A Biomechanical Comparison of Volar Locked Plating of Intra-Articular Distal Radius Fractures: Use of 4 Versus 7 Screws for Distal Fixation

Moss DP, Means KR Jr, Parks BG, et al (Union Memorial Hosp, Baltimore, MD) J Hand Surg 36A:1907-1911, 2011^§

Abstract

Purpose

To determine whether the number of distal locking screws significantly affects stability of a cadaveric simulated distal radius fracture fixed with a volar locking plate.

Methods

We created AO/ASIF type C2 fractures in 10 matched pairs of human fresh-frozen cadaveric wrists and then fixed them using volar locking plates. The number of distal locking screws used was 4 screws or 7 screws in each wrist of the matched pair. We loaded the stabilized fractures cyclically to simulate 6 weeks of postoperative stressing during a therapy protocol and then loaded them to failure. Failure was defined as 2 mm or more of displacement of any fracture fragment as recorded by differential variable reluctance transducers.

Results

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