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Femoroacetabular impingement (FAI) Gaining Acceptance as a Treatable Cause of Groin and Hip Pain in Young, Active Adults

Scott Lynch, M.D.

Scott Lynch, M.D.

When a young, active adult presents with chronic groin or hip pain, in the absence of frank intra-articular hip joint damage or other identifiable cause, conventional approaches to treatment focus on conservative management (physical therapy, massage, changes to their daily routine, or anti-inflammatory medication). In recent years, however, femoroacetabular impingement (FAI) has been gaining acceptance as a treatable source of the pain. Scott Lynch, M.D., orthopaedic surgeon and director of orthopaedic sports medicine, Penn State Hershey Bone and Joint Institute, explains, “There are two types of FAI: cam and pincer. In the cam type, which is more common in men, there is a bony deformity of the femoral head; in the pincer type, more common in women, there is an overgrowth or malorientation of the acetabulum.” Many active adults with FAI experienced relief of groin pain after surgery aimed at correcting the underlying joint malformations.

Although FAI is becoming more widely recognized as a pathologic deformity of the hip, standards for assessment and treatment have not been defined. While surgical intervention remains controversial because, as Lynch explains, “large scale epidemiological studies with a control population showing a clear link between FAI, pain, and osteoarthritis are lacking,” clinical experience, nevertheless, is convincing. Lynch, who has performed more than 150 hip arthroscopies, says, “Careful patient selection is the key to identifying patients with groin pain and underlying FAI. Eighty percent of the information needed for accurate FAI diagnosis can be obtained from patient history and physical examination.” For patients with lateral, trochanteric, or bursal pain, FAI can most likely be ruled out. Pain upon flexion and internal rotation of the hip, however, may indicate intra-articular hip joint pathology, and should trigger further investigations. Conventional X-rays are important but can yield misleading information if not done correctly.

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