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  • Title: Femoral component positioning in resurfacing arthroplasty--effects on cortical strains.
    Author: Kummer FJ, Pereira G, Schachter AK, Jaffe WL.
    Journal: Bull NYU Hosp Jt Dis; 2009; 67(4):341-6. PubMed ID: 20001936.
    Abstract:
    Previous studies have suggested that femoral component positioning in resurfacing arthroplasty may affect strains in the femoral neck that could lead to decreased implant longevity. A strain gaged, Sawbones model was used to determine the femoral neck strains for a variety of resurfacing head translations and angulations. We found that head positions affected strain distributions, most positions leading to increased neck strains, often over 100%, with the exception being a varus head position where the superior neck strains decreased over 50%. Although the clinical meaning of these findings is unclear, it could be of concern for stress-shielding or fatigue fracture of the femoral neck.
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