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The pendulum test for evaluating spasticity of the elbow joint
Chou-Ching Lin1, Ming-Shaung Ju, Chun-Wang Lin
1Department of Neurology, University Hospital, Tainan, Taiwan. cxl45@mail.ncku.edu.tw
Archives of Physical Medicine and Rehabilitation
|February 18, 2003
Summary
This study modified the pendulum test to objectively evaluate elbow spasticity. The damping ratio effectively indicated increased spasticity in stroke patients.
Area of Science:
- Biomedical Engineering
- Rehabilitation Medicine
- Neurology
Background:
- Elbow spasticity assessment is challenging due to forearm inertia and patient posture.
- Conventional pendulum tests are difficult to apply directly to the elbow joint.
Purpose of the Study:
- To develop a modified pendulum test for objective elbow spasticity evaluation.
- To create an elbow biomechanical model for quantifying spasticity.
Main Methods:
- Designed a clock pendulum-like apparatus and an elbow biomechanical model (linear stiffness, damping, gravity).
- Used optimization techniques to estimate model parameters indicating spasticity.
- Evaluated 11 stroke patients and 11 able-bodied subjects.
Main Results:
- Stiffness remained consistent across groups.
- Damping coefficient and damping ratio increased in stroke patients' affected elbows.
- Damping ratio showed better differentiation of spasticity than the damping coefficient.
Conclusions:
- The damping ratio derived from the modified pendulum test effectively differentiates elbow spasticity from normotonus.
- The damping ratio correlates with spasticity severity in stroke patients.