Fig. 6. Intra-operative measurement of anterior offset of the tibia from the femur. (A) Intra-operative images of a left knee with varus deformity in 90° of flexion demonstrate the measurement of anterior offset of the tibia from the worn distal medial articular surface of the femur. (B) In order to restore the slope of the native proximal tibial joint line, the anterior-posterior slope and thickness of the tibial component are adjusted until the anterior tibia offset from the distal medial femoral condyle matches that of the knee at the time of exposure.
