Project 2136: J. Cubo, H. Woodward, E. Wolff, J. Horner. 2015. First reported cases of biomechanically adaptive bone modeling in non-avian dinosaurs. PLOS ONE. 10 (7):e0131131.
Specimen: † Maiasaura peeblesorum (MOR:005 T9)

Abstract

Predator confrontation or predator evasion frequently produces bone fractures in potential prey in the wild. Although there are reports of healed bone injuries and pathologies in non-avian dinosaurs, no previously published instances of biomechanically adaptive bone modeling exist. Two tibiae from an ontogenetic sample of fifty specimens of the herbivorous dinosaur Maiasaura peeblesorum (Ornithopoda: Hadrosaurinae) exhibit exostoses. We show that these outgrowths are cases of biomechanically adaptive periosteal bone modeling resulting from overstrain on the tibia after a fibula fracture. Histological and biomechanical results are congruent with predictions derived from this hypothesis. Histologically, the outgrowths are constituted by radial fibrolamellar periosteal bone tissue formed at very high growth rates, as expected in a process of rapid strain equilibration response. These outgrowths show greater compactness at the periphery, where tensile and compressive biomechanical constraints are higher. Moreover, these outgrowths increase the maximum bending strength in the direction of the stresses derived from locomotion. They are located on the antero-lateral side of the tibia, as expected in a presumably bipedal one year old individual, and in the posterior position of the tibia, as expected in a presumably quadrupedal individual at least four years of age. These results reinforce myological evidence suggesting that Maiasaura underwent an ontogenetic shift from the primitive ornithischian bipedal condition when young to a derived quadrupedal posture when older.


Read the article »

Article DOI: 10.1371/journal.pone.0131131

Project DOI: 10.7934/P2136, http://dx.doi.org/10.7934/P2136
This project contains
  • 4 Media
  • 1 Taxon
  • 3 Specimens
Total size of project's media files: 203.26M

Download Project SDD File
Currently Viewing:
MorphoBank Project 2136

    This research
    supported by

    Authors' Institutions

    • Montana State University

    • Purdue University

    • Sorbonne Universit√©

    • Museum of the Rockies



    Members

    member name taxa specimens media
    Holly Woodward
    Project Administrator
    Last logged in 07/08/15
    134


    Project has no matrices defined.



    Project views

    type number of views Individual items viewed (where applicable)
    Total project views12068
    Project overview2369
    Media views5290Media search (3452 views); M374497 (459 views); M374501 (438 views); M374503 (441 views); M374504 (500 views);
    Specimen list2255
    Taxon list1429
    Bibliography725




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project246
    Project downloads244
    Media downloads2M374497 (1 download); M374503 (1 download);