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相关概念视频

Rotation of Asymmetric Top01:11

Rotation of Asymmetric Top

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By definition, a spherically symmetric body has the same moment of inertia about any axis passing through its center of mass. This situation changes if there is no spherical symmetry. Since most rigid bodies are not spherically symmetric, these require special treatment.
The relationship between the angular momentum of any rigid body and its angular velocity, both of which are vectors, involves the moment of inertia. The moment of inertia is a scalar quantity only for spherically symmetric...
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Angle of Twist - Elastic Range01:13

Angle of Twist - Elastic Range

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Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
923
Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

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An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the...
870
Bending of Members Made of Several Materials01:11

Bending of Members Made of Several Materials

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In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...
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Unsymmetric Bending - Angle of Neutral Axis01:15

Unsymmetric Bending - Angle of Neutral Axis

1.0K
Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
When a bending moment is applied at an angle θ concerning the vertical axis of a symmetrical member, it can be resolved into components along the member's principal...
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Design Example: Traverse Angle Computations01:25

Design Example: Traverse Angle Computations

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Traverse angle computations are a critical component of surveying, used to compute the internal angles within a closed traverse. A traverse consists of a series of connected lines forming a closed loop, often used for land boundary delineation or mapping. Calculating the internal angles ensures accuracy in the traverse geometry and is essential for checking survey data integrity.The process begins with known azimuths and bearings of the traverse sides. Internal angles at each vertex are...
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相关实验视频

Updated: May 6, 2026

Cone Beam Intraoperative Computed Tomography-based Image Guidance for Minimally Invasive Transforaminal Interbody Fusion
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使用可角度调节的子进行斜侧侧体间融合.

Nam-Su Chung1, Han-Dong Lee1, Jong-Min Jeon1

  • 1Department of Orthopaedic Surgery, Ajou University School of Medicine, 164 World Cup-ro, Yeongtong-gu, Suwon, Geyounggi-do, 16499, South Korea.

European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society
|February 4, 2025
PubMed
概括

角度可调节的子可以在L4-L5处改善子旋转和定位,特别是在斜侧侧体间融合 (OLIF) 过程中,特别是对于具有高阴茎的患者. 这种技术在脊柱融合手术中提供了更好的放射性结果.

关键词:
可以调节角度的子子倾斜性的子伊利亚克峰峰的高度斜侧侧体间融合 斜侧侧体间融合放射学结果 放射学结果

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科学领域:

  • 脊柱外科手术 脊柱外科手术
  • 整形外科手术 整形外科手术
  • 退行性腰部疾病是一种退行性腰部疾病.

背景情况:

  • 直角子旋转对于斜侧侧体间融合 (OLIF) 是至关重要的.
  • 在L4-L5 OLIF期间,下脊可以限制子的放置.
  • 可调节角度的子旨在克服沟的局限性,但它们的有效性需要进一步研究.

研究的目的:

  • 在L4-L5 OLIF中比较常规和可调角之间的放射性结果.
  • 评估可调节角度的子对子斜率和前部定位的影响.
  • 为了确定可调节角度的子在患有高阴茎的患者中的实用性.

主要方法:

  • 对90名接受L4-L5OLIF治疗的患者进行了回顾性研究,这些患者患有退行性腰部疾病.
  • 第一组 (41名患者) 接受了传统的子;第二组 (49名患者) 接受了可调角度的子.
  • 对照了包括子斜率,位置,前高度,融合速率和沉降在内的放射性结果.

主要成果:

  • 两组之间上脊的平均高度没有显著差异.
  • 与可调角度组 (8.3°) 相比,传统子组 (12.1°) 的子倾斜度更大.
  • 在常规子组 (6.3毫米) 中,子的前部位置更好,而在角度可调组 (4.7毫米) 中,子的前部位置更好.

结论:

  • 角度可调节的子可促进子上方直角旋转和子前方定位在L4-L5 OLIF中.
  • 可调节角度的子系统对于L4-L5 OLIF在患有高阴茎的患者中特别有益.
  • 这项技术增强了在具有挑战性的解剖学中实现最佳子放置的手术选择.