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In (a) high-kick dance, (b) gymnastics, and some ballet positions, impingement occurs between the anterior-inferior iliac spine (AIIS) and distal femoral neck, as can be seen in this (c) 3-dimensional computer simulation of high-flexion impingement. Figure (a) reprinted with permission, http://www.shutterstock.com. Figure (c) reprinted with permission from Larson et al.58
