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A member asked:

My left knee has been giving out when i have been jumping in the trampoline the past day or so and cracking a bit. is this normal for a teenager?

2 doctor answers2 doctors weighed in
Dr. Luis Eguiguren
Pediatrics 42 years experience
Not normal: "Cracking" could be normal but your knee giving out is not. Most worrisome would be that you could have injured your neck, if you forced your head position during a jump or fall.
Dr. Deborah Ungerleider
Pediatrics 37 years experience
Cracking without: pain can be normal, but giving out while jumping or cracking with pain is not. You should see your primary care doctor and/or an orthopedist to get examined to make sure there is not a structural reason for this, such as a tear in one of the knee ligaments.
Dr. Luis Eguiguren
Pediatrics 42 years experience
There would probably aldo be some pain and swelling in the knee If there was a torn ligament.
Aug 12, 2015
Last updated Aug 12, 2015

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