摘要：In 1921, one of the most complete pre-Late Pleistocene human tibiae was discovered at Broken Hill, Kabwe, Zam-
bia, apparently directly associated with the Broken Hill 1 cranium. Currently dated to the middle or earlier Middle
Pleistocene, the Broken Hill E691 tibia derives from a large Pleistocene individual. Its robusticity, both diaphyseal
and with respect to knee biomechanics, falls within Pleistocene human ranges of variation, its more precise posi-
tion depending upon which model of body shape is employed to estimate its original body mass. At the same time,
its relative proximal diaphyseal breadth and planoconvex subperiosteal diaphyseal contours align it principally
with other Pleistocene archaic Homo tibiae. It therefore joins the other, less clearly associated, Broken Hill postcra-
nial remains in helping to fll out the appendicular functional morphology of Middle Pleistocene humans.
