Pathological analysis for loss ofmuscle contraction after tendon transfer surgery

结果表明，肌腱移位手术牵张肌肉，肌节数目增加，但肌肉收缩的生理范围缩小。生理横截面积无变化，但肌肉收缩的主动张力降低。老年组肌腱组织的延伸性低于青年组，这进一步要求肌纤维伸长率和肌节数目增加。

It is revealed that the tendon transfer surgery in which muscle is stretched leads to an increase in sarcomere number but decrease in physiologic range of the muscle contraction. The active tension of the muscle contraction decreased despite no change in physiologic cross sectional area. It is also revealed that intramuscular connective tissue volume increased, which was thought to be related with the decrease in both physiologic range and in active tension.Intramuscular tendinous tissue had lower extensibility in aged group than that in young group, which further required muscle fiber elongation and sarcomere number increase.