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The subject of traction in the treatment of hip disease has again been studied by Bradford and Lovett (New York Medical Journal, Aug. 4, 1894). Seven healthy hip joints in children between the age of 6 and 16 years were tested with a traction force of ten and twenty pounds; eighteen experiments were made. In three instances these resulted in one-eighth inch shortening; in five there was no change; and in the remaining ten there was lengthening, from one-eighth to one-fourth inch. From this it would appear that in the majority of instances traction of ten to twenty pounds will distract the healthy hip joint in children from one-eighth to one-fourth inch; but that in a certain number of cases this traction force appears to have no influence, and in a few instances it stimulates muscular contraction to an extent sufficient to actually shorten the limb one-eighth inch.
DISTRACTION IN THE TREATMENT OF HIP DISEASE.. JAMA. 1894;XXIII(9):357. doi:10.1001/jama.1894.02421140031005