Anterior Cruciate Ligament Reconstruction With a Quadrupled Hamstring Autograft Does Not Restore Tibial Rotation

As a result of the morbidity associated with anterior cruciate ligament (ACL) reconstruction with a bone–patellar–tendon– bone graft, many orthopaedic surgeons prefer hamstrings as the graft for ACL reconstruction. However, this selection is not based on solid scientific evidence. In vitro research shows that this graft cannot restore control of tibial rotation. Our recent in vivo research work has also demonstrated the same result. In particular, patients undergoing ACL repair who were reconstructed with a quadrupled hamstring tendon graft showed excessive tibial rotation during a dynamic activity when compared with healthy control subjects. Although the hamstring tendon graft has a more advantageous biomechanical profile than other grafts, it seems that it could not replicate the normal ACL regarding its actual anatomy and functional rotational abilities. The improvement and development of new surgical procedures and grafts seems to be the only way to address this problem of excessive tibial rotation. We also propose that the inability of current operative techniques to restore tibial rotation to normal preinjury levels can be the cause of future pathology and osteoarthritis found in ACL-reconstructed patients in the long-term. Abnormal rotational movements could result in loading of the knee cartilage in areas that are not commonly loaded in a healthy knee. These areas resulting from insufficient cartilage thickness may not be able to withstand the newly introduced loading and, over time, knee osteoarthritis is developed

Anterior cruciate ligament reconstruction with a quadrupled hamstrings tendon autograft does not restore tibial rotation to normative levels during landing from a jump and subsequent pivoting

Aim. Recent research suggested that the anterior curciate ligament (ACL) reconstruction does not restore tibial rotation to normal levels when a bone patellar tendon bone (BPTB) graft is used during high demanding activities. Our goal was to determine if the usage of an alternative graft, as the quadrupled semitendinosus-gracilis (ST/G), restore tibial rotation to normal values in a population of athletically active individuals while performing a usual for their sport activity. Methods. Eleven subjects, all reconstructed with an ST/G graft, were assessed in vivo, 9 months postoperatively, while they jumped off a 40 cm platform, landed on the ground and subsequently pivoted at 90 degrees. The evaluation period was identified from initial foot contact with the ground, included the pivoting of the ipsilateral leg, and was completed upon touch-down of the contralateral leg. By that time the patients had already returned to their sports activities. Results. The maximum range of motion of the tibial rotation for the pivoting leg, during the evaluation period was found significantly (P=0.0001) larger in the reconstructed leg as compared to the intact contralateral, although both clinical and arthrometer assessments revealed restoration of anterior translation. Conclusion. It was concluded that ACL reconstruction with an ST/G graft does not restore tibial rotation to normal levels during this high demanding activity. It seems that new surgical techniques are needed to better replicate the actual anatomy and function of the natural ACL in order to address this problem