The purpose of this study was to develop a new device, which represents a modification of the Cryo-Jaw described by Riemersa and Schamhardt and modified by Hamner et al., for in vitro biomechanical testing of tendons which allows the lower clamp to move in every direction and thus simulate a pathological dislocation of the knee. Tendons are fixed to the device by freezing the clamped part with dry ice. After fixation of their free ends. the lower clamp was rotated 45, translated 1 em, and angled 40 to simulate a knee sprain, Various configurations of bundles were tested: parallel, twisted, and braided. Tests were performed on 10 paired bovine bifurcated digital extensor tendons and 6 paired human hamstring tendons. Grafts were then tested to failure subjected to impulsive load, using a servohydraulic machine. The highest ultimate load recorded for parallel bundles was 4662 +/- 565.71 N for bovine bifurcated digital extensor tendons, and 3057 +/- 475.44 N for human hamstring tendons. In any case, the tendons ruptured midway, well clear of the frozen part; in no case was slippage of the tendons observed. Thus the device proposed allows one to test what happens to the graft of an ACL reconstructed knee during physiological and pathological movements because it can be easily displaced in every direction.

A modified Cryo-Jaw for in vitro biomechanical testing of tendons / Valente, Marco; Francesca, Nanni; Monteleone, Lucilla; Ferretti, Andrea; Conteduca, Fabio; F., Morelli. - In: JOURNAL OF APPLIED BIOMECHANICS. - ISSN 1065-8483. - STAMPA. - 18:4(2002), pp. 384-389.

A modified Cryo-Jaw for in vitro biomechanical testing of tendons

VALENTE, Marco;MONTELEONE, Lucilla;FERRETTI, Andrea;CONTEDUCA, Fabio;
2002

Abstract

The purpose of this study was to develop a new device, which represents a modification of the Cryo-Jaw described by Riemersa and Schamhardt and modified by Hamner et al., for in vitro biomechanical testing of tendons which allows the lower clamp to move in every direction and thus simulate a pathological dislocation of the knee. Tendons are fixed to the device by freezing the clamped part with dry ice. After fixation of their free ends. the lower clamp was rotated 45, translated 1 em, and angled 40 to simulate a knee sprain, Various configurations of bundles were tested: parallel, twisted, and braided. Tests were performed on 10 paired bovine bifurcated digital extensor tendons and 6 paired human hamstring tendons. Grafts were then tested to failure subjected to impulsive load, using a servohydraulic machine. The highest ultimate load recorded for parallel bundles was 4662 +/- 565.71 N for bovine bifurcated digital extensor tendons, and 3057 +/- 475.44 N for human hamstring tendons. In any case, the tendons ruptured midway, well clear of the frozen part; in no case was slippage of the tendons observed. Thus the device proposed allows one to test what happens to the graft of an ACL reconstructed knee during physiological and pathological movements because it can be easily displaced in every direction.
acl; biomechanical of tendons; clamp; cryo-jow testing equipment; dry ice; hamstrings
01 Pubblicazione su rivista::01a Articolo in rivista
A modified Cryo-Jaw for in vitro biomechanical testing of tendons / Valente, Marco; Francesca, Nanni; Monteleone, Lucilla; Ferretti, Andrea; Conteduca, Fabio; F., Morelli. - In: JOURNAL OF APPLIED BIOMECHANICS. - ISSN 1065-8483. - STAMPA. - 18:4(2002), pp. 384-389.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/44849
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