Toshiki Kobayashi1, Adam K Arabian2, Michael S Orendurff3, Teri G Rosenbaum-Chou3, David A Boone3. 1. Orthocare Innovations, Mountlake Terrace, WA, USA. Electronic address: tkobayashi@orthocareinnovations.com. 2. Department of Engineering and Computer Science, Seattle Pacific University, WA, USA. 3. Orthocare Innovations, Mountlake Terrace, WA, USA.
Abstract
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 5mm, 10mm and 15mm (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.
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 5mm, 10mm and 15mm (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.
Authors: David A Boone; Toshiki Kobayashi; Teri G Chou; Adam K Arabian; Kim L Coleman; Michael S Orendurff; Ming Zhang Journal: J Rehabil Res Dev Date: 2012
Authors: Toshiki Kobayashi; Michael S Orendurff; Adam K Arabian; Teri G Rosenbaum-Chou; David A Boone Journal: J Biomech Date: 2014-02-14 Impact factor: 2.712
Authors: Brandon T Nguyen; Nick A Baicoianu; Darrin B Howell; Keshia M Peters; Katherine M Steele Journal: Prosthet Orthot Int Date: 2020-04-21 Impact factor: 1.895
Authors: Matthew M Wernke; Evandro M Ficanha; Zac Thomas; Murray E Maitland; Katheryn J Allyn; Alex Albury; James Colvin Journal: J Rehabil Assist Technol Eng Date: 2022-09-07