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Estimation of forces on anterior cruciate ligament in dynamic activities

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Abstract

In this work, a nonlinear strain rate dependent plugin developed for the OpenSim® platform was used to estimate the instantaneous strain rate (ISR) and the forces on the ACL’s anteromedial (aACL) and posterolateral (pACL) bundles during walking and sudden change of direction of running termed as ‘plant-and-cut’ (PC). The authors obtained the kinematics data for walking via optical motion capture. PC movements, along with running kinematics, were obtained from the literature. A nonlinear plugin developed for ligaments was interfaced with OpenSim® platform to simulate walking and PC motions with a flexed knee and an extended knee. PC phase is sandwiched between an approach phase and take-off phase and was studied at various event velocities (1.8, 3, and 4.2 m s−1), and angles of PC (23°, 34°, and 45°) as encountered in adult ball games. In both cases of PC-with-extended knee and PC-with-flexed-knee, the maximum forces on both the ACL bundles were observed after the take-off phase. A maximum force of ~ 35 N kg−1 of body weight (BW) was observed on aACL after the take-off phase for an event velocity of 4.2 m s−1. In the posterolateral bundle (pACL), the maximum forces (~ 40 N kg−1 of BW) were observed towards the end of the mid-swing phase (after the take-off phase) for the various combinations of the parameters studied. The forces observed in the simulation of PC-with-flexed-knee and PC-with-extended-knee has resulted in magnitude higher than sustainable by the adults. This study is novel in attempting to incorporate differing rates-of-strain that have been shown to alter soft tissue properties into the OpenSim® musculoskeletal model. The proposed model can be used by researchers to predict the forces during various kinematic activities for other soft tissues.

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Abbreviations

ACL:

Anterior cruciate ligament

FATC:

Femur-anterior cruciate ligament-tibial complex

aACL:

Anteromedial bundle of anterior cruciate ligament

pACL:

Posterolateral bundle of anterior cruciate ligament

BW:

Body weight

r st :

Strain rate

ISR:

Instantaneous strain rate

GRF:

Ground reaction force

IR:

Internal rotation

ER:

External rotation

IC:

Initial contact

PC:

Plant-and-cut

PC-with-flexed-knee:

Plant-and-cut With flexed knee

PC-with-extended-knee:

Plant-and-cut With extended knee

RHS:

Right heel strike

RTO:

Right toe-off

LHS:

Left heel strike

LTO:

Left toe-off

PCA:

Angle of plant-and-cut

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Funding

No funding was received for this work.

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Authors

Contributions

AS developed the plugin, simulated the dynamic activities and drafted the manuscript, MM edited the manuscript and DK edited the manuscript.

Corresponding author

Correspondence to Dinesh Kalyanasundaram.

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The authors have no conflict of interest in this work.

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Sikidar, A., Marieswaran, M. & Kalyanasundaram, D. Estimation of forces on anterior cruciate ligament in dynamic activities. Biomech Model Mechanobiol 20, 1533–1546 (2021). https://doi.org/10.1007/s10237-021-01461-5

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  • DOI: https://doi.org/10.1007/s10237-021-01461-5

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