Method and apparatus for measurement of joint stiffness

Details Method and apparatus for measurement of joint stiffness Method and apparatus for measurement of joint stiffness

1990-04-17

1991-09-24

Kamm, William E.

Surgery

Truss

Pad

128782, A61B 5103

Patent

active

050506188

ABSTRACT:
A method and apparatus for body joint rotation and measurement to isolate the joint under test is characterized by imposing movement on one member of the joint in a series of discrete increments, whereupon strain is measured at rest over a predetermined range of motion. Measurement of static force v. displacement at each of a plurality of steps in the angular range provides a quantitative test and evaluation of the elastic component of joint stiffness that resists the applied angular displacement. In this way, a static stress-strain loop is produced for each plane of movement. The static modulus of elasticity is derived by the slope of the stress-strain loop at the extremes of the range of motion.

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Lehmann; "Spasticity: Quantitative Measurements as a Basis for Assessing Effectiveness of Therapeutic Intervention"; Jan. 1989; pp. 6-15.
Wright; "Quantitative and Qualitative Analysis of Joint Stiffness in Normal Subjects and in Patients with Connective Tissue Diseases"; 1961; pp. 36-45.

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