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Related Concept Videos

Adjusting a Traverse01:12

Adjusting a Traverse

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...
Design Example: Traverse Angle Computations01:25

Design Example: Traverse Angle Computations

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...
Errors in Taping01:18

Errors in Taping

Errors in taping arise from multiple factors that can significantly impact measurement accuracy in surveying. Misalignment of the tape, often due to human error, is one primary source. A skilled rear tapeman, using a telescope, can help correct alignment by guiding the head tapeman; however, human limitations still lead to small inaccuracies. These errors may include misplacement of pins or inaccurate tape readings due to common visual confusions, such as mistaking a six for a nine. Such...

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A Postoperative Evaluation Guideline for Computer-Assisted Reconstruction of the Mandible
10:42

A Postoperative Evaluation Guideline for Computer-Assisted Reconstruction of the Mandible

Published on: January 28, 2020

How to evaluate three dimensional angle error from plain radiographs.

Chen-Kun Liaw1, Tai-Yin Wu, Sheng-Mou Hou

  • 1Department of Orthopaedics, Shin Kong Wu Ho-Su Memorial Hospital and Health System, Taipei city 11101, Taiwan; Department of Orthopaedics, College of Medicine, National Taiwan University & Hospital, Taipei city 10002, Taiwan; Department of Healthcare Information and Management, School of Health Technology, Ming Chuan University, TaoYuan city 33348, Taiwan; College of Medicine, Fu Jen Catholic University, New Taipei city 24205, Taiwan.

The Journal of Arthroplasty
|July 16, 2013
PubMed
Summary
This summary is machine-generated.

Calculating 3D angle error from plain radiographs is crucial when CT/MRI are unavailable. This study presents a novel trigonometric formula, implemented in Excel, to determine post-operative angle deviations, aiding surgical assessments.

Keywords:
plain radiographthree dimensional angletwo dimensional angle

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Area of Science:

  • Orthopedic surgery
  • Medical imaging analysis
  • Biomechanical engineering

Background:

  • Three-dimensional (3D) angle assessment is vital in orthopedic procedures.
  • Limitations in accessing computed tomography (CT) or magnetic resonance imaging (MRI) for all patients necessitate alternative evaluation methods.
  • Plain radiographs are widely available and cost-effective imaging modalities.

Purpose of the Study:

  • To develop a method for calculating 3D angle error using only plain radiographs.
  • To provide a user-friendly tool for assessing post-operative angular deviations in orthopedic surgery.
  • To establish a practical approach for evaluating surgical outcomes when advanced imaging is not feasible.

Main Methods:

  • Derivation of a mathematical formula using vector and trigonometric principles.
  • Calculation of angle error from pre-operative goal angles to post-operative result angles.
  • Implementation of the formula into Microsoft Excel for enhanced usability.

Main Results:

  • A validated formula capable of computing 3D angle error from two perpendicular plain radiographs.
  • A user-friendly Excel-based tool for practical application in clinical settings.
  • Demonstrated applicability for evaluating outcomes in total knee replacement (TKR), corrective osteotomies, and fracture fixation.

Conclusions:

  • The developed method offers a viable alternative for 3D angle error evaluation using plain radiographs.
  • The Excel tool simplifies the assessment of surgical accuracy and patient outcomes.
  • This approach enhances the accessibility and efficiency of post-operative orthopedic assessments.