The Cam Impinging Femur Has Multiple Morphologic Abnormalities

作者：Ellis Andrew R; Noble Philip C^*; Schroder Steven J; Thompson Matthew T; Stocks Gregory W

来源：Journal of Arthroplasty, 2011, 26(6): 59-65.

DOI：10.1016/j.arth.2011.04.028

• cam impinging femur
• morphologic abnormalities
• head-neck junction

This study was performed to establish whether the "cam" impinging femur has a single deformity of the head-neck junction or multiple abnormalities. Average dimensions (anteversion angle, alpha angle of Notzli, beta angle of Beau le, normalized anterior head offset) were compared between normal and impinging femora. The results demonstrated that impinging femora had wider necks, larger heads, and decreased head-neck ratios. There was no difference in neck-shaft angle or anteversion angle. Forty-six percent of impinging femora had significant posterior head displacement (>2mm), which averaged 1.93 mm for the cam impinging group, and 0.78 mm for the normal group. In conclusion, surgical treatment limited to localized recontouring of the head-neck profile may fail to address significant components of the underlying abnormality.

• 出版日期2011-9