Strain measurement at the knee ligament insertion sites

We describe the modification of an existing method of ligament
strain measurement at the knee joint in detail. At ten fresh joint
specimens we used that technique where strain gauges are attached
to the ligamentous insertions and origins. We both improved the
preparation of the attachment site and the application of the
strain gauges. In a special apparatus the specimens were moved from
0degrees extension to 100degrees flexion while simulating muscle
strength and axial force. Testing was performed at the posterior
cruciate ligament with both intact and transsected anterior
cruciate ligament. In contrast to other existing techniques it does
not affect the motion of the joint or the integrity and the
function of the ligaments. Unlike the original description of that
method we could register a loading behaviour of the posterior
cruciate ligament that is similar to those reported in the
literature.