Posterior tendon transfer to the dorsum of the foot through the
interosseous membrans is an effective procedure for spastic equinovarus
deformity. The complications of excessive calcaneal or excessive valgus
deformity can be avoided if the transfer is not inserted too tightly with
the foot in dorsiflexion and if it is not transferred to a cuboid
insertion. Electromyographic activity was demonstrated in some of the
transferred muscles during the swing phase of gait. Tendo achillis
lengthening in association with posterior tibial transfer must be done
judiciously to avoid deformity of the calcaneus.