Knee ligament testing system

Details Knee ligament testing system Knee ligament testing system

1983-01-03

1986-04-22

Howell, Kyle L.

Surgery

Truss

Pad

A61B 510

Patent

active

045835551

ABSTRACT:
A tibia-referenced system for objectively testing the integrity of the anterior and posterior cruciate ligaments of the knee with passive drawer, active drawer, and end point tests. Two simplified forms of the invention embody an elongated reference arm with a distal end pad that is fulcrumed against a distal region on the tibia and a proximal reference pad that rests on either the tibial tubricle or patellar bone structure, while a displacement indicator rod slidably mounted on the arm carries another proximal reference pad that rests on the other of these two bone structures adjacent the knee joint. In a third form of intermediate complexity, the second reference structure, instead of the indicator rod, is a second elongated reference arm distally pivotally connected to the other reference arm, each of the two arms carrying a reference pad that rests on a respective one of the tibial tubricle and pateller bone structures; and in this form the relative angular pivotal positions of the arms is translated to a displacement indicator dial that provides a direct readout of anterior or posterior drawer shift. The fourth and most complex form of the invention has the distally pivoted reference arms and direct readout displacement indicator dial of the third form, and further includes a case in which the arms are pivoted that is strapped against the tibia, with a force-applying handle extending anteriorly of the case and a force-indicating transducer operatively arranged between the handle and the case to audibly indicate predetermined applied force levels.

REFERENCES:
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patent: 1944601 (1934-01-01), Gulick
patent: 1976045 (1934-10-01), Sorenson
patent: 2107534 (1938-02-01), Houser
patent: 4470810 (1984-09-01), Bourdeau et al.
Torg et al., Amer. J. of Sports Med., vol. 4, No. 2, Mar./Apr. 1976, pp. 84-93.
Markolf et al., J. of Bone and Joint Surgery, vol. 60-A, No. 5, Jul. 1978, pp. 664-674.
Kennedy et al., J. of Bone and Joint Surgery, vol. 53-A, 1971, pp. 1257-1270.
Crowninshield et al., J. of Biomechanics, vol. 9, 1976, pp. 529-535.

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