CPT® Code 27394

The procedure described by CPT® Code 27394 involves the lengthening of multiple hamstring tendons in one leg. 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 key muscles: the biceps femoris, semitendinosus, and semimembranosus, which play crucial roles in extending the knee and flexing the thigh. The lengthening of these tendons aims to correct the muscle imbalance, thereby improving the patient's gait and overall mobility. The procedure is more extensive than the lengthening of a single tendon, as indicated by CPT® Code 27393, which addresses the lengthening of one hamstring tendon. The surgical approach involves making an incision in the popliteal crease, exposing the tendon, and performing a Z-shaped incision to facilitate the lengthening process. This technique allows the tendon fibers to slide apart as the knee is extended, ultimately leading to a more functional range of motion. Following the procedure, the tendon is secured in its lengthened position with sutures, and a long leg or cylinder cast is applied to maintain the knee in an extended position during the recovery phase.