Knee medial and lateral contact forces computed along subject-specific contact point trajectories
DUMAS ; ZEIGHAMI ; AISSAOUI
Type de document
COMMUNICATION AVEC ACTES INTERNATIONAL (ACTI)
Langue
anglais
Auteur
DUMAS ; ZEIGHAMI ; AISSAOUI
Résumé / Abstract
Knee medial and lateral contact forces estimated from musculoskeletal modelling depend on the location of contact points. Patient-specific contact point trajectories can be obtained from weight-bearing medical imaging systems which give access to both joint anatomy and joint alignment either in a set of postures (i.e. pseudo-kinematics) or during a continuous movement. The medial and lateral contact point trajectories are obtained during quasi-static squat for 10 healthy and 12 severe osteoarthritis (OA) subjects using biplane low-dose radiography. The contact forces are estimated using a lower limb musculoskeletal model at each point of the trajectories corresponding to a given knee flexion angles during gait. The contact forces were generally found slightly lower in OA subjects and applied more medially on the tibial plateaus but with high inter-subject variability. The positions of the medial contact points were ones of the linear predictors (together with external knee moments) of the amplitude of the medial contact force. The lower limb musculoskeletal model with generic contact points has been previously validated with data from instrumented prosthesis. Updated validation of the model taking into account subject-specific prosthetic contact points is currently under progress.
