Knee locking in position

[Al]

Last night I woke up in the middle of the night to a pain in my knee, it was bent slightly and seemed to have locked into position whilst I was sleeping on my side. Trying to straighten it caused an unbearable pain like I was literally tearing my muscle.
Even moving the leg slightly was extremely painful to turn onto my back. It took 10 minutes of pain trying to extend my knee before it finally unlocked, it seemed to free up a bit at a time slowly allowing me to fully extend it. Now it feels fine apart from the calf feeling slightly tight.
It has happened a couple of times before but nowhere near as badly and always unlocked within 30 seconds or so, I'd always put it down to sleeping in a strange position or something.
Does this sound like cramp? I'm not totally sure what cramp is or what it would feel like?
I can't believe that with the amount of pain it was causing that it feels fine today.
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[jackw72]

I'm no expert but it sounds like you said the muscle may have been slightly contracted all night and just became very tight or something. I would assume this is the norm as I have had it a few times.

An unrelated incident was when I slept on my arm and had a dream about being bitten on the same arm then woke up it was completely numb I was like FECK. Then it all made sense.


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[Old Git Racing]

Have you had some knee trauma before, sounds like a damaged cartilage to me. (speaking from experience)

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[trevor saxe-coburg-gotha]

I get something similar - but it doesn't get 'stuck' as such. I've got movement, but there's a really intense and deep ache - sometimes in the area of my hip, other times knee. I wake up in the night with it and it totally fucking knackers. It went away when we had a new mattress - but t'mrs bought a groupon one and tbh it's absolutely shite. And so now I'm getting these mad, deep ache type things in my legs once or twice a week. At 44, for fucks sake.

Anyway, what I get is definitely not cramp - I have that from time to time, usually in calf muscles. Nowt like this. And I don't think what you're getting is cramp either.
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[Polarbear]

[Al]

[covent.gardens]

I woke up with that once and I put it down to sleeping with my leg at slightly the wrong angle. It was years ago but remember it well, almost completely jammed up and extreme pain just trying to straighten it, but like yours it was fine a few hours later. I wouldn't worry if it only happens very occasionally and after sleeping.

[bushido]

You have a tear in your medial meniscus

[trevor saxe-coburg-gotha]