I usually perform distalization of tibial tubercle as the first procedure to correct the patella alta. If need be, I add MPFL reconstruction as the second staged procedure. I never had to add trochlear plasty.
I do have considerable experience with trochleaplasty but feel that it is not indicated in grade 1dysplasia. I therefore agree with a combined TT Transfer with MPFL Reconstruction in this patient.
Static image exams are always important in patella instability, but I will never decide which surgery will be more appropriated without evaluating the patella tracking during active flexo-extension. In patients with subluxation in extension, Fulkerson alone is frequently not enough.