Biomechanical testing
rupture
The prepared specimens were fixed to a custom jig and secured to the actuator of the universal tensile testing machines (Z010 Test Controll II, ZwickRoell, Ulm, Germany). The triceps muscles of the prepared specimens were then fixed using cryoclamps in a way that all fibers of the triceps tendon were stretched as evenly as possible. The ulna was positioned in accordance with the experimental design by Petre et al. [The triceps muscle and tendon (star) were fixed using cryoclamps (blue arrow) with the ulna (triangle) positioned in full elbow extension in relation to the distal triceps tendonA continuous pull of 30 mm per minute applied to the tendon until the tendon ruptured completely was determined in pilot testing in order to best observe the rupture mechanism. The ultimate load to failure (N) was measured for each specimen. Specimen were excluded if bony avulsion of the tendon occurred.