Does it hurt on the side of the knee or in the middle?
I've had three knee operations and all were because of
meniscus tears. Felt like bones grinding like you describe,
and there was lots of popping. Never had the kneecap
lock though.
Doctor will most likely get you an MRI. If it's the meniscus,
don't worry. You'll only be off your feet for a day or two after the scope.
Best of luck
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