title: Extra-articular hip impingement: a narrative review of the literature.
abstract: There is growing subgroup of patients with poor outcomes after hip arthroscopy for intra-articular pathology suggesting unrecognized cause(s) of impingement may exist. Extra-articular hip impingement (EHI) is an emerging group of conditions that have been associated with intra-articular causes of impingement and may be an unrecognized source of pain. EHI is caused by abnormal contact between the extra-articular regions of the proximal femur and pelvis. This review discusses the most common forms for EHI including: central iliopsoas impingement, subspine impingement, ischiofemoral impingement, and greater trochanteric-pelvic impingement. The clinical presentation of each pathology will be discussed since EHI conditions share similar clinical features as the intra-articular pathology but also contain some unique characteristics.
authors.affiliation: Assistant Professor, Director Pre-Physical Therapy Program, Division of Kinesiology and Recreation, California State University Dominguez Hills.
authors.forename: Scott W
authors.initials: SW
authors.lastname: Cheatham
keywords: diagnosis; extra-articular; hip pain; impingement; review