Double jointed means: that motion is above what is "normal" it is not really two joints but laxity. Some are born with use joints, others can get a loose joint after an injury. Randomly is unlikely, unrecognized and then noted some time after either born with or injured is more likely . Inflammatory changes can also weaken ligaments and sublux or even dislocated joints occur. Snapping is not "double jointed"
Answered 11/17/2014
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