Surgical treatment of femoroacetabular impingement: Evaluation of the effect of the size of the resection

Rodrigo M. Mardones, Carlos Gonzalez, Qingshan Chen, Mark Zobitz, Kenton R. Kaufman, Robert T. Trousdale

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Abstract

Background: In patients with symptomatic hip impingement, surgical resection of the femoral head-neck junction may improve the range of motion and relieve pain. A risk of this procedure is fracture. We evaluated the amount of resection of the anterolateral aspect of the femoral head-neck junction that can be done safely. Methods: Cadaveric proximal femoral specimens (fifteen matched pairs) were divided into three groups: 10%, 30%, or 50% of the diameter of one femoral neck was removed, and the contralateral femoral neck was left intact to serve as the control. A compressive load was applied directly to the femoral head. Peak load, stiffness, and energy to fracture were compared among the groups. Results: The energy to fracture differed significantly (p = 0.0015) among the 10%, 30%, and 50% resection groups. The peak load after the 50% resection was significantly less (p = 0.0025) than that after the 10% or 30% resection. With the numbers available, there was no significant difference in peak load between the 10% and 30% resections. Conclusions: Resection of up to 30% of the anterolateral quadrant of the head-neck junction did not significantly alter the load-bearing capacity of the proximal part of the femur. However, a 30% resection significantly decreased the amount of energy required to produce a fracture. Thirty percent should be considered to be the greatest feasible amount of resection because of the change in the pattern of the femoral head-neck response to axial loads that we observed.

Original languageEnglish (US)
Pages (from-to)273-279
Number of pages7
JournalJournal of Bone and Joint Surgery - Series A
Volume87
Issue number2
DOIs
StatePublished - Feb 1 2005

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ASJC Scopus subject areas

  • Surgery
  • Orthopedics and Sports Medicine

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