What a beautiful pup. He reminds me very much of our Nacho that our Director/Volunteer Angela is now his proud Mom. This is typically caused by a disrupted growth plate issue and if the pup is 11 weeks old it might be easier to address it ASAP. The surgery is ugly and expensive- essential they cut the blocking bone to allow the secondary partner bone room to grow accordingly. The hope is that the cut bone will fuse back normally.
First choice would certainly be a consult with a realistic orthopedic surgeon to check out options. I looks like he/she might be operable. We have used University of Iowa for this class of surgery in the past. I am sure there are other teaching hospitals across the country with orthopedic practices. We can certainly ask our lead vet for his thoughts if your member finds a surgeon/clinic.