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In the transactions of the American Orthopedic Association, vol. v., a new theory for the causation of the deformities of hip disease is advanced by Dr. A. M. Phelps, of New York. Heretofore it has been held that the deformities of flexion, abduction and adduction were caused either by the limit assuming the position of greatest comfort, or that flexion and adduction at the commencement of the disease were due to the joint capsule being distended with fluid, and later when the capsule ruptured, the limb passed into adduction and greater flexion because the adductors and flexors were stronger than the abductors and extensors. Neither theory has been satisfactory.
From abundant clinical data Dr. Phelps found:
1. That abduction always preceded flexion, or was attended by it, in the first stage; 2. That abduction and outward rotation are always present in the second stage, and flexion nearly always present, but
ETIOLOGY OF THE VARIOUS DEFORMITIES OF HIP-JOINT DISEASE. JAMA. 1893;XX(14):398. doi:10.1001/jama.1893.02420410022004
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