【摘要】 8个膝关节截肢标本在模拟在负荷屈曲情况下测定稳定膝关节时股四头肌张力。发现该肌张力与负荷大小及膝关节屈曲度成正比相关。屈曲15°时约是负荷的1倍,45°时约是负荷的3～4倍。髌骨切除后该力增加10～40％,而胫骨结节抬高1.5cm该力减少了11～19％,因为后者力臂增长。抬高后股四头肌腱与髌腱的夹角平均增加10.7°。采用染色法确定O°～135°髌股关节接触区。胫骨结节抬高后接触面上移,面积增大。 由于胫骨结节抬高术能使伸膝力臂加长、增加股四头肌腱和髌腱问的夹角并增加髌股关节接触面,减少髌股关节的接触应力,因此应用此手术治疗髌股关节疾患可能是一种满意方法。更多还原

【Abstract】 Eight specimens of the knee were used to determine quadriceps force (FQ) required to stabilize the knee under load in a flexed stance.It was found that there was a positive relationship between quadriceps force and the weight and flexion of the knee .At flexion of 15° FQ was about the same as the weight; at 45°,about 3-4 times the weight.FQ increased by 10-40% after patele ctomy, while anterior displacement of the tibial tubercle by 1.5cm led to 11%-19% decrease because of its pro- longed lever arm. It widened the angle formed by the qudriceps tendon and the patellar tendon by an average of 10.7 degrees.The contact areas of the patellofemoral joint at flexion of 0-135 ° were determined by contact prints.Following anterior displacement of the tibial turbercle, contact areas were upwardly shifted and enlarged.Our results show that this procedure can decrease the patellofemoral contact stress by lengthening the lever arm of FQ, widening the angle formed by the guad-riceps tendon and patellar tendon and enlarging contact areas of the patellofemoral joint. We recommend it as a possible satisfactory treatment for the patellofemoral joint disorders更多还原