How fast can soft tissue stretch?

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I am asking because I have permanently tight knees bent at 90 degree angles. Bevause of this I cannot walk.  I cannot straighten them out as the soft tissue has become shortened over time. Meaning the soft tissue adapted to this over time.

I want to know how fast soft tissue can be stretched and how much. If I can stretch it out I can finally walk again

Please tell me all you know on the matter. I really really appreciate it guys

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Sorry I don't have the answer. How did this happen? Did you do LL?

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Due to inactivity I sat a lot and my legs became permenently bent at the knee. I have muscular dystrophy as I couldn't exercise much so I spent much time sitting. Sitting too much caused the soft tissue to adapt and now I can't stretch my legs out and walk.

So as you can see I really would like to know information about soft tissue stretching because theoretically I can walk again as I have muscle strength but I just can't stay in my legs

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I don't speak for everyone, but you might not find a definitive answer on this forum. It's a bit out of our realm of collective knowledge.

What have your doctors told you? Have you worked with a physiologist before? While your condition is uncommon to us, it shouldn't be for them.

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Well the reason why I ask is because I learn that you guys have to stretch the soft tissue also after all leg lengthening which is basically what I would have to do also. I just wanted to know how much soft tissue can stretch and how fast

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There is no certain answer to that.
It is very weird that you had so tight soft tissues only from not walking much.
If you don't have health problem I believe that with 1-2 months of PT and with stretching exercises you'll do on your own you'll be ok.

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So from reading your post you have muscular dystrophy and did not do LL. I hope you can find a solution to the knee bending. You definitely want to talk to your doctor/physiologist/pt about it.

Sorry that we can't be more useful this is definitely above the scope of the forum