Abstract
The purpose of this study was development of the 4D gait analysis system with the locus of center of pressure on sole of foot and to compare between pre and post-operative high tibial osteotomy. The subject of this study was a patient with medial compartment osteoarthritis of the varus knee. The data of pre and post-operative walking were acquired using a 4-dimensional motion analysis system combined CT images, motion capture data, and force plate data. The center of pressure on sole of foot was acquired from the force plate data according to reaction-oriented coordinate system. The locus of center of pressure on sole of foot was showed on the photograph as mirror image of the foot by matching the spherical skin marker around the foot of the Vicon coordinate system and the spherical skin marker on the photograph of sole of foot. The coordinate system on sole of foot was defined on the photograph based on the center of the 2nd metatarsal head and the center of the heel. The pre-operative locus of center of pressure on sole of foot passed through slightly lateral side on sole of foot. The post-operative locus of center of pressure on sole of foot passed through slightly medial side on sole of foot.
