Femoroacetabular Impingement

By Kevin M. Kaplan, MD

Dr. Kevin Kaplan, Orthopaedic Surgeon at JOI San Marco, explains the condition of Femoroacetabular Impingement of the hip.

Femoroacetabular Impingement

The concept of femoroacetabular impingement was first introduced in 1975 by Dr. Stulberg who noted abnormalities in the femoral neck and acetabulum. Later studies by Dr. Demairis recognized subtle anatomic abnormalities in athletes with hip pain. Dr. Ganz furthered these findings by defining these structural abnormalities and helped orthopaedic surgeons understand the idea of femoroacetabular impingement.

The definition of femoroacetabular impingement is an abutment conflict between the bone of the femoral neck and that of the acetabulum. Typically, patients have a combination of Cam impingement (osseous prominence on the femoral neck) and Pincer impingement (overcoverage or abnormal morphology of the acetabulum), both of which are observable findings on radiographic examinations. As has been demonstrated in cadaveric studies, the labrum (cartilage around the acetabulum) anterosuperiorly is subject to high strain even in moderate amounts of flexion and extension. The aforementioned abnormalities can increase this strain and provide a mechanical explanation as to the cause of labral tears and cartilage injuries. The labrum serves as a shock absorber and allows proper joint lubrication. Recent studies have found an association between acetabular labral tears and the early onset of osteoarthritis.

Anatomy of the Hip

Anatomy of the Hip


Thus, treatement of labral tears and femoroacetabular impingement is crucial for hip preservation. Additionally, histologic analysis has demonstrated nerve endings in the labrum, which inaddition to the bony impingement and inflammation in the hip joint represents evidence explaining the pain that these patients experience. The diagnosis of labral tears in the hip, once thought to be an uncommon injury, has been increasing in frequency because of improvements in diagnostic imaging and clinical examination. With the increased recognition of these pathological processes and the knowledge of the potential consequent hip degeneration, treatment is paramount to patient success with the goal of preventing or prolonging the need for joint replacement.

Open surgical dislocation has given way to the minimally invasive arthroscopic approach, with studies demonstrating similar clinical outcomes between the two techniques. However, the arthroscopic procedures have a much lower morbidity, can be performed on an outpatient basis, and are associated with a much quicker return to activities of daily living. The logistics of the hip joint make the procedure much more complex than shoulder and knee arthroscopy. The joint itself is in a deeper location. Outcome studies have demonstrated encouraging results after arthroscopic repair. Clohisy and McClure found that the majority of their patients had resolution of their symptoms by 1 year. McCarthy et al followed a cohort of 10 athletes with 80% excellent results at an average of 23.6 months follow up. Byrd et al had similar results that were maintained for 5 years post operative.

Dr. Kevin Kaplan discusses Femoroacetabular Impingement.

3D Illustration of Hip

Are you suffering from hip issues, joint pain, or injuries resulting from any type of activity? Seek out the advice of an Hip Orthopaedic Specialist.

Also, are you interested in scheduling an appointment with an Hip Orthopedic Specialist? Please call JOI-2000 or follow the link below.


All JOI Physicians, Physical Therapists and Occupational Therapists now offer Telemedicine services. These are virtual visits from the convenience of your home. Furthermore, if you feel that it is best to stay in your own home during this time, we can still provide orthopaedic Telehealth services for you. Through the download of the free Zoom app on the your phone, tablet or laptop. Also, our physicians and Telehealth for Physical Therapy can evaluate you and provide the care you need.

JOI Fracture and Injury Care

JOI Physicians are currently offering ASAP Fracture care. Make an appointment by calling (904)JOI-2000. This is a new option for patients who would like to avoid the emergency room if they have suffered a fracture or soft tissue injury. Also, to learn more about this service, read this article about fracture and injury care.

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