Femoroacetabular impingement


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The femoroacetabular impingement (FAI) is a disorder caused by an abnormal contact between the femoral head and the acetabulum during the articular excursion. This dysfunction has recently been recognized as a cause of early osteoarthritis in young patients.
Three types of impingements mechanisms are distinguished:
  • Cam, caused by an anomaly in correspondence with the morphology of the head-neck junction of the femur, it is observed more frequently in young males and athletes, with an average age of 30 years;
  • Pincer, caused by an anomaly of orientation or depth of the acetabulum, it is observed more frequently in middle-aged female subjects;
  • Mixed, caused by the presence of both anomalies, Cam and Pincer.
The different mechanisms of the impingement correspond to different damages to the acetabular labrum and articular cartilage.
The recognition of these mechanisms of joint damage is important in preventing early degeneration of the joint.

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Chirurgia dell’anca a Piacenza