An In Vitro Evaluation of Plate Luting Using Osteotomized Equine Third Metacarpal Bones with a Limited Contact‐Dynamic Compression Plate

Abstract

The cyclic fatigue data supports the conclusion that luted broad LC-DCP fixation is biomechanically superior to the non-luted broad LC-DCP fixation in osteotomized equine MC3 bones.

An In Vitro Biomechanical Comparison of a 5.5 mm Limited‐Contact Dynamic Compression Plate Fixation with a 4.5 mm Limited‐Contact Dynamic Compression Plate Fixation of Osteotomized Equine Third Metacarpal Bones

“…To maintain consistency with previous studies, 1,2 an 8‐hole 5.5 mm broad LC‐DCP was required, however, the 5.5 broad LC‐DCP is only available in 10 holes and greater. A 10‐hole 5.5 broad LC‐DCP was placed in a positioning jig and each end hole of the plate was cut off using an abrasive cut‐off saw.…”

An In Vitro Biomechanical Comparison of a Prototype Equine Metacarpal Dynamic Compression Plate Fixation with Double Dynamic Compression Plate Fixation of Osteotomized Equine Third Metacarpal Bones

“…Continuous cyclic loading of an implant within the elastic (linear) region of the load–deformation curve can lead to fatigue failure of the implant. In cyclic fatigue testing, under 4‐point bending, a maximum load of 7.5 kN was chosen to be consistent with previous studies 9,10 . This load allowed cyclic testing to failure within a reasonable time limit.…”

“…The concept of biologic plating is often difficult to achieve in equine orthopedic surgery. In an in vitro study, using osteotomized equine third metacarpal bones, broad 4.5 mm limited contact dynamic compression plate (LC‐DCP), a biological plate, had a shorter cyclic fatigue life than a single broad 4.5 mm DCP, with and without plate luting 9,10 . The typical horse is ambulatory and fully weight bearing in the immediate postoperative period 2,11 .…”

In Vitro Biomechanical Comparison of Locking Compression Plate Fixation and Limited‐Contact Dynamic Compression Plate Fixation of Osteotomized Equine Third Metacarpal Bones

“…An 8‐hole 4.5‐LC‐DCP (Synthes Ltd) was secured on the dorsal surface of the contralateral MC3 bone with four 5.5 mm and four 4.5 mm screws, and an osteotomy was created in the mid‐diaphysis of the MC3 bone and through the small metacarpal bones, as described in previous studies 7,8 …”

“…6 An 8-hole 4.5-LC-DCP (Synthes Ltd) was secured on the dorsal surface of the contralateral MC3 bone with four 5.5 mm and four 4.5 mm screws, and an osteotomy was created in the mid-diaphysis of the MC3 bone and through the small metacarpal bones, as described in previous studies. 7,8 Mechanical Testing Palmarodorsal 4-point bending, single cycle to failure and cyclic fatigue testing and torsional testing, single cycle to failure was performed as described in previous studies. 7,8 Data analysis was performed and failure modes were determined as described previously.…”