Abstract
The rat is frequently used as a model to study the characteristics, aetiology and pathology of the Achilles tendon. However, though the structure of the human Achilles tendon has been extensively investigated, the anatomical structure of the rat Achilles tendon remains unclear, which impedes the ability to use rats to study Achilles tendinopathy. The purpose of this study was to reveal the structure of the rat Achilles tendon and to explore its similarities with the human Achilles tendon through an anatomical dissection of 80 rat Achilles tendons (40 female, 40 male). This study found that the subtendons of the rat Achilles tendon originating from the triceps surae muscle were twisted, and each subtendon also had its own torsion. The extent of these two types of torsion could be very different between rats. Alterations in this torsion may result in distinct stress fields in the Achilles tendon, which may play a critical role in the pathogenesis of Achilles tendinopathy. This study provides an important basis to support the use of rats as model animals to investigate the characteristics of the human Achilles tendon and Achilles tendinopathy.
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