Boyd amputation. A, Fish-mouth incision; shaded areas represent resected bone. B, Cartilage of distal tibia is removed by shaving gradually until bony epiphysis is reached; calcaneus is shifted anteriorly, and Achilles tendon is sectioned to prevent it from migrating proximally. C, Fixation with smooth medullary pin aids fusion of calcaneus to distal tibial epiphysis. SEE TECHNIQUE 29.34.