Fig. 1From: Supramalleolar osteotomy with medial distraction arthroplasty for ankle osteoarthritis with talar tiltAnterior-posterior view of the ankle (a). Tibial articular surface (TAS) angle, the angle between line a and b; talar tilt (TT) angle, the angle between line b and c; talocrural (TC) angle, the angle between line a and d; and tibial medial malleolar (TMM) angle, the angle between line a and e. Lateral view of the ankle (b). The tibial lateral surface (TLS) angle, the angle between tibial axis line a and articular tangent line f. Saltzman view of the ankle and the hindfoot alignment (HFA) angle, the line between a and g (c)Back to article page