Stability of the braced ankle: a biomechanical investigation
Deutscher übersetzter Titel: | Einfluss einer Sprunggelenkstuetze auf die Gelenkstabilitaet: eine biomechanische Analyse |
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Autor: | Thonnard, J.L.; Bragard, D.; Willems, P.A.; Plaghki, L. |
Erschienen in: | The American journal of sports medicine |
Veröffentlicht: | 24 (1996), 3, S. 356-361, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource |
Sprache: | Englisch |
ISSN: | 0363-5465, 1552-3365 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU199709207145 |
Quelle: | BISp |
Abstract des Autors
We measured the bare ankle and the braced angle-torque relationships in 12 uninjured volunteers under static and dynamic conditions within the full range of inversion motion. These relationships were measured with a specially designed mechanical device that allowed inversion movements with angular velocities up to 850 deg/sec. In testing the bare ankle under static conditions, the torque showed a 10-fold increase within the full range of motion (average, from 0.9 N-m at 7ø to about 8 N-m at 48ø of inversion). The slope of the angle-torque relationship increased under dynamic conditions giving higher torque values (up to 18 N-m on average). Both orthoses induced similar additional torques that increased linearly, up to about 6 N-m at 45ø, with higher angles of inversion. These additional torques are small compared with the amount of stress applied to the foot during a typical ankle sprain situation, such as recovering from a jump. Therefore, we propose that orthotic devices increase the ankle torque, counteracting the inversion movement, and also prevent the start of the inversion movement by preloading and maintaining the ankle in a proper anatomic position with optimal contact between the articular surfaces. Verf.-Referat