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J Hand Surg Eur Vol ; 36(7): 560-7, 2011 Sep.
Article in English | MEDLINE | ID: mdl-21636620

ABSTRACT

Clinical results following four-corner arthrodesis vary and suggest that nonunion may be related to certain fixation techniques. The purpose of our study was to examine the displacement between the lunate and capitate following a simulated four-corner arthrodesis with the hypothesis that three types of fixation (Kirschner wires, dorsal circular plate, and a locked dorsal circular plate) would allow different amounts of displacement during simulated wrist flexion and extension. Cadaver wrists with simulated four-corner arthrodeses were loaded cyclically either to implant failure or until the lunocapitate displacement exceeded 1 mm. The locked dorsal circular plate group was significantly more stable than the dorsal circular plate and K-wire groups (p = 0.018 and p = 0.006). While these locked dorsal circular plates appear to be very stable our results are limited only to the biomechanical behavior of these fixation techniques within a cadaver model.


Subject(s)
Arthrodesis/methods , Osteoarthritis/surgery , Wrist Joint/surgery , Aged , Arthrodesis/instrumentation , Biomechanical Phenomena , Bone Plates , Bone Wires , Cadaver , Equipment Failure Analysis , Female , Humans , Male , Surgical Stapling , Tensile Strength
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