The Journal of Arthroplasty
Volume 26, Issue 6, Supplement , Pages 59-65, September 2011

The Cam Impinging Femur Has Multiple Morphologic Abnormalities

  • Andrew R. Ellis, BA

      Affiliations

    • Baylor College of Medicine, Houston, Texas
    • ,
  • Philip C. Noble, PhD

      Affiliations

    • Baylor College of Medicine, Houston, Texas
    • The Institute of Orthopedic Research and Education, Houston, Texas
    • Corresponding Author InformationReprint requests: Philip C. Noble, PhD, Professor of Orthopedic Surgery, Baylor College of Medicine, Director of Research, Institute of Orthopedic Research and Education, 6550 Fannin St. – Suite 2501, Houston, TX 77030.
    • ,
  • Steven J. Schroder, BS

      Affiliations

    • Baylor College of Medicine, Houston, Texas
    • ,
  • Matthew T. Thompson, MS

      Affiliations

    • The Institute of Orthopedic Research and Education, Houston, Texas
    • ,
  • Gregory W. Stocks, MD

      Affiliations

    • Fondren Orthopedic Group, Houston, Texas

Received 13 July 2010; accepted 18 April 2011.

Abstract 

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, α angle of Notzli, β angle of Beaulé, 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.

Keywords: cam impinging femur, morphologic abnormalities, head-neck junction

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 The Conflict of Interest statement associated with this article can be found at doi:10.1016/j.arth.2011.04.028.

 The work was performed at the Institute of Orthopedic Research and Education, Houston, Texas.

PII: S0883-5403(11)00212-9

doi:10.1016/j.arth.2011.04.028

The Journal of Arthroplasty
Volume 26, Issue 6, Supplement , Pages 59-65, September 2011

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