Joint laxity measurement

Details Joint laxity measurement Joint laxity measurement

1985-06-07

1987-03-17

Howell, Kyle L.

Surgery

Truss

Pad

128774, A61B 510

Patent

active

046499342

ABSTRACT:
A method for measuring parameters relating to the stability of joints in a patient's body includes the steps of securing a reference portion of the joint (that portion of the joint closest to the body) to a fixed location. A three dimensional digitization of the size, shape, position and coordinate system of the two portions is performed. A soft tissue compensation procedure is performed by applying forces to the reference portion of the joint to thereby determine the amount of reference portion motion, in the soft tissue surrounding the reference portion, due to these forces. A variety of forces are applied to the relative portion of a joint, which is movable relative to the reference portion thereof, and the total motion of the reference and relative portions associated with the forces are measured. By subtracting the motion determined in the soft tissue compensation from motion as determined by applying a variety of forces, the motion of only the relative portion relative to the reference portion is determined.

REFERENCES:
patent: 4549555 (1985-10-01), Fraser et al.
patent: 4571834 (1986-02-01), Fraser et al.
patent: 4583555 (1986-04-01), Malcom et al.
"Genucom"; Far Orthopedics, 11/19/84.
Townsend et al; "Total Motion Knee Goniometry"; J. Biomechanics, vol. 10, No. 3, 1977, pp. 183-193.
Gransberg et al; "A Computer Programmed System for the Analysis of Active and Passive Isokinetic Movements"; IEEE 1980 Frontiers of Engr. in Health Care, 9-1980, pp. 28-30.

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