Biomechanical comparison of two fixation methods for first metatarsophalangeal joint arthrodesis |
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| Authors: | Molloy Sean Burkhart Bradd G Jasper Louis E Solan Matthew C Campbell John T Belkoff Stephen M |
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| Affiliation: | Orthopaedic Instrumentation Laboratory, Dept. of Orthopaedic Surgery, Johns Hopkins University, Johns Hopkins Bayview Medical Center, Baltimore, MD 21224-2780, USA. |
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| Abstract: | PURPOSE: The aim of this study was to compare the mechanical stability of two methods of fixation for arthrodesis of the hallux metatarsophalangeal joint: 1. a technique using an intramedullary screw and 2. a standard technique using crossed interfragmentary compression screws. METHODOLOGY: The metatarsophalangeal joint was mechanically evaluated in cantilever bending using a servohydraulic testing machine. Differences in stiffness and strength parameters between the two techniques were checked for significance (P<0.05) using a paired t-test. RESULTS: Fixation provided by the intramedullary screw was stiffer and stronger than that from crossed compression screws. CONCLUSIONS: The stronger and stiffer intramedullary screw technique offers mechanical advantages over the crossed interfragmentary screw technique. |
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