Novel approach to dynamic knee laxity measurement using capacitive strain gauges

Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA
Martin ZensHerrmann O Mayr

Abstract

Knee joint laxities are observed in patients after severe trauma to the joint, resulting in ligament tears. Specifically, injuries to the anterior cruciate ligament may cause a significant instability. The degree of these laxities is essential in diagnostics and may affect which treatment option is suggested. Polydimethylsiloxane (PDMS) strain gauges are proposed as a non-invasive, highly accurate and easy-to-use measurement method to quantify anterolateral and rotational laxities of the knee joint during active and passive motion. In this work, proof-of-concept measurements and a prototype of the proposed device are displayed. The measurements were taken using a knee test rig, which has specifically been designed for this purpose. This apparatus allows the simulation of isolated knee joint instabilities with a motor-controlled model of a human knee. The absolute sensitivity [Formula: see text] of an exemplary sensor was determined to be 2.038 [Formula: see text]; the relative sensitivity [Formula: see text] was 1.121 [Formula: see text]. Optimal positions of sensors to capture bone-to-bone displacement as projected displacement on the skin were identified. PDMS strain gauges are capable of measuring bone-to-bone displacements ...Continue Reading

References

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Citations

Oct 8, 2016·Nanoscale·Jonathan D PeganMichelle Khine
May 8, 2019·Frontiers in Robotics and AI·Ben OldfreyMark Miodownik
Dec 7, 2021·Archives of Orthopaedic and Trauma Surgery·Hermann O MayrWolf C Prall

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