Thank you for your reply! I am so sorry to hear about your little one!
I do hope that it's just time that he needs to get back to the way he was. Did your vet say 11 weeks was normal? My 12 year old has arthritis and has taken some spills off the bed and down the stairs but apparently she is made out of Titanium because she hasn't had any problems like our little guy. This morning Mochi seemed to be able to walk a little slow on it, but when he wanted to pick up pace (which I quick grabbed him) or turned around I saw he lifted up the leg. But walking slow on it for a little bit is definitely better than how he was yesterday morning. I don't feel his knee out of place so that's why I think it's his hip joint and not patella. We'll see what happens over the weekend, fingers crossed he keeps healing.