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Fig. 7A —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 view of STAR device depicts method of angular evaluation.
Alpha angle (
) is formed by intersection of lines drawn parallel to
flat plate of tibial component and long axis of tibial shaft on
anteroposterior view (normal = 90°).
