Why does my knee crack every time I bend it?

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Why does my knee crack every time I bend it? I was in the pool yesterday and noticed that my left knee cracked every time I bent it, in or out of the water. My right knee, however, cracks about one out of every five times I bend it.
I have hyper-extended both of my knees in years past, and I have patellar tendinitis in my right knee. Because I have injured both knees so much, I have been researching the muscles and functions in or around the area.
Just the other day, I stepped awkwardly and felt pain in my LCL for hours, even into the next day. When I was jumping off of the diving board just yesterday, I felt a sharp pain in my LCL, and the started to bend it to try and stretch it out, but then noticed my joint popping every time I bent it. This has continued into today, and no lie, it is every time I bend it.
By the way, i am 16 years old, so this is not because of old age. What do you think I should do?
  • Honestly, you should make a Dr. appointment and see what the Doctor has to say about it. It%26#039;s probably nothing to worry about (my ankle has been doing the same thing for the past 10 years or so) but then again, you never know...

    Go get it checked out! Especially since you%26#039;re into sports.
  • it may be that your double jointed in your knees, i am and the same thing happens to me
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