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abnormalities of the femoral head ( 6 , 7 , 8 , 9 , 10 , 11 , 12 ). These structural variables highlight the importance of using CT imaging to thoroughly evaluate the 3D bony anatomy of the femur and pelvis, and routine utilization of CT has been endorsed
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after Perthes disease, avascular necrosis of the femoral head, together with the development of new surgical approaches and procedures, have revolutionized the field of hip-preserving surgery. Pre-operative workup Conventional radiographs remain
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Traditionally, the Hill-Sachs defect (HSD) is a posterolateral compression fracture in the humeral head that happens when the glenoid edge hits the humeral head during an anterior dislocation. 5 - 7 The size of the HSD increases with subsequent dislocation
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Division of Orthopaedics and Trauma Surgery, Department of Surgery, Geneva University Hospitals, Geneva, Switzerland
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theoretically improve the rotational range of motion. The ratio between humeral head size and height is relatively constant. 15 The highest point of the humeral head lies 8 ± 3.2 mm above the greater tuberosity ( Fig. 3 ). 14 Lastly, relative to the humeral
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advantages over conventional polyethylene articulations were low wear rates, increased range of motion (with increasing head size), and improved stability and reduced dislocation rates, 13 although these merits have been debated. An estimated 35% of all
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understand how these injuries occur. Mechanisms of injury For the purposes of this article, a motorcycle is defined as having an engine size greater than 150 cc. Through the review of the existing literature, we have identified distinct injury
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size in determining outcome in osteonecrosis of the femoral head . Tech Orthop 2001 ; 16 : 6 - 15 9 Lang P , Jergesen HE , Moseley ME , et al. . Avascular necrosis of the femoral head: high-field-strength MR
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successful HRA are: (1) careful patient selection; (2) surgical skill and experience; and (3) optimal implant design, with restricting the use of large size femoral heads and accurate implant positioning ( 36 ). In this section, we discuss the literature
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-energy injury mechanisms. A possible reason for the relatively increased involvement of the lateral tibial plateau ( Fig. 3 ) may be its decreased bone mineral density in comparison to the medial plateau. 7 Fig. 3 Most partial tibial head fractures
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Faculty of Medicine, University of Geneva, Geneva, Switzerland
Division of Orthopaedics and Trauma Surgery, Department of Surgery, Geneva University Hospitals, Geneva, Switzerland
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mobile joint in the human body, allowing the hand to reach a wide range of positions. This mobility can be further enhanced by translation of the humeral head on the glenoid, but the consequence of this tremendous mobility is perhaps a predisposition to
