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A coronal view of a DRR image used for measurement with the 3-D preoperative planning software is shown. The TSA is the line connecting p1/3 and d1/3. The TMA is the line connecting CE and CT. The TVA is the angle between TSA and TMA. The PVA is the angle between the TSA and the line connecting CE and p1/3. p1/3 = center of the proximal 1/3 of the tibia; d1/3 = center of the distal 1/3 of the tibia; CE = center of the tibial eminence; CT = center of the talar dome.
