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Detailed explanation of the radiographic measurements. P1 the most anterior point on the tibial plateau, P2 the most anterior and distally available point of the tibia, p1 midpoint at proximal portion of the patella, p2 midpoint at distal portion of the patella, a patella length, b distance from apex of the patella to the contact point, patella axis line connecting points p1 and p2, X patella flexion angle (PF), Y tibiopatellar angle (TP), b/a estimated patellofemoral contact point (PC)
