Knee injury: A contusion of the knee structures would be likely if you landed on your knee when you fell. Numbness is probably due to bruising of superficial nerves. Bone or patella bruises may take a couple of weeks to heal. Worrisome signs would be swelling, persistence or worsening of pain. See an orthopedic surgeon if you still have significant knee discomfort.
Answered 1/9/2018
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