7.3-mm cannulated-shaft screws show no difference in compression or load to failure compared to 7.0-mm variable-pitch screws for bovine capital physeal fracture repair.
Madison R Baker, Andrew J Niehaus, Sushmitha Durgam, Alan S Litsky, Brianna A Jordan, Hilary C Rice, Jeffrey Lakritz, Joseph W Lozier
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引用次数: 0
Abstract
Objective: To compare compression and load to failure of 7.3-mm threaded-shaft screws (7.3 TSSs) and 7.0-mm variable-pitch (7.0 VP) fully threaded compression screws for bovine capital physeal fracture fixation. We hypothesized that the 7.3 TSSs would provide significantly more compression and higher load to failure than the 7.0 VP screws and that reconstructed specimens would not fail when subjected to simulated walking load.
Methods: Compression was measured utilizing wooden fracture simulators that were randomly assigned to be repaired with either 7.3 TSSs or 7.0 VP screws (n = 8), and compression was recorded with a FlexiForce sensor. Cadaveric bovine femurs with induced capital physeal fractures were repaired with either 7.3 TSSs (n = 5) or 7.0 VP screws (n = 5) before being placed through 1,400 cycles under cyclic loading and single load to failure in a load press.
Results: The median compression for the 7.3 TSSs (70.2 N; range, 44.7 to 76.3) was not significantly different compared to 7.0 VP screws (33.4 N; range, 25.55 to 40.45). No constructs failed during cyclic loading. There was no significant difference between the mean force at the time of failure of the 7.3 TSSs (6.67 ± 1.62 kN) and 7.0 VP screws (10.4 ± 3.73 kN).
Conclusions: 7.3 TSSs and 7.0 VP screws demonstrated no significant difference in compression or load to failure.
Clinical relevance: The present study supports the use of 7.3 TSSs and 7.0 VP screws to repair bovine capital physeal fractures. Further in vivo investigation to evaluate the impact of soft tissues and additional cycling is needed prior to implementing 7.0 VP screws in clinical cases.
期刊介绍：
The American Journal of Veterinary Research supports the collaborative exchange of information between researchers and clinicians by publishing novel research findings that bridge the gulf between basic research and clinical practice or that help to translate laboratory research and preclinical studies to the development of clinical trials and clinical practice. The journal welcomes submission of high-quality original studies and review articles in a wide range of scientific fields, including anatomy, anesthesiology, animal welfare, behavior, epidemiology, genetics, heredity, infectious disease, molecular biology, oncology, pharmacology, pathogenic mechanisms, physiology, surgery, theriogenology, toxicology, and vaccinology. Species of interest include production animals, companion animals, equids, exotic animals, birds, reptiles, and wild and marine animals. Reports of laboratory animal studies and studies involving the use of animals as experimental models of human diseases are considered only when the study results are of demonstrable benefit to the species used in the research or to another species of veterinary interest. Other fields of interest or animals species are not necessarily excluded from consideration, but such reports must focus on novel research findings. Submitted papers must make an original and substantial contribution to the veterinary medicine knowledge base; preliminary studies are not appropriate.
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