A Biomechanical Study of Replacement of the Posterior Cruciate Ligament with a Graft PART II: FORCES IN THE GRAFT COMPARED WITH FORCES IN THE INTACT LIGAMENT*

摘要: A femoral load-cell was installed in twelve fresh-frozen knee specimens from cadavera, to measure the resultant force at origin of posterior cruciate ligament during a series tibial-loading tests. The removed, and ten-millimeter-wide bone-patellar ligament-bone graft inserted. flexed 90 degrees, pre-tensioned restore anterior-posterior laxity that recorded after installation load-cell, loading tests were repeated. With tibia locked neutral rotation 200-newton applied tibia, mean generated intact ranged 220 newtons degrees flexion thirty-six full extension. When external drawer test, reduced when 10 70 degrees; internal rotation, only 30 45 flexion. forces not significantly different, with numbers available, corresponding values for application straight tibial (neutral rotation), fifteen-newton-meter or extension moment (hyperflexion hyperextension), ten-newton-meter varus valgus moment, torque. there no significant differences between rotations associated those any angle flexion, without CLINICAL RELEVANCE: amount test depends on which is performed. near all transmitted affected by position rotation. performed an other structures (such as collateral ligaments part capsule) help resist tibia. important secondary torque act reduce carried even more. few minor exceptions, we found used replace approximately same ligament. Therefore, appears be little justification restricting low-level rehabilitation activities once fixation has healed. However, could quite high hyperextension hypertension, they are Thus, bracing early postoperative period may advisable prevent these motions.