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Pushrim forces and joint kinetics during wheelchair propulsion
R N Robertson1, M L Boninger, R A Cooper
1Department of Orthopaedic Surgery, School of Health and Rehabilitation Sciences, University of Pittsburgh, USA.
Archives of Physical Medicine and Rehabilitation
|September 1, 1996
Summary
Experienced wheelchair users exhibit distinct propulsion patterns, applying lower peak forces over longer durations to potentially reduce joint strain and enhance efficiency. This study differentiates their biomechanics from inexperienced users.
Area of Science:
- Biomechanics
- Human Engineering
- Rehabilitation Engineering
Background:
- Manual wheelchair propulsion involves complex upper extremity movements.
- Understanding forces and joint kinetics is crucial for preventing overuse injuries.
- Differences in propulsion techniques exist between experienced and inexperienced users.
Purpose of the Study:
- To investigate pushrim forces and joint kinetics during wheelchair propulsion.
- To compare biomechanical differences between experienced and inexperienced wheelchair users.
Main Methods:
- A cohort study involving manual wheelchair users and non-disabled individuals.
- Subjects propelled a wheelchair on a stationary dynamometer with force-sensing pushrims.
- Analysis of radial (Fr) and tangential (Ft) pushrim forces, and net joint forces/moments.
Main Results:
- Tangential forces (66-95N) were higher than radial forces (34-39N).
- Shoulder joint moments were greater than elbow or wrist moments.
- Experienced users demonstrated significantly lower peak tangential and vertical forces with longer times to peak compared to inexperienced users.
Conclusions:
- Propulsion force-time curve variables can differentiate wheelchair users from nonusers.
- Experienced users' propulsion patterns may minimize joint forces, potentially reducing injury risk and maximizing efficiency.
- Further research is needed on 3D forces and varying propulsion conditions to fully understand injury mechanisms.