For about 6 or 7 years, I've had this problem with my right leg, in which I can't straighten it out all the way, it randomly decides to swell up, and it's just extremely painful.
Had MRI scans and whatnot. They thought I tore the cartilage in my knee, but that wasn't the case.
Anyway, in 2017 I had physiotherapy, which seemed to help, as I had no major issues throughout 2018, maybe the odd twinge, but it was a good year.
Go back a few months ago (this year), and my knee decided to randomly start swelling again, but even more so than usual.
Been told I have a torn MCL. Having physio again, but it doesn't seem to be making things better. The swelling used to just be around the inner knee, but now it's spread all around it.
I'm extremely hyperactive most days, and can't sit still for long periods, which means I'm not resting my knee enough.
Also, I'd like to know how I tore my MCL, because despite the fact I'm hyperactive, I'm like the least athletic person you'll ever meet. I mean I exercise in my room occasionally, but I don't go on long runs or anything like that.
Probably tore it running for a bus or something
TL;DR
Tore my MCL (no idea how) and it's been very painful recently.