Fig. 4A–B.

The images show the potential measurement variabilty for the posterosuperior wall fracture with an oblique orientation shown in Fig. 1. Depending on the selected position for measurement, (A) the three different measurements shown (B) when compared with the uninjured contralateral hip indicate 17%, 25%, or 34% posterior wall involvement, which would correspond to a stable or an indeterminate prediction. The hip was unstable by EUA.