CPT® Code 27393

The procedure described by CPT® Code 27393 involves the lengthening of a single hamstring tendon. 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 consists of three muscles: the biceps femoris, semitendinosus, and semimembranosus, which play crucial roles in extending the knee and flexing the thigh. In this specific procedure, the surgeon makes an incision in the popliteal crease, which is the area behind the knee, to access the tendon insertion site on the tibia. The surgical technique involves creating a Z-shaped incision in the tendon, which facilitates lengthening by allowing the tendon fibers to separate as the knee is extended. After the tendon is lengthened, sutures are placed to secure it in the new, elongated position. To ensure proper healing and alignment, a long leg or cylinder cast is applied with the knee in an extended position. This procedure is distinct from other related codes, such as CPT® 27394, which is used for lengthening multiple hamstring tendons in one leg, and CPT® 27395, which is for lengthening multiple tendons in both legs.