Journal
PROSTHETICS AND ORTHOTICS INTERNATIONAL
Volume 35, Issue 2, Pages 140-149Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/0309364611409002
Keywords
Biomechanics of prosthetic/orthotic devices; prosthetic design; rehabilitation of amputees; testing of prosthetic and orthotic components
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Funding
- Australian Research Council [DP0345667, LP0455481]
- Queensland University of Technology
- University of Quebec in Montreal
- Australian Research Council [DP0345667, LP0455481] Funding Source: Australian Research Council
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Background: Calculation of lower limb kinetics is limited by floor-mounted force-plates. Objectives: Comparison of hip joint moments, power and mechanical work on the prosthetic limb of a transfemoral amputee calculated by inverse dynamics using either the ground reactions (force-plates) or knee reactions (transducer). Study design: Comparative analysis. Methods: Kinematics, ground reaction and knee reaction data were collected using a motion analysis system, two force-plates, and a multi-axial transducer mounted below the socket, respectively. Results: The inverse dynamics using ground reaction underestimated the peaks of hip energy generation and absorption occurring at 63% and 76% of the gait cycle (GC) by 28% and 54%, respectively. This method also overestimated by 24% a phase of negative work at the hip (37%-56% GC), and underestimated the phases of positive (57%-72% GC) and negative (73%-98%GC) work at the hip by 11% and 58%, respectively. Conclusions: A transducer mounted within the prosthesis has the capacity to provide more realistic kinetics of the prosthetic limb because it enables assessment of multiple consecutive steps and a wide range of activities without the issue of foot placement on force-plates.
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