Origin of the direct and reflected rectus femoris head
This study provides valuable insight into the relation of the AIIS and rectus tendon to the critical medial structures of the hip and pelvis, including the femoral neurovascular bundle. The data indicate that in most cases the femoral nerve is approximately 2 cm medial from the AIIS, and the pelvic cavity is encountered immediately medial to the AIIS.
This study also confirmed the author's hypothesis that the rectus femoris direct and reflected heads originate over a large area of the anterior and lateral pelvis and in close proximity to tendinous and neurovascular structures. The finding of a broad origin shows that a thorough knowledge of the anatomy of the proximal rectus femoris, and the femoral neurovascular bundle in particular, is valuable for any treatment of the anterior hip joint.
The average dimensions of the rectus femoris direct head footprint were 13.4 (medial-lateral) 26.0 mm (cranial-caudal). In contrast, the average dimensions of the reflected head footprint were 47.7 (anteriorposterior) 16.8 mm (cranial-caudal). The footprint was slightly smaller in the female specimens (direct,11.4 23.8 mm; reflected, 44.3 16.9 mm) than in the male specimens (direct, 14.4 27.1 mm; reflected, 49.4 16.8 mm).
> From: Ryan et al., J Arthrosc 30 (2015) 796-802. All rights reserved to The Arthroscopy Association of North America. Click here for the Pubmed summary.