Possible damage: It is possible that you simply sprained the knee ligaments or surrounding muscles and the knee will heal soon. If there was no swelling or discoloration it probably indicates no major damage. Sometimes a small cartilage tear can cause fluid to collect within the joint making full bending of the joint difficult until the fluid dissipates. See an orthopedic surgeon if the symptom persists.
Answered 11/28/2017
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