Evaluation of the Validity, Reliability, and Kinematic Characteristics of Multi-Segment Foot Models in Motion Capture

Abstract

This study aimed to evaluate the validity and reliability of our new multi-segment foot model by measuring a dummy foot, and examine the kinematic characteristics of our new multi-segment foot model by measuring the living body. Using our new model and the Rizzoli model, we conducted two experiments with a dummy foot that was moved within a range from −90 to 90 degrees in all planes; for the living body, 24 participants performed calf raises, gait, and drop jumps. Most three-dimensional (3D) rotation angles calculated according to our new models were strongly positively correlated with true values (r > 0.8, p < 0.01). Most 3D rotation angles had fixed biases; however, most of them were in the range of the limits of agreement. Temporal patterns of foot motion, such as those in the Rizzoli model, were observed in our new model during all dynamic tasks. We concluded that our new multi-segment foot model was valid for motion analysis and was useful for analyzing the foot motion using 3D motion capture during dynamic tasks.

Using surface markers to describe the kinematics of the medial longitudinal arch

“…Since this study evaluated a novel method for characterising the MLA, with no previous data available, a formal a priori sample size calculation could not be performed. However, the sample size used in this study (60 feet from 30 participants) is in agreement with comparable studies in the literature [9,[19][20][21].…”

Intrinsic Kinematics of the Tibiotalar and Subtalar Joints during Human Walking based on Dynamic Biplanar Fluoroscopy

“…During the past decades, numerous studies have been conducted on AJC kinematics. Among them, Optical Motion Capture (OMC) techniques and multisegmental foot models have been widely used in related research [7][8][9][10][11][12][13]; however, accurate measurement of the 3D motion of the tibiotalar and subtalar using the OMC is difficult to achieve because of the difficulty in placing the corresponding landmarks of the hindfoot [14,15]. In particular, the talus is surrounded by ligaments and muscles and lacks external markers, making it difficult to accurately measure its movement with skin markers.…”