Possible: Joints have a capsule arounding then that hold slippery clear goo that acts like oil on a hinge. If the capsule is too weak or the weight on the joint is too heavy, or you used the joint too much, it could bulge into a cyst. However to blame it on a specific activity years ago is hard.
Answered 5/1/2017
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2 doctors weighed in across 2 answers
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