Changes

[[File:X-ray of frontal tibiotalar surface angle (TTS).jpg|right|100px]]Varus or valgus deformity can be measured with the frontal tibiotalar surface angle (TTS):, formed by the mid-longitudinal tibial axis (such as through a line bisecting the tibia at 8 and 13 cm above the tibial plafond) and the talar surface.<refname=Nosewicz2012>{{cite journal|last1=Nosewicz|first1=Tomasz L.|last2=Knupp|first2=Markus|last3=Bolliger|first3=Lilianna|last4=Hintermann|first4=Beat|title=The reliability and validity of radiographic measurements for determining the three-dimensional position of the talus in varus and valgus osteoarthritic ankles|journal=Skeletal Radiology|volume=41|issue=12|year=2012|pages=1567–1573|issn=0364-2348|doi=10.1007/s00256-012-1421-6}}</ref>[[File:X-ray of frontal tibiotalar surface angle (TTS).jpg|thumb|center]]