The Validation of Musculoskeletal Model During Isokinetic Exercise at Knee Joint: An Experimental and Simulation Study

Bae, Tae Soo; Kang, Seung Jae; Choi, Kyung Joo; Kim, Shin Ki; Ryu, Wook Jae; Jin, Mi Ryeong; Mun, Mu Seong

Abstract

PURPOSE
This study validated the musculoskeletal model of the human lower extremity by comparative study between calculated muscle parameters through simulation using modified hill-type model and measured muscle parameters through isokinetic exercise. The relationship between muscle forces and moments participated in motion was quantified from the results of simulation.
MATERIALS AND METHODS
For simulation of isokinetic motion, a three-dimensional anatomical knee model was constructed using gait analysis. The EMG-force model was used to determine muscle activation level exciting muscles. The modified Hill-type model was used to calculate individual muscle force and moment in dynamic analysis. This method was validated by comparing analytical data with experimental data.
RESULTS
The results showed that there was a significant correlation between calculated torques from simulation and measured torque from isokinetic motion experiments (R=0.97). We also found that muscle forces and moments during knee flexion and extension have nonlinearly proportional or inversely proportional relationship, since lower extremity muscles were simultaneously involved in flexion/extension motion and inner/outer rotation.
CONCLUSION
We concluded that the simulation by using musculoskeletal model may be a useful mean to predict and recover musculoskeletal-related diseases, and analyze complicated experiment such as clash condition.