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      Anatomic study of fibrous structures attached to the volar ulnar corner of the radius: implications in the volar rim fracture

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          Abstract

          This study aimed to clarify the bone and soft tissue morphological features at the volar ulnar corner of the radius. Micro-computed tomography, macroscopic and histological analyses were conducted using 12 cadaveric wrists, and in vivo MRI studies of the wrist were evaluated in five healthy volunteers. The volar ulnar corner of the distal radius has a protrusion volar to the sigmoid notch. The capsule elements of the radiolunate and radioulnar joints merge and this conjoined capsule attaches to the radius at the ulnar protrusion. Histologically, this capsule attaches to the radius via fibrocartilage, with fibres running in the radioulnar direction. In-vivo MRI studies showed that the capsule attaching to the volar ulnar corner could be traced to the dorsal side of the ulnar styloid. Our findings indicate that, given the direction of the fibres, an avulsion force in the radioulnar direction could be a cause for volar rim fractures.

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          Epidemiology of adult fractures: A review.

          Charles Court-Brown, Ben Caesar (2006)
          The epidemiology of adult fractures is changing quickly. An analysis of 5953 fractures reviewed in a single orthopaedic trauma unit in 2000 showed that there are eight different fracture distribution curves into which all fractures can be placed. Only two fracture curves involve predominantly young patients; the other six show an increased incidence of fractures in older patients. It is popularly assumed that osteoporotic fractures are mainly seen in the thoracolumbar spine, proximal femur, proximal humerus and distal radius, but analysis of the data indicates that 14 different fractures should now be considered to be potentially osteoporotic. About 30% of fractures in men, 66% of fractures in women and 70% of inpatient fractures are potentially osteoporotic.
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            Where tendons and ligaments meet bone: attachment sites ('entheses') in relation to exercise and/or mechanical load.

            G Bydder, John Benjamin, J A Ralphs … (2006)
            Entheses (insertion sites, osteotendinous junctions, osteoligamentous junctions) are sites of stress concentration at the region where tendons and ligaments attach to bone. Consequently, they are commonly subject to overuse injuries (enthesopathies) that are well documented in a number of sports. In this review, we focus on the structure-function correlations of entheses on both the hard and the soft tissue sides of the junction. Particular attention is paid to mechanical factors that influence form and function and thus to exploring the relationship between entheses and exercise. The molecular parameters indicative of adaptation to mechanical stress are evaluated, and the basis on which entheses are classified is explained. The application of the 'enthesis organ' concept (a collection of tissues adjacent to the enthesis itself, which jointly serve the common function of stress dissipation) to understanding enthesopathies is considered and novel roles of adipose tissue at entheses are reviewed. A distinction is made between different locations of fat at entheses, and possible functions include space-filling and proprioception. The basic anchorage role of entheses is considered in detail and comparisons are explored between entheses and other biological 'anchorage' sites. The ability of entheses for self-repair is emphasized and a range of enthesopathies common in sport are reviewed (e.g. tennis elbow, golfer's elbow, jumper's knee, plantar fasciitis and Achilles insertional tendinopathies). Attention is drawn to the degenerative, rather than inflammatory, nature of most enthesopathies in sport. The biomechanical factors contributing to the development of enthesopathies are reviewed and the importance of considering the muscle-tendon-bone unit as a whole is recognized. Bony spur formation is assessed in relation to other changes at entheses which parallel those in osteoarthritic synovial joints.
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              A review of trabecular bone functional adaptation: what have we learned from trabecular analyses in extant hominoids and what can we apply to fossils?

              Susannah Thorpe, Tracy L. Kivell (2016)
              Many of the unresolved debates in palaeoanthropology regarding evolution of particular locomotor or manipulative behaviours are founded in differing opinions about the functional significance of the preserved external fossil morphology. However, the plasticity of internal bone morphology, and particularly trabecular bone, allowing it to respond to mechanical loading during life means that it can reveal greater insight into how a bone or joint was used during an individual's lifetime. Analyses of trabecular bone have been commonplace for several decades in a human clinical context. In contrast, the study of trabecular bone as a method for reconstructing joint position, joint loading and ultimately behaviour in extant and fossil non-human primates is comparatively new. Since the initial 2D studies in the late 1970s and 3D analyses in the 1990 s, the utility of trabecular bone to reconstruct behaviour in primates has grown to incorporate experimental studies, expanded taxonomic samples and skeletal elements, and improved methodologies. However, this work, in conjunction with research on humans and non-primate mammals, has also revealed the substantial complexity inherent in making functional inferences from variation in trabecular architecture. This review addresses the current understanding of trabecular bone functional adaptation, how it has been applied to hominoids, as well as other primates and, ultimately, how this can be used to better interpret fossil hominoid and hominin morphology. Because the fossil record constrains us to interpreting function largely from bony morphology alone, and typically from isolated bones, analyses of trabecular structure, ideally in conjunction with that of cortical structure and external morphology, can offer the best resource for reconstructing behaviour in the past.
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                Author and article information

                Journal
                Title: Journal of Hand Surgery (European Volume)
                Abbreviated Title: J Hand Surg Eur Vol
                Publisher: SAGE Publications
                ISSN (Print): 1753-1934
                ISSN (Electronic): 2043-6289
                Publication date Created: July 2021
                Publication date (Electronic): January 17 2021
                Publication date (Print): July 2021
                Volume: 46
                Issue: 6
                Pages: 637-646
                Affiliations
                [1 ]Department of Clinical Anatomy, Tokyo Medical and Dental University, Tokyo, Japan
                [2 ]Department of Orthopaedics, Teikyo University School of Medicine, Tokyo, Japan
                [3 ]Department of Functional Joint Anatomy, Tokyo Medical and Dental University, Tokyo, Japan
                [4 ]Department of Radiology, St. Luke's International Hospital, Tokyo, Japan
                Article
                DOI: 10.1177/1753193420982192
                SO-VID: 5cbb1281-4bdd-4751-997f-27de83c4098d
                Copyright © © 2021
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                http://journals.sagepub.com/page/policies/text-and-data-mining-license

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