Association between findings on palmarodorsal ...

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Title Association between findings on palmarodorsal radiographic images and detection of a fracture in the proximal sesamoid bones of forelimbs obtained from cadavers of racing Thoroughbreds
Author(s) Lucy A. Anthenill, Susan M. Stover, Ian A. Gardner, Ashley E. Hill, Christina M. Lee, Mark L. Anderson, Bradd C. Barr, Deryck H. Read, Bill J. Johnson, Leslie W. Woods, Barbara M. Daft, Hailu Kinde, Janet D. Moore, Cynthia A. Farman, Jenee S. Odani, Patricia A. Pesavento, Francisco A. Uzal, James T. Case, Alex A. Ardans
Journal American Journal of Veterinary Research
Date 2006
Volume 67
Issue 5
Start page 858
End page 868
Abstract Objective: Sample Population: Procedure: Results: Conclusions and Clinical Relevance: To determine the distribution for limbs and bones in horses with fractures of the proximal sesamoid bones and relationships with findings on palmarodorsal radiographic images.Proximal sesamoid bones obtained from both forelimbs of cadavers of 328 racing Thoroughbreds.Osteophytes; large vascular channels; and fracture location, orientation, configuration, and margin distinctness were categorized by use of high-detail contact palmarodorsal radiographs. Distributions of findings were determined. Relationships between radiographic findings and fracture characteristics were examined by use of chi2 and logistic regression techniques.Fractures were detected in 136 (41.5%) horses. Biaxial fractures were evident in 109 (80%) horses with a fracture. Osteophytes and large vascular channels were evident in 266 (81%) and 325 (99%) horses, respectively. Medial bones typically had complete transverse or split transverse simple fractures, indistinct fracture margins, > 1 vascular channel that was > 1 mm in width, and osteophytes in abaxial wing and basilar middle or basilar abaxial locations. Lateral bones typically had an oblique fracture and distinct fracture margins. Odds of proximal sesamoid bone fracture were approximately 2 to 5 times higher in bones without radiographic evidence of osteophytes or large vascular channels, respectively.Biaxial fractures of proximal sesamoid bones were common in cadavers of racing Thoroughbreds. Differences between medial and lateral bones for characteristics associated with fracture may relate to differences in fracture pathogeneses for these bones. Osteophytes and vascular channels were common findings; however, fractures were less likely to occur in bones with these features.

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