Hi, dealing with foot and wrist drops is challenging, especially in an old case like yours. Calf lengthening surgery is helpful for TA (Tendo Achilles) tightness. In TA tightness, the foot goes into plantar flexion, which looks like a foot drop. The actual cause of food drop is weakness or paralysis of the tibialis anterior muscles, the muscles on the front of the lower leg. (read my article on foot drop here)
However, both may exist. I do not know whether you have TA tightness or not. Calf lengthening surgery can help bring the ankle joint into a neutral position. However, to bring the movement of the (Dorsiflexion) of the foot, the strength and power of the tibialis anterior muscle is necessary.
You can send your reports here with us for our opinion, but considering all this, your surgeon is the best professional to decide on it.