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Includes Expert Content
Knee popping out of socket, loose joint?
asator posted:
About five weeks ago, I was doing some live brazillian jiujitsu rolling. To keep it simple, I was in a position where I was on my back, with my knees bent and the base of my shins in my partner's inner thighs, with him on his knees (Butterfly guard, google image search it for an example).

My partner sat his weight down hard on me, and my left knee popped out of socket. This happens occasionally with my right knee, but straightening it out fixes it and I can keep going. Prior to this my left knee had never popped out, but now the joint feels loose. I have not been rolling hard at all, just resting it. It has been feeling better, Ive been taking glucosamine condroitin, but today I was getting off the mat and it popped out again.

I'm sort of afraid that something might be torn, given that its nowhere near back to 100% after five weeks. For what its worth, the clinic doctor downstairs from our gym said its probably a sprained LCL.

Is it possible to tear a ligament with this sort of pressure? Simply bending the knee too far in the right direction?
David Berkoff, MD responded:
you need a better diagnosis here. Did you "pop out" you knee joint or your patella ( more likely) is your knee functionally unstable, to you need further imaging? All questions that need to be addressed. If it is your patella this is dislocation you may need to take care of it as repeated dislocations can damage the articular cartilage. As for your last question, yes this sort of pressure could damage ligaments but you really need a proper evaluation of this knee.
Good luck.
asator replied to David Berkoff, MD's response:
Well, had the ortho doc look at it. Got an MRI done. Looks like a grade 2 sprain of the LCL and grade 1 sprains of the ACL and Patellar tendon.
Blake Boggess, DO replied to asator's response:
Although this injury hurts, you are lucky that it is not worse. The majority of the time this can be treated non-operatively with rest, physical therapy

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