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[2015]<jats:italic>BMC Evolutionary Biology<\/jats:italic>15, 68). Using 2D data, we found that the bodies and pedicles of lower vertebrae of pathological humans were more similar in shape to those of chimpanzees than were those of healthy humans. Based on this, we hypothesized that some individuals are more prone to intervertebral disc herniation because their vertebrae exhibit ancestral traits and therefore are less well adapted for the stresses associated with bipedalism. Here, we report a study in which we tested this \u201cAncestral Shape Hypothesis\u201d with 3D data from the last two thoracic and first lumbar vertebrae of pathological<jats:italic>Homo sapiens<\/jats:italic>, healthy<jats:italic>H. sapiens<\/jats:italic>,<jats:italic>Pan troglodytes<\/jats:italic>, and several extinct hominins.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>We found that the pathological and healthy<jats:italic>H. sapiens<\/jats:italic>vertebrae differed significantly in shape, and that the pathological<jats:italic>H. sapiens<\/jats:italic>vertebrae were closer in shape to the<jats:italic>P. troglodytes<\/jats:italic>vertebrae than were the healthy<jats:italic>H. sapiens<\/jats:italic>vertebrae. Additionally, we found that the pathological human vertebrae were generally more similar in shape to the vertebrae of the extinct hominins than were the healthy<jats:italic>H. sapiens<\/jats:italic>vertebrae. These results are consistent with the predictions of the Ancestral Shape Hypothesis. Several vertebral traits were associated with disc herniation, including a vertebral body that is both more circular and more ventrally wedged, relatively short pedicles and laminae, relatively long, more cranio-laterally projecting transverse processes<jats:italic>,<\/jats:italic>and relatively long, cranially-oriented spinous processes. We found that there are biomechanical and comparative anatomical reasons for suspecting that all of these traits are capable of predisposing individuals to intervertebral disc herniation.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>The results of the present study add weight to the hypothesis that intervertebral disc herniation in<jats:italic>H. sapiens<\/jats:italic>is connected with vertebral shape. Specifically, they suggest that individuals whose vertebrae are towards the ancestral end of the range of shape variation within<jats:italic>H. sapiens<\/jats:italic>\u00a0have a greater propensity to develop the condition than other individuals. More generally, the study shows that evolutionary thinking has the potential to shed new light on human skeletal pathologies.<\/jats:p><\/jats:sec>","DOI":"10.1186\/s12862-019-1550-9","type":"journal-article","created":{"date-parts":[[2019,12,16]],"date-time":"2019-12-16T17:03:17Z","timestamp":1576515797000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["3D shape analyses of extant primate and fossil hominin vertebrae support the ancestral shape hypothesis for intervertebral disc herniation"],"prefix":"10.1186","volume":"19","author":[{"given":"Kimberly A.","family":"Plomp","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Keith","family":"Dobney","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Darlene A.","family":"Weston","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Una","family":"Strand Vi\u00f0arsd\u00f3ttir","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mark","family":"Collard","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2019,12,16]]},"reference":[{"key":"1550_CR1","doi-asserted-by":"publisher","first-page":"205","DOI":"10.1097\/00002517-200006000-00003","volume":"13","author":"BF Walker","year":"2000","unstructured":"Walker BF. 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