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In order that the treatment of subluxation of the knee-joint may be properly carried out its cause must be thoroughly understood.
Subluxation of this joint is an under-dislocation of the head of the tibia back of, or posterior to, the condyles of the femur. Such a deformity does not exist as a result of chronic disease when the femur is kept parallel with the tibia, during tubercular, synovial, traumatic, gonorrheal and other inflammatory diseases in and about the knee-joint. It can only result from direct violence and from faulty position during the course of treatment.
The series of experiments has been carried out to determine the relative power of the flexor and extensor muscles of the leg, as well as to determine at what angle, in flexion, the flexor muscles equal the extensors in power. We must remember that extension of the leg is limited to a parallelism with the
McCURDY SL. THE CAUSE AND MECHANICAL TREATMENT OF SUBLUXATION OF THE KNEE-JOINT.. JAMA. 1897;XXIX(3):99–101. doi:10.1001/jama.1897.02440290005001c