Pain and swelling: The kneecap has a groove that it glides in naturally. If it dislocates, slips out of this groove, a pop is typically felt or heard. It is usually associated with pain and swelling. In some cases the kneecap will spontaneously go back into place but in others medical assistance is required to return it to the groove. Complications may include fracture, cartilage defect, persistent instability.
Answered 11/26/2012
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