Probably not serious: In 30 years of Orthopaedic practice I have never seen spontaneous air in a knee. If there is no pain, no click, no pop, no ligament looseness, no giving way, it is probably not serious. Gas gangrene is a serious infection causing gas under the skin, but I have never seen gas gangrene that was painless. Is there any history of injury? You could have fluid in the knee.
Answered 4/24/2016
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A doctor has provided 1 answer
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