Thursday, August 8, 2013

Subspine (AIIS) Impingement - A 'New' Form of Impingement Next to the Hip Joint

By now femoroacetabular impingement (FAI), hip impingement, is well documented in the literature, although far from all orthopedic surgeons are qualified to diagnose and treat hip impingement. But a ‘new’ form of impingement, called subspine or AIIS (anterior inferior iliac spine) impingement is a diagnosis that is increasingly recognized.

Why is this important? Because in patients who have femoroacetabular impingement (high alpha angle and/or version), type II and type III shapes of the AIIS are associated with a decrease in hip flexion and internal rotation.