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Updated: Aug 12, 2026
Creating Rigidly Stabilized Fractures for Assessing Intramembranous Ossification, Distraction Osteogenesis, or Healing of Critical Sized Defects
Published on: April 11, 2012
In vitro biomechanical properties of 2 compression fixation methods for midbody proximal sesamoid bone fractures in
J B Woodie1, A J Ruggles, A S Litsky
1Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, USA.
Objective:
To evaluate 2 methods of midbody proximal sesamoid bone repair--fixation by a screw placed in lag fashion and circumferential wire fixation--by comparing yield load and the adjacent soft-tissue strain during monotonic loading.
Study Design:
Experimental study.
Sample Population:
10 paired equine cadaver forelimbs from race-trained horses.
Methods:
A transverse midbody osteotomy of the medial proximal sesamoid bone (PSB) was created. The osteotomy was repaired with a 4.5-mm cortex bone screw placed in lag fashion or a 1.25-mm circumferential wire. The limbs were instrumented with differential variable reluctance transducers placed in the suspensory apparatus and distal sesamoidean ligaments. The limbs were tested in axial compression in a single cycle until failure.
Results:
The cortex bone screw repairs had a mean yield load of 2,908.2 N; 1 limb did not fail when tested to 5,000 N. All circumferential wire repairs failed with a mean yield load of 3,406.3 N. There was no statistical difference in mean yield load between the 2 repair methods. The maximum strain generated in the soft tissues attached to the proximal sesamoid bones was not significantly different between repair groups.
Conclusions:
All repaired limbs were able to withstand loads equal to those reportedly applied to the suspensory apparatus in vivo during walking.
Clinical Relevance:
Each repair technique should have adequate yield strength for repair of midbody fractures of the PSB immediately after surgery.
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