Etymology: Thomas Bryant, English physician, 1828-1914; L, trahere, to pull
an orthopedic mechanism used to immobilize both lower extremities in the treatment of a fractured femur or in the correction of a congenital hip dislocation. The mechanism consists of a traction frame supporting weights, which are connected by ropes that run through pulleys to traction foot plates. The traction pull elevates the lower extremities to a vertical position with the patient supine, the trunk and the lower extremities forming a right angle. The weight applied to the traction mechanism is usually less than 35 pounds. Compare Buck's traction.