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Journal of Bone and Joint Surgery, 1974;56:1592-1597.
© 1974 by The Journal of Bone and Joint Surgery, Inc

The Relative Strength of the Hamstrings during Hip Extension

ROBERT L. WATERS M.D.1, JACQUELIN PERRY M.D.1, JACK M. McDANIELS M.D.1, and KENNETH HOUSE SC.B.1

1 From the Kinesiology Laboratory, Rancho Los Amigos Hospital-University of Southern California Medical Center, Downey

The role of the hamstrings in extension of the hip was determined in eight normal subjects by measuring maximum isometric hip extension torque in different positions of hip flexion before and after sciatic-nerve block. Total hip extensor strength increased more than twofold as the hip was flexed from zero to 90 degrees. Following sciatic-nerve block, hip extension strength was reduced approximately 50 per cent in all positions of hip flexion. The hamstrings accounted for approximately one-third of total measured extensor torque.


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