Fig. 4
From: Reliability of measurements on lateral ankle radiographs
The schematic diagrams on which lateral radiographs of the ankle joint were not parallel. a, c, e, g: d-value is marked; b, d, f, h: d-value is not marked. a and b (d = 1 mm); c and d (d = 2 mm); e and f (d = 3 mm); g and h (d = 4 mm)