Figure 1

Three-dimensional models of the human, great ape, and macaque tali. (A) Superior view of the extracted trochlea articular surfaces. (B) Superomedial view of the medial and lateral rims. The medial and lateral rims of the talar trochlea in the human, chimpanzee, orangutan, and Japanese macaque are uniformly convex, but the medial rim of the gorilla is flattened.