We modified the musculoskeletal model developed by Catelli et al. (1) by including the knee mechanism introduced by Lerner et al. (2) for separately estimating the medial and lateral tibiofemoral joint contact forces. We also replaced the wrapping surface for the knee extensor muscles with a separate surface for each of the muscles for improving the estimation of the knee joint contact forces. This modification was executed to better replicate the moment arm proposed by Bakenecker et al. (3), which was based on different moment arm functions presented in the current literature and validated using in vivo measurements. Further details regarding the model can be found in the supplementary material (4).

(1) Catelli DS, Wesseling M, Jonkers I, Lamontagne M. A musculoskeletal model customized for squatting task. Computer Methods in Biomechanics and Biomedical Engineering. 2019.
(2) Lerner ZF, DeMers MS, Delp SL, Browning RC. How tibiofemoral alignment and contact locations affect predictions of medial and lateral tibiofemoral contact forces. Journal of Biomechanics. 2015.
(3) Bakenecker P, Raiteri B, Hahn D. Patella tendon moment arm function considerations for human vastus lateralis force estimates. Journal of Biomechanics. 2019.
(4) Bosch Will, Esrafilian Amir, Vartiainen Paavo, Arokoski Jari, Korhonen Rami K., Stenroth Lauri. Alterations in the Functional Knee Alignment Are Not an Effective Strategy to Modify the Mediolateral Distribution of Knee Forces During Closed Kinetic Chain Exercises. Journal of Applied Biomechanics. 2022.