Editorial Commentary: Ischiofemoral Impingement: Is This the "New" Femoroacetabular Impingement?

In a single-surgeon study of more than 1,000 hip operations, 30 patients were identified with possible ischiofemoral impingement (IFI). Only 17 of these 30 (56.6%) patients ultimately were diagnosed as having IFI on the basis of magnetic resonance imaging, injections, arthroscopy, and the 2 clinical tests described. The IFI test and the long-stride walking test were both highly accurate for the purported diagnosis; however, the most accurate test that was not specifically prospectively studied was quadriceps muscle edema on magnetic resonance imaging, which was present only in otherwise confirmed cases of IFI and not seen with any other diagnosis.