TY - JOUR
T1 - Effect of alignment changes on socket reaction moments while walking in transtibial prostheses with energy storage and return feet
AU - Kobayashi, Toshiki
AU - Arabian, Adam K.
AU - Orendurff, Michael S.
AU - Rosenbaum-Chou, Teri G.
AU - Boone, David A.
N1 - Funding Information:
This study was supported by the National Center for Medical Rehabilitation Research , National Institutes of Health , Grant numbers R43HD047119 and R44HD047119 .
PY - 2014/1
Y1 - 2014/1
N2 - Background Energy storage and return feet are designed for active amputees. However, little is known about the socket reaction moments in transtibial prostheses with energy storage and return feet. The aim of this study was to investigate the effect of alignment changes on the socket reaction moments during gait while using the energy storage and return feet. Methods A Smart Pyramid™ was used to measure the socket reaction moments in 10 subjects with transtibial prostheses while walking under 25 alignment conditions, including a nominal alignment (as defined by conventional clinical methods), as well as angle malalignments of 2, 4 and 6 (flexion, extension, abduction, and adduction) and translation malalignments of 5 mm, 10 mm and 15 mm (anterior, posterior, lateral, and medial) referenced from the nominal alignment. The socket reaction moments of the nominal alignment were compared with each malalignment. Findings Both coronal and sagittal alignment changes demonstrated systematic effects on the socket reaction moments. In the sagittal plane, angle and translation alignment changes demonstrated significant differences (P < 0.05) in the minimum moment, the moment at 45% of stance and the maximum moment for some comparisons. In the coronal plane, angle and translation alignment changes demonstrated significant differences (P < 0.05) in the moment at 30% and 75% of stance for all comparisons. Interpretation The alignment may have systematic effects on the socket reaction moments in transtibial prostheses with energy storage and return feet. The socket reaction moments could potentially be a useful biomechanical parameter to evaluate the alignment of the transtibial prostheses.
AB - Background Energy storage and return feet are designed for active amputees. However, little is known about the socket reaction moments in transtibial prostheses with energy storage and return feet. The aim of this study was to investigate the effect of alignment changes on the socket reaction moments during gait while using the energy storage and return feet. Methods A Smart Pyramid™ was used to measure the socket reaction moments in 10 subjects with transtibial prostheses while walking under 25 alignment conditions, including a nominal alignment (as defined by conventional clinical methods), as well as angle malalignments of 2, 4 and 6 (flexion, extension, abduction, and adduction) and translation malalignments of 5 mm, 10 mm and 15 mm (anterior, posterior, lateral, and medial) referenced from the nominal alignment. The socket reaction moments of the nominal alignment were compared with each malalignment. Findings Both coronal and sagittal alignment changes demonstrated systematic effects on the socket reaction moments. In the sagittal plane, angle and translation alignment changes demonstrated significant differences (P < 0.05) in the minimum moment, the moment at 45% of stance and the maximum moment for some comparisons. In the coronal plane, angle and translation alignment changes demonstrated significant differences (P < 0.05) in the moment at 30% and 75% of stance for all comparisons. Interpretation The alignment may have systematic effects on the socket reaction moments in transtibial prostheses with energy storage and return feet. The socket reaction moments could potentially be a useful biomechanical parameter to evaluate the alignment of the transtibial prostheses.
KW - Amputation
KW - Direct measurement
KW - Kinetics
KW - Load
KW - Malalignment
UR - http://www.scopus.com/inward/record.url?scp=84890858250&partnerID=8YFLogxK
U2 - 10.1016/j.clinbiomech.2013.11.005
DO - 10.1016/j.clinbiomech.2013.11.005
M3 - Journal article
C2 - 24315709
AN - SCOPUS:84890858250
SN - 0268-0033
VL - 29
SP - 47
EP - 56
JO - Clinical Biomechanics
JF - Clinical Biomechanics
IS - 1
ER -