Fig. 4

Illustration of the radiographic parameters measured on a long-leg standing X-ray with the knees pointing forward. Measures around the ankle. a mLDTA: angle between tibiaplafond and mechanical tibia axis. b mMA: angle between malleolar tips and mechanical tibia axis. c MHA: angle between malleolar tips and floor. d TPHA: angle between tibiaplafond and floor. e TTTA: angle between tibio-talar joint surfaces. mLDTA: Mechanical lateral distal tibia angle, mMA: Mechanical Malleolar Angle, MHA: Malleolar Horizontal Orientation Angle, TPHA: Tibia Plafond Horizontal Orientation Angle, TTTA: Tibio Talar Tilt Angle