Figure 10. Principal stress trajectories for the distal femoral condyles in the solution posture of ‘Troodon’, compared with observed cancellous bone fabric.
(A) Vector field of σ3 in the lateral condyle, shown as a 3-D slice parallel to the sagittal plane. (B) Observed vector field of u1 in the lateral condyle, shown in the same view as (A) (cf. Part I). (C) Vector field of σ3 in the medial condyle, shown as a 3-D slice parallel to the sagittal plane. (D) Observed vector field of u1 in the medial condyle, shown in the same view as (C) (cf. Part I). (E) Comparison of the mean direction of σ3 in the medial condyle (blue) and the mean direction of u1 (red), plotted on an equal-angle stereoplot with southern hemisphere projection. This shows that in the solution posture the mean direction of σ3 was of the same general azimuth as the mean direction of u1, but was markedly more posteriorly inclined. Inset shows location of region for which the mean direction of σ3 was calculated.