XXXX fixation with pre-contoured plate: Comparison of composite and cadaver bones.

@entity1 @entity174 @entity177 @entity9256 @entity2693
AIM: To determine whether use of a precontoured olecranon plate provides adequate fixation to withstand supraphysiologic force in a @entity9256 model. METHODS: Five samples of fourth generation composite bones and five samples of fresh frozen @entity1 cadaveric left ulnae were utilized for this study. The cadaveric specimens underwent dual-energy X-ray absorptiometry (DEXA) scanning to quantify the bone quality. The composite and cadaveric bones were prepared by creating a @entity9256 and fixed with a pre-contoured olecranon plate with locking screws. Construct @entity2693 and failure load were measured by subjecting specimens to cantilever bending moments until failure. @entity174 site motion was measured with differential variable resistance transducer spanning the @entity174 . Statistical analysis was performed with two-tailed Mann-Whitney-U test with Monte Carlo Exact test. RESULTS: There was a significant difference in fixation @entity2693 and strength between the composite bones and @entity1 cadaver bones. Failure modes differed in cadaveric and composite specimens. The load to failure for the composite bones (n = 5) and @entity1 cadaver bones (n = 5) specimens were 10.67 nm (range 9.40-11.91 nm) and 13.05 nm (range 12.59-15.38 nm) respectively. This difference was statistically significant (P    0.007, 97% power). Median @entity2693 for composite bones and @entity1 cadaver bones specimens were 5.69 nm/mm (range 4.69-6.80 nm/mm) and 7.55 nm/mm (range 6.31-7.72 nm/mm). There was a significant difference for @entity2693 (P    0.033, 79% power) between composite bones and cadaveric bones. No correlation was found between the DEXA results and @entity2693 . All cadaveric specimens withstood the physiologic load anticipated postoperatively. @entity177 occurred in all composite specimens. All failures resulted from composite bone failure at the distal screw site and not hardware failure. There were no catastrophic @entity174 in the cadaveric specimens. Failure of 4/5 cadaveric specimens was defined when a @entity174 gap of 2 mm was observed, but 1/5 cadaveric specimens failed due to a failure of the triceps mechanism. All failures occurred at forces greater than that expected in postoperative period prior to healing. CONCLUSION: The pre-contoured olecranon plate provides adequate fixation to withstand physiologic force in a composite bone and cadaveric @entity9256 model.
