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Original article| Volume 45, ISSUE 1, P13-19, January 2006

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Analysis of Three Types of Fixation of the Weil Osteotomy

  • Author Footnotes
    1 Submitted while third-year surgical resident, St. John North Shores Podiatric Surgical Residency Program, Harrison Township, MI
    Craig T. Jex
    Footnotes
    1 Submitted while third-year surgical resident, St. John North Shores Podiatric Surgical Residency Program, Harrison Township, MI
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  • Author Footnotes
    2 Submitted while second-year surgical resident, St. John North Shores Podiatric Surgical Residency Program, Harrison Township, MI
    Chanda J. Wan
    Correspondence
    Address correspondence to: Chanda J. Wan, DPM, 117 North Braddock St #150, Winchester, VA 22601
    Footnotes
    2 Submitted while second-year surgical resident, St. John North Shores Podiatric Surgical Residency Program, Harrison Township, MI
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  • Author Footnotes
    3 Submitted while Graduate Student, College of Engineering, Michigan State University, East Lansing, MI
    Steve Rundell
    Footnotes
    3 Submitted while Graduate Student, College of Engineering, Michigan State University, East Lansing, MI
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  • Author Footnotes
    4 Director, Orthopedic Biomechanics Laboratories, Michigan State University, East Lansing, MI
    Roger C. Haut
    Footnotes
    4 Director, Orthopedic Biomechanics Laboratories, Michigan State University, East Lansing, MI
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  • Author Footnotes
    5 Chief, Department of Podiatric Surgery, St. John North Shores Hospital, Harrison Township, MI
    Brian MacDonald
    Footnotes
    5 Chief, Department of Podiatric Surgery, St. John North Shores Hospital, Harrison Township, MI
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  • Author Footnotes
    6 Residency Director, St. John North Shores Hospital, Harrison Township, MI
    Stuart J. Wertheimer
    Footnotes
    6 Residency Director, St. John North Shores Hospital, Harrison Township, MI
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  • Author Footnotes
    1 Submitted while third-year surgical resident, St. John North Shores Podiatric Surgical Residency Program, Harrison Township, MI
    2 Submitted while second-year surgical resident, St. John North Shores Podiatric Surgical Residency Program, Harrison Township, MI
    3 Submitted while Graduate Student, College of Engineering, Michigan State University, East Lansing, MI
    4 Director, Orthopedic Biomechanics Laboratories, Michigan State University, East Lansing, MI
    5 Chief, Department of Podiatric Surgery, St. John North Shores Hospital, Harrison Township, MI
    6 Residency Director, St. John North Shores Hospital, Harrison Township, MI
      This study assessed 3 methods of fixation for the Weil osteotomy. A total of 40 bone models were divided equally into 4 groups: a control group consisting of intact lesser rays; and Weil osteotomies that were fixated with 2 crossed Kirschner wires (0.045-in K-wires), 2.0-mm cortical screws, or cannulated 2.4-mm cortical screws. Each specimen was stressed in a computer-controlled hydraulic tensile testing machine, and maximum load, energy to failure, and stiffness were recorded. The following mean load to failure measurements were found: control, 62.9 Newtons (N); K-wire, 22.9 N; cannulated screw, 31.3 N; and noncannulated screw, 19.9 N. There was no statistical difference among the 3 groups of fixation methods in terms of the maximum load. The mean energy to failure of the control group was 326 joule (J); K-wire, 79 J; cannulated screw, 163 J; and noncannulated screw, 66 J. The cannulated screw generated a statistically greater amount of energy at failure than the noncannulated screw (P < .05). The mean structural stiffness of the control group was 7.3 N/mm; K-wire, 2.8 N/mm; cannulated screw 3.3 N/mm; and noncannulated screw, 3.2 N/mm. There was no statistical difference in structural stiffness among the 3 groups of fixation methods. The results indicated a trend toward better biomechanical stability with the 2.4-mm cannulated screw than the 2.0-mm noncannulated screw for fixation of the Weil osteotomy.

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