Theses and Dissertations

Advisor

Mochal-King, Cathleen A.

Committee Member

Priddy, Lauren B.

Committee Member

Jaffe, Michael

Date of Degree

8-9-2022

Document Type

Graduate Thesis - Open Access

Major

Veterinary Science

Degree Name

Master of Science (M.S.)

College

College of Veterinary Medicine

Department

Veterinary Medical Science Program

Abstract

Frontal plane slab fractures account for the majority of third carpal bone (C3) fractures in performance horses. Treatment is stabilization with an AO cortical screw. Complications are fragment splitting, fragment spinning, and irritation of dorsal soft tissue structures. A novel, headless, cannulated screw with interlocking threads (the Headless Compression Screw Fastener, HCSF) has been developed to resist multidirectional forces. Simulated C3 slab fractures were created in nine paired equine carpi. HCSF or AO cortical screws were loaded in shear to failure. Stiffness, maximum load to failure, and yield load was assessed in linear mixed models. No significant difference was detected in maximum load to failure, stiffness, or yield load. Mode of failure was screw bending in all specimens. The HCSF successfully repaired simulated third carpal bone fractures. The design eliminates counter sinking. There was no significant difference compared to the cortical screws. These results promote clinical application.

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