Anybody have any ideas

I have an appointment with the ortho, but I am having a problem with the leg muscle under my knee. It doesn't hurt much when I am walking, but having to go up and down stairs, and if I turn a certain way, it feels like the muscle is tearing away and I have to grab something or feel like I will fall down. I've had shin splints before, but nothing like this. Anyone have any ideas?

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