My dad has this weird leg spasm when he walks to much.He has bad knees too.He has no more cushoning in his knees. But the weirdest thing is he gets this spasm in his calf.It makes him stop where he has to sit for a couple of minutes till it passes.what could the problem be.Its gotten worst the past five days. He can barely stand up when he sits down.what can i do to ease...

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