CPT® Code 27400

The procedure described by CPT® Code 27400 involves the transfer of the hamstring tendons or muscles to the femur, specifically utilizing an Egger's type procedure. This surgical intervention is primarily indicated for patients suffering from conditions such as spastic cerebral palsy, meningomyelocele, or other neurological disorders that lead to muscle imbalances, particularly resulting in a flexed-knee gait. The hamstring group is composed of three distinct muscles: the biceps femoris, semitendinosus, and semimembranosus. These muscles play a crucial role in extending the knee and flexing the thigh. During the procedure, a horizontal incision is made at the popliteal crease to expose the insertion points of the hamstring tendons on the proximal tibia. Following this exposure, the hamstring tendons are carefully divided and subsequently transferred to the proximal aspect of the femoral condyles, where they are anchored securely in place. This transfer aims to restore proper muscle function and improve gait mechanics in affected individuals.