Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/16771
Title: Individual responses to alignment perturbations in socket reaction moments while walking in transtibial prostheses
Authors: Kobayashi, T
Orendurff, MS
Zhang, M 
Boone, DA
Keywords: Amputation
Direct measurement
Gait
Kinetic
Malalignment
SACH foot
Issue Date: 2014
Publisher: Pergamon Press
Source: Clinical biomechanics, 2014, v. 29, no. 5, p. 590-594 How to cite?
Journal: Clinical biomechanics 
Abstract: Background The alignment of transtibial prostheses has a systematic effect on the mean socket reaction moments in amputees. However, understanding their individual differences in response to alignment perturbations is also important for prosthetists to fully utilize the socket reaction moments for dynamic alignment in each unique patient. The aim of this study was to investigate individual responses to alignment perturbations in transtibial prostheses with solid-ankle-cushion-heel feet. Methods A custom instrumented prosthesis alignment component was used to measure the socket reaction moments while walking in 11 amputees with transtibial prostheses under 17 alignment conditions, including 3° and 6° of flexion, extension, abduction, and adduction of the socket, 5 mm and 10 mm of anterior, posterior, lateral, and medial translation of the socket, and an initial baseline alignment. Coronal moments at 30% of stance and maximum sagittal moments were extracted for comparisons from each amputee. Findings In the coronal plane, varus moment at 30% of stance was generally reduced by adduction or medial translation of the socket in all the amputees. In the sagittal plane, extension moment was generally increased by posterior translation or flexion of the socket; however, this was not necessarily the case for all the amputees. Interpretations Individual responses to alignment perturbations are not always consistent, and prosthetists would need to be aware of this variance when addressing individual socket reaction moments during dynamic alignment in clinical setting.
URI: http://hdl.handle.net/10397/16771
ISSN: 0268-0033
EISSN: 1879-1271
DOI: 10.1016/j.clinbiomech.2014.04.002
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