New Study Reveals Evolutionary Shift in Male Pelvic Structure Explains Gender Differences in Walking

A recent study from Tel Aviv University's Department of Anatomy and Anthropology reveals that the differences in walking between men and women stem from evolutionary changes in the male pelvis. Published in Scientific Reports, the research compared pelvises of Neanderthals with those of modern humans, finding that the male Neanderthal pelvis closely resembles that of modern women rather than modern men. This suggests that the male pelvis has undergone significant evolutionary changes, while the female pelvis has remained closer to the ancestral form due to childbirth requirements.

Led by Professor Yoel Rak and involving researchers from Spain, the Technion, Bar-Ilan University, and Ono Academic College, the study analyzed nearly complete male Neanderthal pelvises from Israel's Kebara Cave and Spain's Sima de los Huesos site. Despite Neanderthals' robust build, their pelvic structure was more similar to modern females. The key difference identified was the forward placement of the hip joints in modern males, which creates a biomechanical spring-like mechanism that conserves energy during walking by storing and releasing elastic energy.

The female pelvis, constrained by the need for a wider birth canal, did not undergo this shift and thus retained the ancestral pelvic form. Professor Ella Been from Ono Academic College, a co-author, noted that these findings have implications beyond evolutionary biology, potentially informing biomechanics, musculoskeletal medicine, rehabilitation, and injury prevention.

Professor Rak emphasized that the study challenges long-held views by suggesting that the male modern pelvis is the derived form, not the Neanderthal pelvis. This research highlights how even well-studied aspects of human anatomy can yield new insights that reshape our understanding of everyday functions like walking.