagnostic challenge. One of the rare causes is psoas impingement syndrome. Because there are several periarticular muscles, further muscle impingements are possible. We report on a case of painful obturator externus muscle impingement on the acetabular cup. On magnetic resonance imaging, a pathologic contact between the obturator externus muscle and the caudal rim of the cup was seen. A positive injection confirmed the pathologic contact.
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