Figure 3. Class I fracture diagnostic of blunt force injury of the olecranon process and trochlear notch of the proximal right ulna of Au. sediba (MH2 top row) – two views: lateral (left) and posterior (right).

While breccia is present in the Class I fracture, the modes of bone failure (tension and compression) are visible. Compare with bottom row, three views of left proximal ulna with fracture of olecranon process (anterior, lateral posterior views), which is associated with a fall from a height.