Cases of cerebral spastic birth palsy not infrequently present the problem of the management of a flexion-internal rotation deformity of the thigh. In spite of prolonged training of muscles, it may be necessary to resort to operative procedures to improve muscle balance and relieve the deformity. In this paper I shall describe an operation used by me for the past ten years for the relief of this type of deformity. In this operation the muscles causing the deformity are transposed from their site of origin and attached to a new site on the ilium. In the new position they act as abductors, external rotators and extensors of the thigh.
MUSCLES INVOLVED IN SPASTIC DEFORMITY OF THE THIGH
The cerebral lesion of spastic birth palsy is usually sufficiently diffuse to impair the function of groups of muscles. A single deformity is not as common as is a compound one in which