Random Question about Knee Joint

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stickgirl390

I tell chemistry jokes periodically.
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What could cause the knee joint to “lock” (non-permanently) in a 90 degree flexed position, that IS NOT a meniscus tear?

thanks!

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A loose body. Either a torn meniscus fragment or a loose body, consisting of a piece of cartilage with a bone fragment to name a few. Get an MRI and see a doctor.
 
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Loose fragments from OA, RA, trauma, inflammation, etc.
 
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What could cause the knee joint to “lock” (non-permanently) in a 90 degree flexed position, that IS NOT a meniscus tear?

thanks!

Did you measure the angle? Reminds me of Conan's Stachenblochen sketch
 
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