System for establishing ligament graft orientation and isometry

Details System for establishing ligament graft orientation and isometry System for establishing ligament graft orientation and isometry

1986-06-30

1987-12-15

Rosenbaum, C. Fred

Surgery

Truss

Perineal

128 92VK, 623 13, A61F 504

Patent

active

047125420

ABSTRACT:
A method and instrument for skeletal referenced isometric positioning and tensioning of a ligament graft, particularly during knee surgery involving the anterior cruciate and the posterior cruciate ligaments. The graft is extended from one fixation site and attached to a sled slidably carried by a frame which is skeletally mounted to the other fixation site. A thumb nut and lead screw assembly on the skeletally fixed frame is operative to compress a spring in the sled and move the sled in a direction effective to tension the graft. Isometry is achieved when the relative positions of the frame and sled indicate constant graft tension and displacement through the entire range of passive knee flexion. The sled can be fixed relative to the frame for evaluation of joint laxity.

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