babies front legs folded inwards

My rabbit isn't neutered, His leg was stuck in a chair's leg that I sat on about 1-2 hours ago, after that he was holding his left front leg up for a while. but now he's looking fine like come and humping on my feet, running after me, jumping on a sofa but I feel like his leg's not fine now...

Hi I have a baby rabbit unsure of age we had the mom dad and baby off someone for free. They wasnt really looked after. They had clumps of poo stuck to there bum size of gold balls. And the babies front legs wont straighten. He walks on the joints. Does anyone know what this could be please. I'm...