Suggest Remedy To Flatten Locked Feet

hi docdor, my son can not walk because of muscle pain, his feet are locked that he can not flatten it. if he will stand it should be tip toed. and if you force him to flatten his feet, his body should be 30 degrees reclined. what should be do. can you give us home remedies to relieve him. we brought him to the doctor and he was just given advil.