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Look first thing first. Let the surgery procedure get done. when he discharged from the hospital immediately starts his physiotherapy
as soon as possible. as much you delay Physiotherapy the chances of recovery gets diminished. Recovery will be slow. be faithful to physiotherapy. May take year or more. Recovery chances are as good as 70-80%. It means he can be almost as accurate as before but all is the matter of time and quality of treatment given. Be faithful to god. There is always a hope.you can also contact me if you want further information.