Glad you found the site! Okay so here's the story...These things can happen...Chloe my little girl is also 10 months old and not 3 weeks ago had surgery on her left knee for the same thing...her's was hereditary but that's neither here nor there! It's important to know these things happen with these little guys and the surgery although invasive will allow them to move properly on that knee...when my vet who concidently grew up with my dad (bonus

) went in to fix her knee he discovered she didn't even have a knee cap to screw together...so he had to make her one as well as connect the cartlidge...poor thing didn't know what hit her...she felt bad for the first 2 weeks but after that it was like it never happened...so no worries he'll be good as new before ya know it! If you have any questions at all feel free to ask..there are a lot of people who have had this problem as well and everyone here is very generous and sweet! Best of Luck to you!!