Editing Diprotodon (section)

====Long bones====
Unlike those of most marsupials, the humerus of ''Diprotodon'' is almost straight rather than S-shaped, and the [[trochlea of humerus|trochlea of the humerus]] at the elbow joint is not perforated. The ridges for muscle attachments are poorly developed, which seems to have been compensated for by the powerful forearms. Similarly, the condyles where the [[radius (bone)|radius]] and [[ulna]] (the forearm bones) connect maintain their rounded shape and are quite-similarly sized, and unusually reminiscent of the condyles between the [[femur]] and the [[tibia]] and [[fibula]] in the leg of a kangaroo.{{sfn|Owen|1870|loc=pp. 551–554}}

{{Multiple image
|image1 = Diprotodon femur interior.jpg
|image2 = Diprotodon femur exterior.jpg
|footer = Different views of a ''Diprotodon'' femur
}}
Like elephants, the femur of ''Diprotodon'' is straight and compressed anteroposteriorly (from headside to tailside). The walls of the femur are prodigiously thickened, strongly constricting the [[medullary cavity]] where the [[bone marrow]] is located. The proximal end (part closest to the hip joint) is notably long, broad, and deep. The [[femoral head]] projects up far from the [[greater trochanter]]. As in kangaroos, the greater trochanter is split into two lobes. The [[femoral neck]] is roughly the same diameter as the femoral head. Also as in kangaroos, the condyle for the fibula is excavated out but the condyle for the tibia is well-rounded and hemispherical. Like those of many other marsupials, the tibia is twisted and the tibial [[malleolus]] (on the ankle) is reduced.{{sfn|Owen|1870|loc=pp. 560–566}}