Knee stiffness and viscosity: New implementation and perspectives in prosthesis development

Bohinc, Klemen; Vantur, Nejc; Torkar, Drago; Lampe, Tomaž; Hribernik, Marija; Jakovljević, Miroljub

doi:10.17305/bjbms.2017.1765

Cited by 4 publications

(3 citation statements)

References 31 publications

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“…This limits more detailed considerations of the extent to which the meniscus state affects the boundary friction coefficient (µ lin ) or the viscous friction (µ) and the viscous damping coefficient (c). Another limitation is that a passive pendulum friction device cannot simulate active muscle forces or provide stabilization of the patella, which has an influence on the joint kinematics (Bull and Amis, 1998;Bohinc et al, 2017). When evaluating joint friction based on kinematic data, this limits the comparability to the in vivo knee joint friction.…”

Section: Discussionmentioning

confidence: 99%

“…It was already stated that intraarticular ligaments and soft tissues have a significant effect on the viscous damping of a passive joint motion. For example, Bohinc et al found in their study that the viscous damping of a human leg oscillation decreased the more tissue was resected (Bohinc et al, 2017). Therefore, joint friction does not only depend on the boundary friction between the tibia, femur and the meniscus surfaces, but also on the viscous damping of the surrounding soft tissues (Charnley, 1960;Akelman et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Meniscus Injury and its Surgical Treatment Does not Increase Initial Whole Knee Joint Friction

Roy

Warnecke

Hacker

et al. 2021

Front. Bioeng. Biotechnol.

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While it is generally accepted that traumatic meniscus pathologies lead to degenerative articular cartilage changes in the mid-to long-term and consecutively to post-traumatic osteoarthritis (PTOA), very little is known about how such injuries initiate tribological changes within the knee and their possible impact on PTOA acceleration. Therefore, the aim of this study was to investigate the influence of three different medial meniscus states (intact, posterior root tear, total meniscectomy) on the initial whole knee joint friction. Six ovine knee joints were tested in a passive pendulum friction testing device under an axial load of 250 N and an initial deflection of 12°, representing swing phase conditions, and under an axial load of 1000 N and an initial deflection of 5°, simulating stance phase conditions. To additionally consider the influence of the time-dependent viscoelastic nature of the knee joint soft tissues on whole joint friction, the tests were performed twice, directly following load application and after 20 min creep loading of either 250 N or 1000 N axial load. On the basis of a three-dimensional joint kinematic analysis, the energy loss during the passive joint motion was analyzed, which allowed considerations on frictional and damping processes within the joint. The so-called “whole knee joint” friction was evaluated using the boundary friction model from Stanton and a viscous friction model from Crisco et al., both analyzing the passive joint flexion-extension motion in the sagittal plane. Significantly lower friction coefficients were observed in the simulated swing phase after meniscectomy (p < 0.05) compared to the intact state. No initial whole joint friction differences between the three meniscus states (p > 0.05) were found under stance phase conditions. Soft tissue creeping significantly increased all the determined friction coefficients (p < 0.05) after resting under load for 20 min. The exponential decay function of the viscous friction model provided a better fit (R2∼0.99) to the decaying flexion-extension data than the linear decay function of the boundary friction model (R2∼0.60). In conclusion, this tribological in vitro study on ovine knee joints indicated that neither a simulated posterior medial meniscus root tear nor the removal of the medial meniscus resulted in an initially increased whole joint friction.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Meniscus Injury and its Surgical Treatment Does not Increase Initial Whole Knee Joint Friction

Roy

Warnecke

Hacker

et al. 2021

Front. Bioeng. Biotechnol.

View full text Add to dashboard Cite

show abstract

“…11 Passive pendulum test is one of the methods for calculating knee passive properties utilized for estimating the stiffness and viscosity parameters during the leg oscillation. 12,13 The limitation of the supplies and laboratory equipment for video recording systems, and the electro-goniometer errors due to possible movements with leg twists are the disadvantages of these methods Although most studies have used a nonlinear elastic element, all of them offer a wide range of models for the loss element of passive torque. 14,15…”

Section: Introductionmentioning

confidence: 99%

Modeling the resistance mechanism of passive knee joint flexion and extension for use in rehabilitation equipment

Amiri

Ghomsheh

Ghazalian

2021

Proc Inst Mech Eng H

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The purpose of this study was to model the resistance mechanism of Passive Knee Joint Flexion and Extension to create a similar torque mechanism in rehabilitation equipment. In order to better model the behavior of passive knee tissues, it is necessary to exactly calculate the two coefficients of elasticity of time-independent and time-dependent parts. Ten healthy male volunteers (mean height 176.4+/−4.59 cm) participated in this study. Passive knee joint flexion and extension occurred at velocities of 15, 45, and 120 (degree/s), and in five consecutive cycles and within the range of 0 to 100° of knee movement on the sagittal plane on Cybex isokinetic dynamometer. To ensure that the muscles were relaxed, the electrical activity of knee muscles was recorded. The elastic coefficient, (KS) increased with elevating the passive velocity in flexion and extension. The elastic coefficient, (KP) was observed to grow with the passive velocity increase. While, the viscous coefficient (C) diminished with passive velocity rise in extension and flexion. The heightened passive velocity of the motion resulted in increased hysteresis (at a rate of 42%). The desired of passive velocity is lower so that there is less energy lost and the viscoelastic resistance of the tissue in the movement decreases. The Coefficient of Determination, R2 between the model-responses and experimental curves in the extension was 0.96 < R2 < 0.99 and in flexion was 0.95 < R2 < 0.99. This modeling is capable of predicting the true performance of the components of passive knee movement and we can create a resistance mechanism in the rehabilitation equipment to perform knee joint movement. Quantitative measurements of two elastic coefficients of Time-independent and Time-dependent parts passive knee joint coefficients should be used for better accurate simulation the behavior of passive tissues in the knee which is not seen in other studies.

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Detection of Meniscal Tear Effects on Tibial Vibration Using Passive Knee Sound Measurements

Ozmen

Safaei²,

Semiz³

et al. 2021

IEEE Trans. Biomed. Eng.

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Knee stiffness and viscosity: New implementation and perspectives in prosthesis development

Cited by 4 publications

References 31 publications

Meniscus Injury and its Surgical Treatment Does not Increase Initial Whole Knee Joint Friction

Meniscus Injury and its Surgical Treatment Does not Increase Initial Whole Knee Joint Friction

Modeling the resistance mechanism of passive knee joint flexion and extension for use in rehabilitation equipment

Detection of Meniscal Tear Effects on Tibial Vibration Using Passive Knee Sound Measurements

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