PNF and Movement 2019; 17(3): 391-399
https://doi.org/10.21598/JKPNFA.2019.17.3.391
Effect of Artificial Leg Length Discrepancy on 3D Hip Joint Moments during Gait in Healthy Individuals
Min-Ji Jo⋅Dong-Hyun Kim⋅Dong-Wook Han⋅Eun-Jin Choi⋅Ye-Seul Kim⋅Yong-Wook Kim, P.T., Ph.D
Department of Physical Therapy, Joenju University
Correspondence to: Yong-Wook Kim (ptkim@jj.ac.kr)
Received: July 17, 2019; Revised: August 20, 2019; Accepted: August 20, 2019; Published online: December 31, 2019.
© Korea Proprioceptive Neuromuscular Facilitation Association. All rights reserved.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Purpose: This study investigated the three-dimensional moment values of the hip joint for subjects with artificial leg length alterations and subjects with unaltered leg lengths.
Methods: Forty-two healthy adults (8 men, 34 women) participated in this study. The selected subjects were able to walk normally, had less than a 1 cm leg length discrepancy, and were instructed to wear shoes that fit their feet. The study participants performed 8 dynamic gait trails to measure the hip joint moment using a three-dimensional motion analysis system. Kinetic and dynamic three-dimensional gait analysis data were collected from infrared cameras, and a force plate was used to standardize the weight of each subject.
Results: There were significant correlations between the differences in the leg length discrepancy during right extension, right flexion, right internal rotation, and left extension in hip joint moments (p<0.05). There were significant correlations between the differences in shoe conditions during left extension, right flexion, right extension, and right internal rotation in the hip moments (p<0.05).
Conclusion: This study suggests that a leg length discrepancy can affect hip joint moment, which may further exacerbate musculoskeletal disorders, such as osteoarthritis in lower extremity joints. Therefore, further studies should be conducted to verify the impact of clinical interventions on differences in hip joint moment values to correct leg length discrepancies and prevent osteoarthritis in lower extremity joints.
Keywords: Gait, Hip joint moment, Leg length inequality


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