The same thing happen to my Zada and when I took her to the orthopedic doctor to have her operated on again, he found that the Vet. didn't deepen the groove. I'll never let a regular Vet. do any specialized operation on any of my girls again.
As far as finding a very good specialist, my suggestion would be to call Dr. Bruecker at VSMG and ask him for a reference in your area. He could possibly know of one since he goes all over the country teaching his own technique. His number is 805-339-2290 and he own this hospital. Here is some information on him.
Doctors | Veterinary Medical And Surgical Group (VMSG)