Abstract
Our next patient is a girl fourteen years old, who had an attack of polio-myelitis when she was an infant, which left several groups of muscles in the right limb paralyzed. When she steps upon the right foot the knee bends inward to a marked degree, the bottom of the foot turns outward, and the femur rotates inward, so that the head of the femur is subluxated outward and backward. The most noticeable deformity is at the knee. As she lies here under chloroform the limb seems quite straight, but you see there is great lateral motion at the knee, and when I rotate the knee inward, and press upon the bottom of the foot, the head of the femur slips partly out of the socket, allowing a peculiar jerking motion. Now if I hold the knee so that it cannot rotate or bend inward, you see I can make
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