Fig. 1From: The influence of posterior tibial slope on the mid-term clinical effect of medial-pivot knee prosthesisSchematic diagram of a posterior tibial slope. a The tibia anterior cortex extension line. b Perpendicular to the extension line of the anterior tibial cortex. c The connection between the front and rear edges of the tibial plateau. The red arrow displays the angle between the two lines b and c; this is the posterior tibial slope (PTS)Back to article page