Many possibilities: Could be some arthritis (though you are young), a meniscal tear, scar tissue, or a loose body. Some people just have crackling knees without anything serious wrong with the knee. It really depends on many things...Did you have surgery before, or a major injury? It sound like you should see a sports doctor to at least have an exam and xrays.
Answered 4/24/2015
5.3k views
Knee cap.: It could be some wear on the kneecap and you could have maltracking of the kneecap. See a non-surgical sportsmedicine specialist, who should be able to diagnose this and provide treatment.
Answered 6/23/2019
164 views
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A doctor has provided 1 answer
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