The Kapandji technique for fixation of distal radius fractures--a biomechanical comparison of primary stability.
The goal of this study was to compare Kapandji-K-wiring and established K-wiring techniques of the distal radius fracture for primary stability in a biomechanical model: dorsal K-wiring according to Kapandji using different angles of the K-wire, parallel and diagonal alignment of the K-wires. A new testing system which uses a synthetic material enabled us to carry out the cantilever bending test. By application of a lower load, the Kapandji procedure shows a higher reactive torque and stiffness. A higher reaction force of the other techniques, especially of the parallel wiring, are only observable under high-grade bending stress. Application of the Kapandji procedure with K-wires at a smaller angle to the axis of the radius results in the highest primary stability of the procedures investigated in the essential range of initial deformation.
Klinik für Orthopädie und Sportorthopädie, Technische Universität München, Ismaninger Str. 22, 80809 München, Germany. wmpriv@aol.com
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Mittelmeier
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Braun
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Schäfer
D001696:Biomechanical Phenomena; D001864:Bone Wires; D005593:Fracture Fixation, Internal / Q000295:instrumentation / Q000379:methods*; D006801:Humans; D007593:Joint Instability / Q000517:prevention & control*; D008953:Models, Anatomic; D011885:Radius Fractures / Q000503:physiopathology / Q000601:surgery*; D016059:Range of Motion, Articular; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014954:Wrist Injuries / Q000503:physiopathology / Q000601:surgery