Ketchum L D, Thompson D, Pocock G, Wallingford D
J Hand Surg Am. 1978 Nov;3(6):571-8. doi: 10.1016/s0363-5023(78)80008-2.
A study of the forces generated by the intrinsic muscles of the index finger and coordinating muscles of the hand found that the intrinsic muscles of the index finger contributed combined forces equivalent to approximately 80% of those generated by the flexor profundus and superficialis, and to 73% of the moment for the motion of metacarpopalangeal flexion with simultaneous interphalangeal joint extension. No current tendon transfer operation can correct this deficit, though several supply sufficient force at the metacarpophalangeal joint to counterbalance the extrinsic extensors.
一项关于食指固有肌和手部协同肌所产生力量的研究发现，食指固有肌所产生的合力约相当于指深屈肌和指浅屈肌所产生合力的80%，在掌指关节屈曲同时指间关节伸展的运动中，其力矩占73%。目前没有肌腱转移手术能够纠正这一缺陷，尽管有几种手术能在掌指关节提供足够的力量来对抗外在伸肌。
