Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Tytuł pozycji:

Moment arm of the knee-extensor mechanism measured in vivo across a range of daily activities.

Tytuł:
Moment arm of the knee-extensor mechanism measured in vivo across a range of daily activities.
Autorzy:
Gray HA; Dept of Mechanical Engineering, University of Melbourne, Victoria 3010, Australia.
Guan S; Dept of Mechanical Engineering, University of Melbourne, Victoria 3010, Australia.
Thomeer LT; Dept of Mechanical Engineering, University of Melbourne, Victoria 3010, Australia.
Pandy MG; Dept of Mechanical Engineering, University of Melbourne, Victoria 3010, Australia. Electronic address: .
Źródło:
Journal of biomechanics [J Biomech] 2021 Jun 23; Vol. 123, pp. 110484. Date of Electronic Publication: 2021 Apr 30.
Typ publikacji:
Journal Article; Research Support, Non-U.S. Gov't
Język:
English
Imprint Name(s):
Original Publication: New York ; Oxford : Elsevier Science
MeSH Terms:
Patella*
Patellar Ligament*
Biomechanical Phenomena ; Femur ; Humans ; Knee Joint ; Range of Motion, Articular
Contributed Indexing:
Keywords: Effective moment arm; Patellar tendon; Patellofemoral; Quadriceps; Screw axis; Tibiofemoral
Entry Date(s):
Date Created: 20210601 Date Completed: 20210701 Latest Revision: 20210701
Update Code:
20240105
DOI:
10.1016/j.jbiomech.2021.110484
PMID:
34062347
Czasopismo naukowe
We measured the moment arm of the knee-extensor mechanism as ten healthy young individuals performed six functional activities: level walking, downhill walking, stair ascent, stair descent, open-chain (non-weight-bearing) knee flexion, and open-chain knee extension. The moment arm of the knee-extensor mechanism was described by the moment arm of the patellar-tendon force, which acts to rotate the tibia about the instantaneous axis of rotation (screw axis) of the knee. A mobile biplane X-ray imaging system enabled simultaneous measurements of the three-dimensional movements of the femur, tibia and patella during each activity, from which the position and orientation of the screw axis and the patellar-tendon moment arm (PTMA) were determined. Mean PTMA across all activities and all participants remained nearly constant (~46 mm) from 0° to 70° of knee flexion and decreased by no more than 20% at higher flexion angles. The magnitude of the PTMA varied more substantially across individuals than across activities, indicating that the moment arm is more heavily influenced by differences in knee-joint geometry than muscle loading. Hence, PTMA measurements obtained for a given activity performed by one individual may be used with good confidence to describe the PTMA for any other activity performed by the same individual. Caution is advised when using PTMA measurements obtained from one individual to describe the moment arm in another individual even once the data are normalized by knee bone size, as the PTMA varied by as much as 13% from the mean across individuals.
(Copyright © 2021 Elsevier Ltd. All rights reserved.)

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies