Hi,my Son(14) Has SMA-LED. He Is Having Achilles Tendon Lengthening Surgery For Toe Walking. Anyone Go Thru This Surgery? Was It Successful?

So Say I Do Have This Condition, The Referral From My Neurosurgeons To This Speciality Hospital Said Paraspinal Atrophy, SMA

Muscles Are Not Weak But Cannot Stand More Than 30 Seconds Before Feeling Weak, Fatigued, No Stamina And Needing To Sit. Is This SMA?