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In the Dinosaur Park Formation (DPF) of Alberta, Canada, they are known predominantly from isolated material, precluding taxonomic and ontogenetic precision for this clade. Previously never sampled histologically within the DPF, here we attempt to fill in gaps in our knowledge about the life histories of the clade in this formation by histologically surveying metatarsals, which are among the most abundant and identifiable troodontid elements in the DPF. We sampled 11 metatarsals (three metatarsal IIs, three metatarsal IIIs and five metatarsal IVs) of varying sizes and included three pathological individuals to describe the microanatomy of both healthy and pathological metatarsals, determine the ontogenetic status of each element and graph their pattern of growth. Osteohistology reveals that troodontid metatarsals grew and remodelled asymmetrically within the cortex, ceasing growth and remodelling primarily along articular surfaces and entheses. Pathological individuals ranged from displaying features of response to localised stress (chronic callus formation and avulsion\/chip fracture) to extreme modification in response to trauma and inflammation at the distal joint. Only the latter appeared to be related to overall growth, suggesting the condition either developed early and stunted growth or another underlying cause was responsible for both the stunted growth and the resulting pathological features observed. Overall, tracking the growth of the specimens reveals that there are at least two growth trajectories within the DPF differentiated by the timing of major growth spurts and growth plateaus. Whether this represents sexual dimorphism, taxonomic diversity, or another form of variation warrants further investigation.<\/jats:p>","DOI":"10.1111\/joa.14262","type":"journal-article","created":{"date-parts":[[2025,4,19]],"date-time":"2025-04-19T06:49:11Z","timestamp":1745045351000},"page":"736-764","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Osteohistological analysis of metatarsals reveals new information on pathology and life history of troodontids from the Campanian Dinosaur Park Formation, Alberta, Canada"],"prefix":"10.1111","volume":"247","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8049-6269","authenticated-orcid":false,"given":"Christiana W.","family":"Garros","sequence":"first","affiliation":[{"name":"Department of Biological Sciences University of Alberta  Edmonton Alberta Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mark J.","family":"Powers","sequence":"additional","affiliation":[{"name":"Department of Biological Sciences University of Alberta  Edmonton Alberta Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aaron D.","family":"Dyer","sequence":"additional","affiliation":[{"name":"Department of Ecology and Evolutionary Biology University of Toronto  Toronto Ontario Canada"},{"name":"Department of Natural History Royal Ontario Museum  Toronto Ontario Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Philip J.","family":"Currie","sequence":"additional","affiliation":[{"name":"Department of Biological Sciences University of Alberta  Edmonton Alberta Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,4,19]]},"reference":[{"key":"e_1_2_11_2_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-981-99-2575-9_1"},{"key":"e_1_2_11_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/evl3.156"},{"key":"e_1_2_11_4_1","first-page":"273","volume-title":"Biology of the Reptilia","author":"Andrews R.M.","year":"1982"},{"key":"e_1_2_11_5_1","doi-asserted-by":"publisher","DOI":"10.1098\/rsos.160222"},{"key":"e_1_2_11_6_1","doi-asserted-by":"publisher","DOI":"10.1139\/E10-030"},{"key":"e_1_2_11_7_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1469-7580.2006.00540.x"},{"key":"e_1_2_11_8_1","doi-asserted-by":"publisher","DOI":"10.1111\/joa.14053"},{"key":"e_1_2_11_9_1","doi-asserted-by":"publisher","DOI":"10.1111\/iwj.12231"},{"key":"e_1_2_11_10_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1469\u20107580.2011.01450.x"},{"key":"e_1_2_11_11_1","doi-asserted-by":"publisher","DOI":"10.1017\/pab.2021.35"},{"key":"e_1_2_11_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.palaeo.2012.06.027"},{"key":"e_1_2_11_13_1","doi-asserted-by":"publisher","DOI":"10.1111\/2041-210X.12226"},{"key":"e_1_2_11_14_1","doi-asserted-by":"publisher","DOI":"10.1002\/jmor.10018"},{"key":"e_1_2_11_15_1","doi-asserted-by":"publisher","DOI":"10.1017\/S0952836904004844"},{"issue":"4","key":"e_1_2_11_16_1","first-page":"301","article-title":"Expression of growth dynamic in the structure of periosteal bone in Anas platyrhynchos","volume":"319","author":"Castanet J.","year":"1996","journal-title":"Comptes Rendus de l'Academie des Sciences. 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