Fig. 4From: Risk factors for iliopsoas impingement after total hip arthroplasty using a collared femoral prosthesisIntraoperative photo demonstrating potential impingement between the collar (white arrowhead) and iliopsoas tendon (black star) during stem implantation. Note that the metal collar was overhanging the calcar (white arrow) even if the stem had not been fully seated yet into the canalBack to article page