Analysis of the accuracy of fit of five anatomically precontoured clavicle plate systems

Abstract

Acommon method in surgical treatment of midshaft clavicular fractures is the clavicle plating system. In addition to traditional osteosynthetic devices, anatomically preformed plate systems also exist. Advantages are described in greater accuracy of fit and less irritation of surrounding soft tissues. The purpose of this study was to compare the anatomical fit of five different precontoured clavicle plating systems. The anatomical fit of five different types of anatomical precontoured clavicle plates, 3 timesVariaxSystem® (Stryker, Kalamazoo, MI), Meves® Plate (Ulrich medical Ulm, Germany) and LCP clavicle plate (Synthes, Bettlach, Switzerland) were investigated in 20embalmed human cadaveric clavicles. An imprint of the space between the well-positioned plate and the clavicle was obtained using asilicone mass and the silicone imprint was digitally measured. Additionally, the anatomical fit was evaluated by three investigators following astandardized protocol (+2 to -2points at lateral, midshaft and medial clavicle portions). The first three ranks went to the Stryker Variax-plates. They showed the least distance (Stryker 628027: 7‑hole 1.44 mm, low curvature 0.93 mm-2.36 mm, 2. Stryker 628028: 8‑hole low curvature 1.68 mm, 1.03 mm-2.4 mm and 3. Stryker 628128: 8‑hole high curvature 1.87 mm, range 1.09 mm-3.1 mm) The evaluation of the anatomical fit by the investigators was in agreement with the measurement results. Although there was no complete congruency between the plates and the clavicle, all clavicle plates investigated in this study presented areasonable anatomical shape. The 7‑hole VariAx Stryker plate with slight curvature showed the best anatomical fit. Alow profile and optimized anatomical precontouring can minimize irritation of the surrounding soft tissues and should be considered in plate design and implant choice.