没有使用X射线的科布角估计,使用干部旋转角和不可预测情况的特征
Takuma Fukuzawa1, Hiroki Oba2, Shota Ikegami1
1Shinshu University School of Medicine, Matsumoto, Nagano, Japan.
概括
干部旋转角度 (ATR) 与青少年异常脊椎病 (AIS) 的科布角度有很强的相关性. 特定的ATR值可以预测超过25°和45°的曲线,有助于在不需要X光照的情况下做出治疗决定.
科学领域:
- 整形医学
- 放射学
- 生物医学工程
背景情况:
- 青少年特异性脊椎病 (AIS) 需要准确的科布角测量治疗.
- 脊柱旋转角度 (ATR) 是用于评估脊柱形的临床指标.
- 从ATR预测科布角度可以减少对X光成像的需求.
研究的目的:
- 在AIS患者中调查Cobb角度和ATR测量之间的相关性.
- 确定ATR是否可以预测对治疗决策相关的科布角值.
- 为了确定从ATR中难以预测Cobb角度的情况.
主要方法:
- 对176名AIS患者 (11至12岁) 的回顾性分析.
- 使用脊柱计测量ATR;用X射线测量科布角,瑞塞等级,冠状平衡 (C7PL) 和关节角.
- 低估组定义为预测的科布角>1 SD低于实际的科布角.
主要成果:
- 在ATR和科布角之间发现强烈的正相关性 (r=0.883,P<0.001).
- 预测科布角分别为7.5°和10.5°的ATR切线值分别为25°和45°.
- 低估与更大的科布角,更大的C7PL偏差和右肩升高有关.
结论:
- 在AIS中,ATR是可靠的Cobb角度预测指标,具有临床决策的切断值.
- 虽然对于较大的曲线来说,准确的预测是具有挑战性的,但ATR提供了一种非放射性方法来指导支架或手术治疗的考虑.
- 这种方法可能有助于减少AIS管理中的辐射暴露.
相关概念视频
Design Example: Traverse Angle Computations
138
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...
138
Adjusting a Traverse
101
In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...
101
General Case of Eccentric Axial Loading
246
Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from symmetrical bending, which are essential for designing structures to withstand different loading conditions.
Consider a member subjected to equal and opposite forces that are applied along a line that does not coincide with the member's neutral axis. In unsymmetrical...
Consider a member subjected to equal and opposite forces that are applied along a line that does not coincide with the member's neutral axis. In unsymmetrical...
246
Angle of Twist: Problem Solving
391
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...
391
Angle of Twist - Elastic Range
392
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...
392
Unsymmetric Bending - Angle of Neutral Axis
435
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...
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...
435


