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. 2021 Dec 10;9:779946. doi: 10.3389/fbioe.2021.779946

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Copyright © 2021 de Roy, Warnecke, Hacker, Simon, Dürselen, Ignatius and Seitz.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) Scatter plots (median with individual values) of the boundary friction coefficient (µ_lin, symbol color: orange) under stance phase conditions. (B) Scatter plots (median with individual values) of the viscous friction coefficient (µ, symbol color: blue) and the viscous damping coefficient (c, symbol color: green) in kgm²/s under stance phase conditions. Each joint was tested in three consecutive meniscus states: intact (symbol shape: circles), with a posterior medial meniscus root tear (PMMR tear) (symbol shape: squares) and medial meniscectomy (MM) (symbol shape: rectangles). The tests were performed directly after loading the joints with 1000 N (T₀, filled symbols) and after resting under the axial load for 20 min (T₂₀, unfilled symbols). Non-parametric statistical analyses: n = 6; *p < 0.05.