You can't grow this kind of thing on your own thoug, you would need a microfracture.
kscope - as Lottie said, my defect (which did show up on initial MRI and X-Ray and can be seen on the latest MRI as filled) did fill without mfx or drilling - some people (like me evidently) can build fibro without intervention and others cannot - and it's not a small pinhole either, 1.5cm2 (not huge of course). That I had fibro wasn't known until I had the scope (but that was 5 months post injury) - the OS went in with a view to possibly need to drill but didn't as the hole was filled well enough. It has settled to some degree but still have pain and swelling. Not enough to go down the MACI route according to the OS I saw for second opinion. I was actually going to have AMIC yesterday but the insurance company wouldn't cover. Actually, rather glad I didn't as the knee is more bearable now than when initially decided! OS decided there would be no point in debriding and microfracturing as I could just end up in the same situation with tenderness (I guess this could be an option of the fibro disintegrates). What I don't truly get is the need to be NWB completely post MFX, I hobble around on my defect and it filled My OS is also pretty anti-OATS in my situationI don't know what the future holds for the defect which is in a WB area laterally and connects with the ground when I kneel (hence I can't comfortably) - my OS is unable to give any sort of timescale for how long the fibro will last, but I try to avoid annoying it and am trying to keep leg muscles strong