股四头肌腱与髌韧带张力关系的生物力学研究

本实验使用扣带式传感器对7例尸体膝关节在生理Q角、Q角增大10°、Q角减小10°和胫骨结节抬高术四种状态下,从90°到0°的伸膝过程中7个屈膝角度时的髌韧带张力和股四头肌腱张力进行测试。不同于传统的观点,我们的实验结果表明:髌骨不是只改变股四头肌腱和髌韧带张力方向的简化滑轮结构。Fp/Fq随膝关节屈曲角度的变化而明显改变,这种比率关系是由髌股关节接触区部位的移行决定的。髌骨不仅按照一定的比率传递股四头肌力,而且还起着增大髌韧带张力伸膝力臂的作用。本文还就Q角改变和胫骨结节抬高术对伸膝装置力学机制的影响进行了探讨。

BIOMECHANICAL STUDY ON RELATIONSHIP BETWEEN FORCES IN THE QUADRICEPS TENDON AND THOSE IN LIGAMENTUM PATELLAE

Under four different conditions ( Physiological QA, Increased 10 degreesQA, Decreased 10 degrees QA and tibial tubercle elevation), forces in boththe ligmentum patellae and quadriceps tendon ( Fp and Fq ) were determinedusing Buckle Transducer at 7 knee flexion angles in seven cadaver knee join-ts. Contrary to traditional opinion, our results indicated that patella was nota simple pulley structure that serves only to change the direction of the equalforces in the quadriceps tendon and ligamentum patellae.The force ratios,de-termined by the changing location of patellofemoral contact area, varied sign-ificantly with knee flexion angle.The patella not only transmitted the force ofthe quadriceps according to certain ratios, but also was important in the in-crease of knee extension arm of Fp.The effects of Q-angle and tibial tubercleelevation on the knee extension mechanism were also discussed.