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Liu WJP, Parr WCH, Walsh WR, Mobbs RJ. Three-dimensional morphometric analysis of cervical vertebral endplate anatomy: A systematic literature review. INTERDISCIPLINARY NEUROSURGERY 2022. [DOI: 10.1016/j.inat.2021.101388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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2
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Bai L, Peng YB, Liu SB, Xie XX, Zhang XM. Anatomical basis of a pedicled cuboid bone graft based on the lateral tarsal artery for talar avascular necrosis. Surg Radiol Anat 2021; 43:1703-1709. [PMID: 34232369 DOI: 10.1007/s00276-021-02789-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Accepted: 06/17/2021] [Indexed: 11/28/2022]
Abstract
PURPOSE Vascularized pedicled bone-grafting from the cuboid to the talus provides low donor site morbidity and satisfactory outcomes in patients with early-stage talar avascular necrosis. We investigated the anatomy of the rotational vascularized pedicled bone graft from the cuboid. METHODS 15 embalmed cadaver specimens were perfused with red latex via the popliteal artery. The lateral malleolus was dissected. The course of the lateral tarsal artery and the vascular territory in the cuboid supplied by the lateral tarsal artery were observed. Vessel diameters were measured. RESULTS The course of the lateral tarsal artery to the cuboid was consistent, and a vascularized pedicle of the lateral tarsal artery was present in all specimens. Mean diameter of the lateral tarsal artery was 1.40 ± 0.12 mm (range 1.67-1.25). Mean length of the vascularized pedicle was 67.15 ± 3.18 mm (range 62.43-74.36). The pedicle bone graft was long enough to reach the bony border of both the lateral and medial malleolus. CONCLUSION A vascularized pedicled cuboid bone graft based on the lateral tarsal artery has clinical utility for early-stage talar avascular necrosis.
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Affiliation(s)
- Lu Bai
- Department of Sports Medicine, Peking University Shenzhen Hospital, Shenzhen, Guangdong Province, China
| | - Yan-Bin Peng
- Department of Hand and Microsurgery, Peking University Shenzhen Hospital, Shenzhen, Guangdong Province, China
| | - San-Biao Liu
- Department of Sports Medicine, Peking University Shenzhen Hospital, Shenzhen, Guangdong Province, China
| | - Xiao-Xiao Xie
- Department of Sports Medicine, Peking University Shenzhen Hospital, Shenzhen, Guangdong Province, China
| | - Xue-Min Zhang
- Department of Vascular Surgery, Peking University People's Hospital, 11# Xizhimen South Street, Beijing, China.
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3
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Smaers JB, Rothman RS, Hudson DR, Balanoff AM, Beatty B, Dechmann DKN, de Vries D, Dunn JC, Fleagle JG, Gilbert CC, Goswami A, Iwaniuk AN, Jungers WL, Kerney M, Ksepka DT, Manger PR, Mongle CS, Rohlf FJ, Smith NA, Soligo C, Weisbecker V, Safi K. The evolution of mammalian brain size. SCIENCE ADVANCES 2021; 7:7/18/eabe2101. [PMID: 33910907 PMCID: PMC8081360 DOI: 10.1126/sciadv.abe2101] [Citation(s) in RCA: 65] [Impact Index Per Article: 21.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Accepted: 03/10/2021] [Indexed: 05/08/2023]
Abstract
Relative brain size has long been considered a reflection of cognitive capacities and has played a fundamental role in developing core theories in the life sciences. Yet, the notion that relative brain size validly represents selection on brain size relies on the untested assumptions that brain-body allometry is restrained to a stable scaling relationship across species and that any deviation from this slope is due to selection on brain size. Using the largest fossil and extant dataset yet assembled, we find that shifts in allometric slope underpin major transitions in mammalian evolution and are often primarily characterized by marked changes in body size. Our results reveal that the largest-brained mammals achieved large relative brain sizes by highly divergent paths. These findings prompt a reevaluation of the traditional paradigm of relative brain size and open new opportunities to improve our understanding of the genetic and developmental mechanisms that influence brain size.
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Affiliation(s)
- J B Smaers
- Department of Anthropology, Stony Brook University, Stony Brook, NY 11794, USA.
- Division of Anthropology, American Museum of Natural History, New York, NY 10024, USA
| | - R S Rothman
- Interdepartmental Doctoral Program in Anthropological Sciences, Stony Brook University, Stony Brook, NY 11794, USA
| | - D R Hudson
- Interdepartmental Doctoral Program in Anthropological Sciences, Stony Brook University, Stony Brook, NY 11794, USA
| | - A M Balanoff
- Department of Psychological and Brain Sciences Johns Hopkins University, Baltimore, MD 21218, USA
- Division of Paleontology, American Museum of Natural History, New York, NY 10024, USA
| | - B Beatty
- NYIT College of Osteopathic Medicine, Old Westbury, NY 11568, USA
- United States National Museum, Smithsonian Institution, Washington, DC 20560, USA
| | - D K N Dechmann
- Department of Migration, Max-Planck Institute of Animal Behavior, 78315 Radolfzell, Germany
- Department of Biology, University of Konstanz, 78464 Konstanz, Germany
| | - D de Vries
- Ecosystems and Environment Research Centre, School of Science, Engineering and Environment, University of Salford, Manchester M5 4WX, UK
| | - J C Dunn
- Division of Biological Anthropology, University of Cambridge, Cambridge CB2 3QG, UK
- Behavioral Ecology Research Group, Anglia Ruskin University, Cambridge CB1 1PT, UK
- Department of Cognitive Biology, University of Vienna, Vienna 1090, Austria
| | - J G Fleagle
- Department of Anatomical Sciences, Stony Brook University, Stony Brook, NY 11794, USA
| | - C C Gilbert
- NYIT College of Osteopathic Medicine, Old Westbury, NY 11568, USA
- Department of Anthropology, Hunter College, New York, NY 10065, USA
- PhD Program in Anthropology, Graduate Center of the City University of New York, 365 Fifth Avenue, New York, NY 10016, USA
- New York Consortium in Evolutionary Primatology, New York, NY 10065, USA
| | - A Goswami
- Department of Life Sciences, Natural History Museum, London SW7 5BD, UK
| | - A N Iwaniuk
- Department of Neuroscience, University of Lethbridge, Lethbridge, AB T1K-3M4, Canada
| | - W L Jungers
- Department of Anatomical Sciences, Stony Brook University, Stony Brook, NY 11794, USA
- Association Vahatra, BP 3972, Antananarivo 101, Madagascar
| | - M Kerney
- Behavioral Ecology Research Group, Anglia Ruskin University, Cambridge CB1 1PT, UK
| | - D T Ksepka
- Bruce Museum, Greenwich, CT 06830, USA
- Department of Ornithology, American Museum of Natural History, New York, NY 10024, USA
- Division of Science and Education, Field Museum of Natural History, Chicago, IL 60605, USA
- Department of Paleobiology, Smithsonian Institution, Washington, DC 20013, USA
| | - P R Manger
- School of Anatomical Sciences, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - C S Mongle
- Division of Anthropology, American Museum of Natural History, New York, NY 10024, USA
- Interdepartmental Doctoral Program in Anthropological Sciences, Stony Brook University, Stony Brook, NY 11794, USA
- Turkana Basin Institute, Stony Brook University, Stony Brook, NY 11794, USA
| | - F J Rohlf
- Department of Anthropology, Stony Brook University, Stony Brook, NY 11794, USA
| | - N A Smith
- Division of Science and Education, Field Museum of Natural History, Chicago, IL 60605, USA
- Campbell Geology Museum, Clemson University, Clemson, SC 29634, USA
| | - C Soligo
- Department of Anthropology, University College London, London WC1H 0BW, UK
| | - V Weisbecker
- College of Science and Engineering, Flinders University, Bedford Park, SA 5042, Australia
| | - K Safi
- Department of Migration, Max-Planck Institute of Animal Behavior, 78315 Radolfzell, Germany
- Department of Biology, University of Konstanz, 78464 Konstanz, Germany
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4
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Sorrentino R, Stephens NB, Carlson KJ, Figus C, Fiorenza L, Frost S, Harcourt-Smith W, Parr W, Saers J, Turley K, Wroe S, Belcastro MG, Ryan TM, Benazzi S. The influence of mobility strategy on the modern human talus. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 2019; 171:456-469. [PMID: 31825095 DOI: 10.1002/ajpa.23976] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Revised: 10/03/2019] [Accepted: 11/13/2019] [Indexed: 01/27/2023]
Abstract
OBJECTIVES The primate talus is known to have a shape that varies according to differences in locomotion and substrate use. While the modern human talus is morphologically specialized for bipedal walking, relatively little is known on how its morphology varies in relation to cultural and environmental differences across time. Here we compare tali of modern human populations with different subsistence economies and lifestyles to explore how cultural practices and environmental factors influence external talar shape. MATERIALS AND METHODS The sample consists of digital models of 142 tali from 11 archaeological and post-industrial modern human groups. Talar morphology was investigated through 3D (semi)landmark based geometric morphometric methods. RESULTS Our results show distinct differences between highly mobile hunter-gatherers and more sedentary groups belonging to a mixed post-agricultural/industrial background. Hunter-gatherers exhibit a more "flexible" talar shape, everted posture, and a more robust and medially oriented talar neck/head, which we interpret as reflecting long-distance walking strictly performed barefoot, or wearing minimalistic footwear, along uneven ground. The talus of the post-industrial population exhibits a "stable" profile, neutral posture, and a less robust and orthogonally oriented talar neck/head, which we interpret as a consequence of sedentary lifestyle and use of stiff footwear. DISCUSSION We suggest that talar morphological variation is related to the adoption of constraining footwear in post-industrial society, which reduces ankle range of motion. This contrasts with hunter-gatherers, where talar shape shows a more flexible profile, likely resulting from a lack of footwear while traversing uneven terrain. We conclude that modern human tali vary with differences in locomotor and cultural behavior.
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Affiliation(s)
- Rita Sorrentino
- Department of Biological, Geological and Environmental Sciences, University of Bologna, Bologna, Italy.,Department of Cultural Heritage, University of Bologna, Ravenna, Italy
| | - Nicholas B Stephens
- Department of Anthropology, Pennsylvania State University, State College, Pennsylvania
| | - Kristian J Carlson
- Department of Integrative Anatomical Sciences, Keck School of Medicine, University of Southern California, Los Angeles, California.,Evolutionary Studies Institute, University of the Witwatersrand, Palaeosciences Centre, Johannesburg, South Africa
| | - Carla Figus
- Department of Cultural Heritage, University of Bologna, Ravenna, Italy
| | - Luca Fiorenza
- Department of Anatomy and Developmental Biology, Monash University, Clayton, Victoria, Australia.,Earth Sciences, University of New England, Armidale, New South Wales, Australia
| | - Stephen Frost
- Department of Anthropology, University of Oregon, Eugene, Oregon
| | - William Harcourt-Smith
- Graduate Center, City University of New York, New York, New York.,New York Consortium in Evolutionary Primatology, New York, New York.,Department of Anthropology, Lehman College, New York, New York.,Division of Paleontology, American Museum of Natural History, New York, New York
| | - William Parr
- Surgical and Orthopaedic Research Laboratory, Prince of Wales Hospital, University of New South Wales, Sydney, New South Wales, Australia
| | - Jaap Saers
- PAVE Research Group, Department of Archaeology & Anthropology, University of Cambridge, Cambridge, UK
| | - Kevin Turley
- Department of Anthropology, University of Oregon, Eugene, Oregon
| | - Stephen Wroe
- Function, Evolution and Anatomy Research Laboratory, Zoology Division, School of Environmental and Rural Science, University of New England, New South Wales, Australia
| | - Maria G Belcastro
- Department of Biological, Geological and Environmental Sciences, University of Bologna, Bologna, Italy.,ADES, UMR 7268 CNRS/Aix-Marseille Université/EFS, Aix-Marseille Université, Marseille Cedex 15, France
| | - Timothy M Ryan
- Department of Anthropology, Pennsylvania State University, State College, Pennsylvania
| | - Stefano Benazzi
- Department of Cultural Heritage, University of Bologna, Ravenna, Italy.,Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
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5
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TSUBAMOTO TAKEHISA. Relationship between the calcaneal size and body mass in primates and land mammals. ANTHROPOL SCI 2019. [DOI: 10.1537/ase.190221] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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6
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Inter-ray variation in metatarsal strength properties in humans and African apes: Implications for inferring bipedal biomechanics in the Olduvai Hominid 8 foot. J Hum Evol 2018; 121:147-165. [DOI: 10.1016/j.jhevol.2018.02.013] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Revised: 02/22/2018] [Accepted: 02/23/2018] [Indexed: 11/20/2022]
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7
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Parr WCH, Wilson LAB, Wroe S, Colman NJ, Crowther MS, Letnic M. Cranial Shape and the Modularity of Hybridization in Dingoes and Dogs; Hybridization Does Not Spell the End for Native Morphology. Evol Biol 2016. [DOI: 10.1007/s11692-016-9371-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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8
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Yapuncich GS, Gladman JT, Boyer DM. Predicting euarchontan body mass: A comparison of tarsal and dental variables. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 2015; 157:472-506. [DOI: 10.1002/ajpa.22735] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2014] [Revised: 01/14/2015] [Accepted: 02/21/2015] [Indexed: 11/07/2022]
Affiliation(s)
| | - Justin T. Gladman
- The Graduate Center; City University of New York; New York NY 10016
- New York Consortium in Evolutionary Primatology (NYCEP); New York NY 10028
| | - Doug M. Boyer
- Department of Evolutionary Anthropology; Duke University; Durham NC 27708
- New York Consortium in Evolutionary Primatology (NYCEP); New York NY 10028
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9
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Knigge RP, Tocheri MW, Orr CM, Mcnulty KP. Three-Dimensional Geometric Morphometric Analysis of Talar Morphology in Extant Gorilla Taxa from Highland and Lowland Habitats. Anat Rec (Hoboken) 2014; 298:277-90. [DOI: 10.1002/ar.23069] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2014] [Accepted: 10/11/2014] [Indexed: 11/11/2022]
Affiliation(s)
- Ryan P. Knigge
- Evolutionary Anthropology Lab, Department of Anthropology; University of Minnesota; Minneapolis Minnesota
| | - Matthew W. Tocheri
- Human Origins Program, Department of Anthropology; National Museum of Natural History, Smithsonian Institution; Washington DC
- Center for the Advanced Study of Hominid Paleobiology, Department of Anthropology; The George Washington University; Washington DC
| | - Caley M. Orr
- Department of Anatomy; Midwestern University; Downers Grove Illinois
| | - Kieran P. Mcnulty
- Evolutionary Anthropology Lab, Department of Anthropology; University of Minnesota; Minneapolis Minnesota
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10
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Parr WCH, Soligo C, Smaers J, Chatterjee HJ, Ruto A, Cornish L, Wroe S. Three-dimensional shape variation of talar surface morphology in hominoid primates. J Anat 2014; 225:42-59. [PMID: 24842795 DOI: 10.1111/joa.12195] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/31/2014] [Indexed: 11/28/2022] Open
Abstract
The hominoid foot is of particular interest to biological anthropologists, as changes in its anatomy through time reflect the adoption of terrestrial locomotion, particularly in species of Australopithecus and Homo. Understanding the osteological morphology associated with changes in whole foot function and the development of the plantar medial longitudinal foot arch are key to understanding the transition through habitual bipedalism in australopithecines to obligate bipedalism and long-distance running in Homo. The talus is ideal for studying relationships between morphology and function in this context, as it is a major contributor to the adduction-abduction, plantar-dorsal flexion and inversion-eversion of the foot, and transmits all forces encountered from the foot to the leg. The talar surface is predominantly covered by articular facets, which have different quantifiable morphological characters, including surface area, surface curvature and orientation. The talus also presents challenges to the investigator, as its globular shape is very difficult to quantify accurately and reproducibly. Here we apply a three-dimensional approach using type 3 landmarks (slid semilandmarks) that are geometrically homologous to determine overall talar shape variations in a range of living and fossil hominoid taxa. Additionally, we use novel approaches to quantify the relative orientations and curvatures of talar articular facets by determining the principal vectors of facet orientation and fitting spheres to articular facets. The resulting metrics are analysed using phylogenetic regressions and principal components analyses. Our results suggest that articular surface curvatures reflect locomotor specialisations with, in particular, orangutans having more highly curved facets in all but the calcaneal facet. Similarly, our approach to quantifying articular facet orientation appears to be effective in discriminating between extant hominoid species, and may therefore provide a sound basis for the study of fossil taxa and evolution of bipedalism in Australopithecus and Homo.
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Affiliation(s)
- W C H Parr
- Surgical and Orthopaedic Research Laboratory, Prince of Wales Hospital, Randwick, Sydney, NSW, Australia
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11
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Islam K, Dobbe A, Komeili A, Duke K, El-Rich M, Dhillon S, Adeeb S, Jomha NM. Symmetry analysis of talus bone: A Geometric morphometric approach. Bone Joint Res 2014; 3:139-45. [PMID: 24802391 PMCID: PMC4037882 DOI: 10.1302/2046-3758.35.2000264] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
OBJECTIVE The main object of this study was to use a geometric morphometric approach to quantify the left-right symmetry of talus bones. METHODS Analysis was carried out using CT scan images of 11 pairs of intact tali. Two important geometric parameters, volume and surface area, were quantified for left and right talus bones. The geometric shape variations between the right and left talus bones were also measured using deviation analysis. Furthermore, location of asymmetry in the geometric shapes were identified. RESULTS Numerical results showed that talus bones are bilaterally symmetrical in nature, and the difference between the surface area of the left and right talus bones was less than 7.5%. Similarly, the difference in the volume of both bones was less than 7.5%. Results of the three-dimensional (3D) deviation analyses demonstrated the mean deviation between left and right talus bones were in the range of -0.74 mm to 0.62 mm. It was observed that in eight of 11 subjects, the deviation in symmetry occurred in regions that are clinically less important during talus surgery. CONCLUSIONS We conclude that left and right talus bones of intact human ankle joints show a strong degree of symmetry. The results of this study may have significance with respect to talus surgery, and in investigating traumatic talus injury where the geometric shape of the contralateral talus can be used as control. Cite this article: Bone Joint Res 2014;3:139-45.
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Affiliation(s)
- K Islam
- University of Alberta, Departmentof Mechanical Engineering, Edmonton, Alberta, Canada
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12
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Yapuncich GS, Boyer DM. Interspecific scaling patterns of talar articular surfaces within primates and their closest living relatives. J Anat 2013; 224:150-72. [PMID: 24219027 DOI: 10.1111/joa.12137] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/12/2013] [Indexed: 01/30/2023] Open
Abstract
The articular facets of interosseous joints must transmit forces while maintaining relatively low stresses. To prevent overloading, joints that transmit higher forces should therefore have larger facet areas. The relative contributions of body mass and muscle-induced forces to joint stress are unclear, but generate opposing hypotheses. If mass-induced forces dominate, facet area should scale with positive allometry to body mass. Alternatively, muscle-induced forces should cause facets to scale isometrically with body mass. Within primates, both scaling patterns have been reported for articular surfaces of the femoral and humeral heads, but more distal elements are less well studied. Additionally, examination of complex articular surfaces has largely been limited to linear measurements, so that 'true area' remains poorly assessed. To re-assess these scaling relationships, we examine the relationship between body size and articular surface areas of the talus. Area measurements were taken from microCT scan-generated surfaces of all talar facets from a comprehensive sample of extant euarchontan taxa (primates, treeshrews, and colugos). Log-transformed data were regressed on literature-derived log-body mass using reduced major axis and phylogenetic least squares regressions. We examine the scaling patterns of muscle mass and physiological cross-sectional area (PCSA) to body mass, as these relationships may complicate each model. Finally, we examine the scaling pattern of hindlimb muscle PCSA to talar articular surface area, a direct test of the effect of mass-induced forces on joint surfaces. Among most groups, there is an overall trend toward positive allometry for articular surfaces. The ectal (= posterior calcaneal) facet scales with positive allometry among all groups except 'sundatherians', strepsirrhines, galagids, and lorisids. The medial tibial facet scales isometrically among all groups except lemuroids. Scaling coefficients are not correlated with sample size, clade inclusivity or behavioral diversity of the sample. Muscle mass scales with slight positive allometry to body mass, and PCSA scales at isometry to body mass. PCSA generally scales with negative allometry to articular surface area, which indicates joint surfaces increase faster than muscles' ability to generate force. We suggest a synthetic model to explain the complex patterns observed for talar articular surface area scaling: whether 'muscles or mass' drive articular facet scaling is probably dependent on the body size range of the sample and the biological role of the facet. The relationship between 'muscle vs. mass' dominance is likely bone- and facet-specific, meaning that some facets should respond primarily to stresses induced by larger body mass, whereas others primarily reflect muscle forces.
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Affiliation(s)
- Gabriel S Yapuncich
- Department of Evolutionary Anthropology, Duke University, Durham, NC, USA; New York Consortium in Evolutionary Anthropology (NYCEP), New York, NY, USA
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Turley K, Frost SR. The Shape and Presentation of the Catarrhine Talus: A Geometric Morphometric Analysis. Anat Rec (Hoboken) 2013; 296:877-90. [DOI: 10.1002/ar.22696] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2012] [Accepted: 02/27/2013] [Indexed: 11/11/2022]
Affiliation(s)
- Kevin Turley
- Department of Anthropology; University of Oregon; Eugene Oregon
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14
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Finite element micro-modelling of a human ankle bone reveals the importance of the trabecular network to mechanical performance: new methods for the generation and comparison of 3D models. J Biomech 2012; 46:200-5. [PMID: 23218138 DOI: 10.1016/j.jbiomech.2012.11.011] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2012] [Revised: 07/27/2012] [Accepted: 11/04/2012] [Indexed: 11/23/2022]
Abstract
Most modelling of whole bones does not incorporate trabecular geometry and treats bone as a solid non-porous structure. Some studies have modelled trabecular networks in isolation. One study has modelled the performance of whole human bones incorporating trabeculae, although this required considerable computer resources and purpose-written code. The difference between mechanical behaviour in models that incorporate trabecular geometry and non-porous models has not been explored. The ability to easily model trabecular networks may shed light on the mechanical consequences of bone loss in osteoporosis and remodelling after implant insertion. Here we present a Finite Element Analysis (FEA) of a human ankle bone that includes trabecular network geometry. We compare results from this model with results from non-porous models and introduce protocols achievable on desktop computers using widely available softwares. Our findings show that models including trabecular geometry are considerably stiffer than non-porous whole bone models wherein the non-cortical component has the same mass as the trabecular network, suggesting inclusion of trabecular geometry is desirable. We further present new methods for the construction and analysis of 3D models permitting: (1) construction of multi-property, non-porous models wherein cortical layer thickness can be manipulated; (2) maintenance of the same triangle network for the outer cortical bone surface in both 3D reconstruction and non-porous models allowing exact replication of load and restraint cases; and (3) creation of an internal landmark point grid allowing direct comparison between 3D FE Models (FEMs).
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15
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Smaers JB, Dechmann DKN, Goswami A, Soligo C, Safi K. Comparative analyses of evolutionary rates reveal different pathways to encephalization in bats, carnivorans, and primates. Proc Natl Acad Sci U S A 2012; 109:18006-11. [PMID: 23071335 PMCID: PMC3497830 DOI: 10.1073/pnas.1212181109] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Variation in relative brain size is commonly interpreted as the result of selection on neuronal capacity. However, this approach ignores that relative brain size is also linked to another highly adaptive variable: body size. Considering that one-way tradeoff mechanisms are unlikely to provide satisfactory evolutionary explanations, we introduce an analytical framework that describes and quantifies all possible evolutionary scenarios between two traits. To investigate the effects of body mass changes on the interpretation of relative brain size evolution, we analyze three mammalian orders that are expected to be subject to different selective pressures on body size due to differences in locomotor adaptation: bats (powered flight), primates (primarily arboreal), and carnivorans (primarily terrestrial). We quantify rates of brain and body mass changes along individual branches of phylogenetic trees using an adaptive peak model of evolution. We find that the magnitude and variance of the level of integration of brain and body mass rates, and the subsequent relative influence of either brain or body size evolution on the brain-body relationship, differ significantly between orders and subgroups within orders. Importantly, we find that variation in brain-body relationships was driven primarily by variability in body mass. Our approach allows a more detailed interpretation of correlated trait evolution and variation in the underlying evolutionary pathways. Results demonstrate that a principal focus on interpreting relative brain size evolution as selection on neuronal capacity confounds the effects of body mass changes, thereby hiding important aspects that may contribute to explaining animal diversity.
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Affiliation(s)
- Jeroen B. Smaers
- Department of Anthropology, University College London, London WC1H 0BW, United Kingdom
- Department of Genetics, Evolution, and Environment, University College London, London WC1E 6BT, United Kingdom
| | - Dina K. N. Dechmann
- Department of Biology, University of Konstanz, 78464 Konstanz, Germany
- Department of Migration and Immunoecology, Max Planck Institute for Ornithology, 78315 Radolfzell, Germany; and
| | - Anjali Goswami
- Department of Genetics, Evolution, and Environment, University College London, London WC1E 6BT, United Kingdom
- Department of Earth Sciences, University College London, London WC1E 6BT, United Kingdom
| | - Christophe Soligo
- Department of Anthropology, University College London, London WC1H 0BW, United Kingdom
| | - Kamran Safi
- Department of Biology, University of Konstanz, 78464 Konstanz, Germany
- Department of Migration and Immunoecology, Max Planck Institute for Ornithology, 78315 Radolfzell, Germany; and
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Toward integration of geometric morphometrics and computational biomechanics: New methods for 3D virtual reconstruction and quantitative analysis of Finite Element Models. J Theor Biol 2012; 301:1-14. [DOI: 10.1016/j.jtbi.2012.01.030] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2011] [Revised: 01/11/2012] [Accepted: 01/16/2012] [Indexed: 11/17/2022]
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Parr WCH, Chatterjee HJ, Soligo C. Calculating the axes of rotation for the subtalar and talocrural joints using 3D bone reconstructions. J Biomech 2012; 45:1103-7. [PMID: 22284429 DOI: 10.1016/j.jbiomech.2012.01.011] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2011] [Revised: 01/09/2012] [Accepted: 01/10/2012] [Indexed: 11/25/2022]
Abstract
Orientation of the subtalar joint axis dictates inversion and eversion movements of the foot and has been the focus of evolutionary and clinical studies for a number of years. Previous studies have measured the subtalar joint axis against the axis of the whole foot, the talocrural joint axis and, recently, the principal axes of the talus. The present study introduces a new method for estimating average joint axes from 3D reconstructions of bones and applies the method to the talus to calculate the subtalar and talocrural joint axes. The study also assesses the validity of the principal axes as a reference coordinate system against which to measure the subtalar joint axis. In order to define the angle of the subtalar joint axis relative to that of another axis in the talus, we suggest measuring the subtalar joint axis against the talocrural joint axis. We present corresponding 3D vector angles calculated from a modern human skeletal sample. This method is applicable to virtual 3D models acquired through surface-scanning of disarticulated 'dry' osteological samples, as well as to 3D models created from CT or MRI scans.
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Affiliation(s)
- W C H Parr
- School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, NSW 2052, Australia.
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