Changes

The Kellgren-Lawrence scale has been recommended:,<ref>{{cite journal|url=http://www.bjjprocs.boneandjoint.org.uk/content/94-B/SUPP_XXXVII/64|title=How to assess ankle osteoarthritis: comparison of the Kellgren and Lawrence scale with functional outcome and digital image analysis|author=Nicolas Holzer, Davide Salvo, Anne Karien Marijnissen, Aminudin Che Ahmad, Emanuele Sera, Pierre Hoffmeyer, Anne Lübbeke Wolff, Mathieu Assal|journal=Orthopaedic Proceedings|date=2017-09-14|volume=94-B}}</ref>but in practice it is generally acceptable to give the degree as mild/moderate or severe. 

Varus or valgus deformity , if suspected, 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.<ref name=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>