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Fig. 7C —Radiographic measurements for total ankle arthroplasty
(illustrated using STAR [Scandinavian Total Ankle Replacement, Waldemar Link]
device). Angular and linear values can be defined to evaluate changes in
component alignment and position that may signify component migration
[8–10].
Anteroposterior (C) and lateral (D) views of STAR device depict
method of linear evaluation of component position. Linear values are
established by measuring position of components relative to surrounding
osseous structures. Measurement "a" is perpendicular distance
between tip of lateral malleolus and line drawn through base of tibial
component. Measurement "b" is perpendicular distance from anterior
aspect of talar component to line intersecting calcaneal tubercle and dorsal
aspect of talonavicular joint. Measurement "c" is perpendicular
distance from posterior aspect of talar component to line intersecting
calcaneal tubercle and dorsal aspect of talonavicular joint.
