Morphological changes of the triceps surae muscle-tendon unit during passive extension

An in vivo rabbit model

Jui Sheng Sun, Yi Shiong Hang, Yang Hwei Tsuang, Cheng Kung Cheng, King Yaw Tsao, Shang Hwa Hsu

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Objective. To elucidate the morphological and biomechanical manifestation of the triceps surae muscle-tendon unit during passive extension. Design. The instantaneous changes within the load-deformation curve of muscle-tendon unit were analyzed by an in vivo rabbit model. Background. Although muscle strains occur more frequently than complete failures, the failure mechanism of these sub-failure injuries is rarely investigated. Monitoring of the instantaneous changes in the load-deformation curve allows correlation with the morphological changes that occur during passive extension. Methods. After anesthesia, the triceps surae muscle of rabbit was dissected and then stretched to failure by a MTS Bionix 858 machine. The morphological changes in failure patterns were recorded by photographs. Results. The morphological and biomechanical manifestations of the triceps surae muscle-tendon unit was divided into five different portions: first, the viscoelastic portion with minimal morphologic change; second, the portion of micro-failure with local ecchymosis; third and fourth, the portions of macrofailure with sequential rupture of the muscle fibers; and fifth, the portion of rupture and separation of muscle parenchyma. Conclusions. A threshold for stretch-induced injury does exist. The threshold of the initiation of micro-failure in this model was 16.5% of the strain, which corresponded to 16.6% of the maximal sustainable force.

Original languageEnglish
Pages (from-to)634-640
Number of pages7
JournalClinical Biomechanics
Volume13
Issue number8
DOIs
Publication statusPublished - Dec 1998
Externally publishedYes

Fingerprint

Tendons
Rabbits
Muscles
Rupture
Ecchymosis
Wounds and Injuries
Anesthesia

Keywords

  • Macrofailure
  • Micro-failure
  • Passive extension
  • Triceps surae muscle

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

Cite this

Morphological changes of the triceps surae muscle-tendon unit during passive extension : An in vivo rabbit model. / Sun, Jui Sheng; Hang, Yi Shiong; Tsuang, Yang Hwei; Cheng, Cheng Kung; Tsao, King Yaw; Hsu, Shang Hwa.

In: Clinical Biomechanics, Vol. 13, No. 8, 12.1998, p. 634-640.

Research output: Contribution to journalArticle

Sun, Jui Sheng ; Hang, Yi Shiong ; Tsuang, Yang Hwei ; Cheng, Cheng Kung ; Tsao, King Yaw ; Hsu, Shang Hwa. / Morphological changes of the triceps surae muscle-tendon unit during passive extension : An in vivo rabbit model. In: Clinical Biomechanics. 1998 ; Vol. 13, No. 8. pp. 634-640.
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