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

Abstract

Results of this in vitro study support the conclusion that the prototype EM-DCP fixation is biomechanically superior to the double broad DCP fixation for the stabilization of osteotomized equine MC3.

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

“…Another factor is the screw size (4.5, 5.0, or 5.5 mm), screw type (cortical or locking) and the pattern of screw placement in the plate. The effect of different screw size and type and pattern of screw placement on the mean yield and failure bending moments and mean composite rigidity in 4‐point bending, single cycle to failure testing has been reported previously 9,10 and is demonstrated by our results. The primary difference between the 4.5‐LCP‐MC3 and 4.5‐LC‐DCP constructs were the screws securing the plates.…”

An In Vitro Biomechanical Comparison Between Prototype Tapered Shaft Cortical Bone Screws and AO Cortical Bone Screws for an Equine Metacarpal Dynamic Compression Plate Fixation of Osteotomized Equine Third Metacarpal Bones

“…In cyclic fatigue testing, under 4‐point bending, the maximum load of 7.5 kN was chosen to be consistent with previous studies 8,9 . This load allowed cyclic testing to failure within a reasonable time limit.…”

“…10 In cyclic fatigue testing, under 4-point bending, the maximum load of 7.5 kN was chosen to be consistent with previous studies. 8,9 This load allowed cyclic testing to failure within a reasonable time limit. The number of cycles to failure under palmarodorsal 4-point bending for the TSS construct was significantly greater compared with the AO construct.…”

“…The EM‐DCP has been previously described 8 . The oval DCP and round plate holes on either side of the middle section were modified to accommodate the 5.5 mm tapered shaft screws.…”

“…The EM-DCP has been previously described. 8 The oval DCP and round plate holes on either side of the middle section were modified to accommodate the 5.5 mm tapered shaft screws. The plate holes have the same dimension as the original EM-DCP but has tapered sides corresponding to the tapered shaft of the prototype screw.…”