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Table 1 "True" rotational variance between femur (transepicondylar axis) and different tibial landmarks: medial border or medial third.

From: Rotational alignment of the tibial component in total knee arthroplasty is better at the medial third of tibial tuberosity than at the medial border

"true" rotational variance medial border medial third  
median 17.4° -1.6°  
range -13.8° to 32.9° -24.1° to 15.9° p < 0.001
≤ ± 5° 4% 68%  
≤ ± 10° 15% 85%  
≤ ± 20° 69% 98%  
  1. Negative values indicate femoral external rotation relative to the tibia, positive values indicate relative femoral internal rotation.