{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T10:52:50Z","timestamp":1790765570215,"version":"4.1.0"},"reference-count":61,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2020,1,5]],"date-time":"2020-01-05T00:00:00Z","timestamp":1578182400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/501100000038","name":"Natural Sciences and Engineering Research Council of Canada","doi-asserted-by":"publisher","award":["23458"],"award-info":[{"award-number":["23458"]}],"id":[{"id":"10.13039\/501100000038","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Journal of Anatomy"],"published-print":{"date-parts":[[2020,4]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The development of the iliosacral joint (ISJ) in tetrapods represented a crucial step in the evolution of terrestrial locomotion. This structure is responsible for transferring forces between the vertebral column and appendicular skeleton, thus supporting the bodyweight on land. However, most research dealing with the water\u2010to\u2010land transition and biomechanical studies in general has focused exclusively on the articulation between the pelvic girdle and femur. Our knowledge about the contact between the pelvic girdle and vertebral column (i.e. the ISJ) at a tissue level is restricted so far to human anatomy, with little to no information available on other tetrapods. This lack of data limits our understanding of the development and evolution of such a key structure, and thus on the pattern and processes of the evolution of terrestrial locomotion. Therefore, we investigated the macro\u2010 and microanatomy of the ISJ in limb\u2010bearing squamates that, similar to most non\u2010mammalian, non\u2010avian tetrapods, possess only two sacral ribs articulating with the posterior process of the ilium. Using a combination of osteology, micro\u2010computed tomography and histology, we collected data on the ISJ apparatus of numerous specimens, sampling different taxa and different ontogenetic stages. Osteologically, we recorded consistent variability in all three processes of the ilium (preacetabular, supracetabular and posterior) and sacral ribs that correlate with posture and locomotion. The presence of a cavity between the ilium and sacral ribs, abundant articular cartilage and fibrocartilage, and a surrounding membrane of dense fibrous connective tissue allowed us to define this contact as a synovial joint. By comparison, the two sacral ribs are connected to each other mostly by dense fibrous tissue, with some cartilage found more distally along the margins of the two ribs, defining this joint as a combination of a syndesmosis and synchondrosis. Considering the intermediary position of the ISJ between the axial and appendicular skeletons, the shape of the articular surfaces of the sacral ribs and ilium, and the characteristics of the muscles associated with this structure, we argue that the mobility of the ISJ is primarily driven by the movements of the hindlimb during locomotion. We hypothesize that limited torsion of the ilium at the ISJ happens when the hip is abducted, and the joint is likely able to absorb the compressional and extensional forces related to the protraction and retraction of the femur. The mix of fibres and cartilage between the two sacral ribs instead serves primarily as a shock absorber, with the potential for limited vertical translation during locomotion.<\/jats:p>","DOI":"10.1111\/joa.13132","type":"journal-article","created":{"date-parts":[[2020,1,6]],"date-time":"2020-01-06T02:31:58Z","timestamp":1578277918000},"page":"668-687","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["The iliosacral joint in lizards: an osteological and histological analysis"],"prefix":"10.1111","volume":"236","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4645-5962","authenticated-orcid":false,"given":"Ilaria","family":"Paparella","sequence":"first","affiliation":[{"name":"Department of Biological Sciences University of Alberta Edmonton AB Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2497-1296","authenticated-orcid":false,"given":"Aaron R. H.","family":"LeBlanc","sequence":"additional","affiliation":[{"name":"Department of Biological Sciences University of Alberta Edmonton AB Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael R.","family":"Doschak","sequence":"additional","affiliation":[{"name":"Faculty of Pharmacy &amp; Pharmaceutical Sciences and Department of Biomedical Engineering University of Alberta Edmonton AB Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael W.","family":"Caldwell","sequence":"additional","affiliation":[{"name":"Department of Biological Sciences University of Alberta Edmonton AB Canada"},{"name":"Department of Earth and Atmospheric Sciences University of Alberta Edmonton AB Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2020,1,5]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"crossref","first-page":"151","DOI":"10.1007\/BF03049956","article-title":"Studies on the anatomy of the tail in Sauria and Rhynchocephalia. 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