Stiffness of meniscus tissue depends on tibio-femoral load and structural integrity of the meniscus root

Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
Christian StärkeSebastian Kopf

Abstract

Development of meniscus replacements requires in-depth knowledge of the material properties and biomechanical behavior of the native meniscus. The compressive properties are of particular interest in this context, which are often assessed with indentation tests. However, those tests are usually done on isolated tissue specimens ex situ, which could have a significant impact on the results. It was, therefore, the goal of the study to assess the stiffness of the meniscus tissue in situ in porcine specimens and to compare it to that of artificial substitutes. Porcine knees (n = 8) were prepared such that the medial meniscus periphery was exposed and the knees could be mounted in a materials testing machine. The tissue stiffness was than measured on the meniscus periphery using a Shore-A durometer in (1) the unloaded knee, (2) with 500-N tibio-femoral compressive load, and (3) with 500-N tibio-femoral load and the posterior meniscus root detached. The stiffness of the meniscus tissue was significantly increased when tibio-femoral load was applied, while this effect was lost when the meniscus root was cut (average measurements on a 0-100 Shore-A durometer scale: group A, 33.8; group B, 58.4; and group C, 36.2). Polyurethane and coll...Continue Reading

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Citations

Oct 28, 2019·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Yuta TachibanaKen Nakata

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