van der Harst J J, Gokeler A, Hof A L
Center for Human Movement Sciences, University Medical Center Groningen, P.O. Box 196, 9700 AD Groningen, The Netherlands.
Clin Biomech (Bristol). 2007 Jul;22(6):674-80. doi: 10.1016/j.clinbiomech.2007.02.007. Epub 2007 Apr 6.
Anterior cruciate ligament (ACL) deficiency can be a major problem for athletes and subsequent reconstruction of the ACL may be indicated if a conservative regimen has failed. After ACL reconstruction signs of abnormality in the use of the leg remain for a long time. It is expected that the landing after a single-leg hop for distance (horizontal hop) might give insight in the differences in kinematics and kinetics between uninjured legs and ACL-reconstructed legs. Before the ACL-reconstructed leg can be compared with the contralateral leg, knowledge of differences between legs of uninjured subjects is needed.
Kinematic and kinetic variables of both legs were measured with an optoelectronic system and a force plate and calculated by inverse dynamics. The dominant leg (the leg with biggest horizontal hop distance) and the contralateral leg of nine uninjured subjects were compared.
No significant differences were found in most of the kinematic and kinetic variables between dominant leg and contralateral leg of uninjured subjects. Only hop distance and hip extension angles differed significantly.
This study suggests that there are no important differences between dominant leg and contralateral leg in healthy subjects. As a consequence, the uninvolved leg of ACL-reconstructed patients can be used as a reference. The observed variables of this study can be used as a reference of normal values and normal differences between legs in healthy subjects.
前交叉韧带（ACL）损伤对运动员来说可能是个大问题，如果保守治疗方案失败，可能需要进行ACL重建。ACL重建后，腿部使用中的异常迹象会长期存在。预计单腿跳远（水平跳跃）后的落地动作可能有助于了解未受伤腿部与ACL重建腿部在运动学和动力学上的差异。在将ACL重建的腿部与对侧腿部进行比较之前，需要了解未受伤受试者两腿之间的差异。
使用光电系统和测力板测量双腿的运动学和动力学变量，并通过逆动力学进行计算。比较了9名未受伤受试者的优势腿（水平跳跃距离最大的腿）和对侧腿。
未受伤受试者的优势腿和对侧腿在大多数运动学和动力学变量上没有显著差异。只有跳跃距离和髋关节伸展角度有显著差异。
本研究表明健康受试者的优势腿和对侧腿之间没有重要差异。因此，ACL重建患者的未受伤腿可以作为参考。本研究观察到的变量可作为健康受试者腿部正常值和正常差异的参考。
