Universität zu Köln

Oswald, Irina, Rickert, Markus, Brueggemann, Gert-Peter, Niehoff, Anja, Ulloa, Carlos Alfonso Fonseca and Jahnke, Alexander (2017). The influence of cryopreservation and quick-freezing on the mechanical properties of tendons. J. Biomech., 64. S. 226 - 231. OXFORD: ELSEVIER SCI LTD. ISSN 1873-2380

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Abstract

In order to maintain their native properties, cryopreserved tendons are usually used in biomechanical research and in transplantation of allogenic tendon grafts. The use of different study protocols leads to controversy in literature and thus complicates the evaluation of the current literature. The aim of this study consisted in examining the influence of different freezing and thawing temperatures on the mechanical properties of tendons. 60 porcine tendons were frozen at either -80 degrees C or -20 degrees C for 7 days and thawed at room or body temperature for 240 or 30 min, respectively. A subgroup of ten tendons was quick-frozen with liquid nitrogen (-196 degrees C) for 2 s before cryopreservation. Biomechanical testing was performed with a material testing machine and included creep, cyclic and load-to-failure tests. The results showed that freezing leads to a reduced creep strain after constant loading and to an increased secant modulus. Freezing temperature of -80 degrees C increased the secant modulus and decreased the strain at maximum stress, whereas thawing at room temperature reduced the maximum stress, the strain at initial tendon failure and the Young's Modulus. Quick-freezing led to increased creep strain after constant loading, increased strain at initial failure in the load-to-failure test, and decreased strain at maximum stress. When cryopreserving, tendons for scientific or medical reasons, freezing temperature of -20 degrees C and thawing temperature of 37.5 degrees C are recommended to maintain the native properties of tendons. A treatment with liquid nitrogen in the sterilization process of tendon allografts is inadvisable because it alters the tendon properties negatively. (C) 2017 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Oswald, Irina UNSPECIFIED UNSPECIFIED UNSPECIFIED Rickert, Markus UNSPECIFIED UNSPECIFIED UNSPECIFIED Brueggemann, Gert-Peter UNSPECIFIED UNSPECIFIED UNSPECIFIED Niehoff, Anja UNSPECIFIED UNSPECIFIED UNSPECIFIED Ulloa, Carlos Alfonso Fonseca UNSPECIFIED UNSPECIFIED UNSPECIFIED Jahnke, Alexander UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-211429
DOI:	10.1016/j.jbiomech.2017.08.018
Journal or Publication Title:	J. Biomech.
Volume:	64
Page Range:	S. 226 - 231
Date:	2017
Publisher:	ELSEVIER SCI LTD
Place of Publication:	OXFORD
ISSN:	1873-2380
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ACHILLES TENDONS; TENSILE-STRENGTH; PATELLAR TENDON; RECONSTRUCTION; ALLOGRAFT Multiple languages Biophysics; Engineering, Biomedical Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/21142