Mass and mass distribution of below-knee prostheses: effect on gait efficacy and self-selected walking speed
Deutscher übersetzter Titel: | Masse und Massenverteilung von Unterschenkelprothesen: Auswirkung auf die Oekonomie des Gehens und die bevorzugte Gehgeschwindigkeit |
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Autor: | Lehmann, J.F.; Price, R.; Okumura, R.; Questad, K.; Lateur, B.J. de; Negretot, A. |
Erschienen in: | Archives of physical medicine and rehabilitation |
Veröffentlicht: | 79 (1998), 2, S. 162-168, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource |
Sprache: | Englisch |
ISSN: | 0003-9993, 1532-821X |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU199805301802 |
Quelle: | BISp |
Abstract des Autors
Objective: To study mass and mass distribution effect on function of below-knee prostheses. Design: Design modifications were done to produce proximal center of mass location versus distal center of mass location variations, and prosthesis weight was modified from 42% to 70% of normal limb weight. Work across joints of affected and unaffected extremities was compared to assess the ability of the prosthesis to substitute for function loss. Setting: University biomechanics laboratory. Participants: Fifteen volunteers with below-knee amputations, residual limb length greater than 8.3 cm, but excluding Syme amputations. Interventions: Patients walked with all configurations at self-selected walking speeds and 120 m/min. Main Outcome Measures: Self-selected walking speed and metabolic efficiency. Work across the joints of affected and unaffected sides was compared. Results: Proximal center of mass location produced a more efficient gait. Weight change from 42% to 70% of normal had no significant effect. Mechanical studies show that the prosthesis is a relatively poor substitute for the normal limb; most work is done by the nonamputated side. Particularly, the prosthesis failed to produce effective forward impulses on the body, resulting from push-off and deceleration of the swing leg. Conclusions: For a proximal center of mass, lightweight distal components (eg, feet) should be used; it is questionable whether further expenditure to develop ultralightweight prostheses would be cost effective for level walking. Verf.-Referat