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相关概念视频

Flat Belts: Problem Solving01:28

Flat Belts: Problem Solving

Flat belts are crucial in many industrial applications as they help transmit power from one pulley to another. The concept of forces and moments is used to determine the maximum moment on a pulley. For instance, consider a flat belt that wraps around two pulleys, A and B, with radii of 30 cm and 10 cm, respectively. The angle between the belt and the horizontal is 20 degrees at the pulleys. As pulley B rotates clockwise and drives pulley A, tension T2 is caused at one end of the belt, while...

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皮带跟踪:一个老问题与新的见解.

Robert E Watts1, Tetyana Gorbachova1, Russell C Fritz1

  • 1From the Departments of Radiology (R.E.W., A.M.L., R.D.B.) and Orthopaedic Surgery (S.L.S.), Stanford University School of Medicine, 300 Pasteur Dr, Stanford, CA 94305-5101; Department of Radiology, Einstein Healthcare Network and Jefferson Health, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA (T.G.); Department of Musculoskeletal Radiology, National Orthopedic Imaging Associates, Greenbrae, CA (R.C.F.); Department of Musculoskeletal Radiology, Atlantic Medical Imaging, Galloway, NJ (S.S.S.); Department of Radiology, Benning Martin Army Community Hospital, Fort Benning, GA (J.K.); Departments of Radiology and Biomedical Data Science, Stanford University, Stanford, CA (A.S.C.); and Department of Orthopaedic Surgery, Lucile Packard Children's Hospital at Stanford, Palo Alto, CA (K.G.S.).

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概括

本综述涵盖了骨关节不稳定的成像,重点关注解剖学,临床评估和骨关节炎前的诊断成像. 关键方面包括中间骨骨关节带 (MPFL) 和骨关节异常.

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科学领域:

  • 放射学 放射学是一门学科.
  • 整形外科手术 整形外科手术
  • 医疗成像医学成像

背景情况:

  • 椎关节疼痛和不稳定性是需要成像的常见临床问题.
  • 对于放射科医生来说,了解骨关节炎前的成像发现至关重要.
  • 中侧骨关节 (MPFL) 是稳定骨的关键.

研究的目的:

  • 为了为放射科医生提供一个全面的审查的骨骨架不稳定性.
  • 要突出相关的解剖学,临床评估,诊断成像和治疗选择.
  • 总结了对常见骨关节异常的验证测量结果.

主要方法:

  • 对放射科医生相关的骨关节不稳定性的关键方面进行审查.
  • 讨论解剖学,临床表现和成像方式 (X光学,MRI,动态成像).
  • 验证的放射测量对不对齐,发育不良和侧面化的总结.

主要成果:

  • 中部骨带 (MPFL) 是侧面骨位移的主要抑制因素.
  • 骨关节异常,如三角膜发育不稳定性倾向于不稳定.
  • 放射学是最初的成像选择;MRI在手术前是常见的.

结论:

  • 准确的成像和解剖学的理解对于管理骨骨架不稳定至关重要.
  • 保守治疗主要用于疼痛;手术 (例如,MPFL重建) 是不稳定的选择.
  • 术后成像评估并发症,如移植失败和亚脱.