Pitfalls during biomechanical testing - Evaluation of different fixation methods for measuring tendons endurance properties

Gy Hangody, G. Pánics, G. SzebÃnyi, R. Kiss, L. Hangody, K. Pap

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The goal of the study was to find a proper technique to fix tendon grafts into an INSTRON loading machine. From 8 human cadavers, 40 grafts were collected. We removed the bone-patella tendon-bone grafts, the semitendinosus and gracilis tendons, the quadriceps tendon-bone grafts, the Achilles tendons, and the peroneus longus tendons from each lower extremity. We tested the tendon grafts with five different types of fixation devices: surgical thread (Premicron 3), general mounting clamp, wire mesh, cement fixation, and a modified clamp for an INSTRON loading machine. The mean failure load in case of surgical thread fixation was (381N ± 26N). The results with the general clamp were (527N ± 45N). The wire meshes were more promising (750N ± 21N), but did not reach the outcomes we desired. Easy slippages of the ends of the tendons from the cement encasements were observed (253N ± 18N). We then began to use Shi's clamp that could produce 977N ± 416N peak force. We combined Shi's clamp with freezing of the graft and the rupture of the tendon itself demonstrated an average force of 2198 N ± 773N. We determined that our modified frozen clamp fixed the specimens against high tensile forces.

Original languageEnglish
Pages (from-to)86-93
Number of pages8
JournalPhysiology International
Volume103
Issue number1
DOIs
Publication statusPublished - Mar 1 2016

Keywords

  • Biomechanical testing
  • Frozen clamp
  • Human tendons
  • Load to failure test
  • Tendon allograft

ASJC Scopus subject areas

  • Physiology (medical)

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