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Appl. Sci. 2017, 7(9), 926; doi:10.3390/app7090926

Detecting Anatomical Leg Length Discrepancy Using the Plug-in-Gait Model

1
Gait and Motion Analysis Laboratory, Department of Pediatric Orthopaedics, Dana Children’s Hospital, Tel Aviv Sourasky Medical Center, 6, Weizman St., Tel Aviv 64239, Israel
2
Department of Physical Therapy, University of Haifa, Haifa 31000, Israel
3
Department of Pediatric Orthopaedics, Dana Children’s Hospital, Tel Aviv Sourasky Medical Center, 6, Weizman St., Tel Aviv 64239, Israel
4
Sackler Faculty of Medicine, Tel-Aviv University, Ramat Aviv 69978, Israel
5
Physical Therapy Department, Faculty of Health Sciences Ariel University, Ariel 40700, Israel
*
Author to whom correspondence should be addressed.
Received: 12 August 2017 / Revised: 4 September 2017 / Accepted: 4 September 2017 / Published: 8 September 2017
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Abstract

Leg length discrepancy (LLD) is a significant factor influencing several pathological conditions. Gait analysis is based on biomechanical gait models calculating joint kinematics; however, no previous study has validated its ability to detect anatomical LLD. The aim of the present study was to compare the validity of the Vicon® Plug-in-Gait-model (PGM) in measuring femur and tibia segmental length discrepancy with measurements attained by X-ray. Fifteen participants with suspected leg length discrepancies underwent a lower limb X-ray and a standing calibration trial using a motion analysis system (Vicon®, Oxford Metrics, UK). Femur and tibia segment lengths were deducted from both measurements. No differences were found when measuring the discrepancies between sides for the femur (p = 0.3) and tibia (p = 0.45) segmental length. A high correlation was found between methods (r = 0.808–0.962, p < 0.001), however, a significant difference was observed when measuring the femur and tibia length (p < 0.0001). PGM was found to be a valid model in detecting segmental length discrepancy when based on the location of the joint centers compared to X-ray. A variance was noted in the femur and tibial segmental length. The impact of this inconsistency in segmental length on kinematics and kinetics should be further evaluated. View Full-Text
Keywords: gait model; Plug-in-Gait; joint center; segmental length gait model; Plug-in-Gait; joint center; segmental length
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Khamis, S.; Danino, B.; Springer, S.; Ovadia, D.; Carmeli, E. Detecting Anatomical Leg Length Discrepancy Using the Plug-in-Gait Model. Appl. Sci. 2017, 7, 926.

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