Dug this out as all of a sudden poor Hendrix started limping again this morning and wouldn't weight bear on his back leg. He went back to bed and I assume his knee must have righted itself as he went back out and then started zooming around as if nothing had happened.
It's been such a long time since we've had any recurrence, I honestly thought this wouldn't be a problem anymore and it was the late closure of his growth plates.
Unfortunately the vet won't give me anti-inflammatories for him without taking him in again as it's well over six months since he was last seen for this issue. As he was charging around again when I left for work, I'm going to see how he goes and if it starts up again, straight to the vet. They are open tomorrow morning and I'm sure even if he's walking ok when I take him in, they'll prescribe him some anti-inflammatories. He has been a bit grumpy the last couple of days and if he's been in pain and masking it, this could explain his moodiness! I know I'm moody when my knees hurt