I did not do anything to injure mine either. Just happens sometimes. I am 67 so that may have something to do with it.
59, so maybe, plus the type of work I've done.
Sounds like your kneeling past is catching up. Ibuprofen, ice packs, some rest and some gentle stretching. Is there any swelling? You may need to do a little strengthening there after your knee calms down.
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