Doctor can check: An orthopedic doctor or a sports medicine doctor can check to see why a knee would "give out" ("give out" has different meanings to different people, so one must describe the symptoms to the doctor in detail, and know what positions or motions make the knee worse or better). Sometimes there's some ligament or cartilage damage; other times it's just a sports "overuse" problem.
Answered 6/16/2020
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