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Related Concept Videos

Design Example: Measuring Distance Between Two Points with Obstructions01:10

Design Example: Measuring Distance Between Two Points with Obstructions

When measuring distances in areas with physical obstructions, such as a lake in a field, surveyors must employ techniques to calculate accurate lengths without direct line measurements. One effective method is the offset technique, which allows for precise distance estimation over inaccessible stretches.In this scenario, a surveyor must measure a side of an area that crosses a lake. Since the measuring tape cannot span the lake, the surveyor begins by establishing a baseline that aligns with...
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To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...
Adjusting a Traverse01:12

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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...
Areas Within Irregular Boundaries01:26

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Common Leveling Mistakes and Errors01:17

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A survey team is tasked with determining the elevation difference between points Point A and Point B, separated by uneven terrain. They use a leveling instrument and a leveling rod.Common MistakesMisreading the Rod: During a backsight reading at Point A, the instrumentman observes the rod partially obscured by tall grass. Instead of reading 1.135 m, they mistakenly record 1.735 m due to the misalignment of the crosshair with the wrong graduation. This error adds 0.600 m to all subsequent...
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Analyzing a supported beam under unsymmetrical loadings is essential in structural engineering to understand how beams respond to varied force distributions. This analysis involves calculating the deflection and identifying points where the slope of the beam is zero, which are crucial for ensuring structural stability and functionality.
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Anogenital Distance and Perineal Measurements of the Pelvic Organ Prolapse (POP) Quantification System
03:49

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Published on: September 20, 2018

Methods for assessing leg length discrepancy.

Sanjeev Sabharwal1, Ajay Kumar

  • 1Division of Pediatric Orthopaedics, Department of Orthopaedics, UMDNJ-New Jersey Medical School, Newark, NJ, USA. sabharsa@umdnj.edu

Clinical Orthopaedics and Related Research
|October 7, 2008
PubMed
Summary
This summary is machine-generated.

Accurate measurement of leg-length discrepancy (LLD) is crucial for treatment. CT scanograms offer reliable and comprehensive LLD assessment with lower radiation exposure compared to other imaging methods.

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Area of Science:

  • Orthopedics
  • Radiology
  • Diagnostic Imaging

Background:

  • Accurate quantification of leg-length discrepancy (LLD) is essential for effective treatment planning.
  • Various clinical and imaging modalities exist for LLD assessment, but their comparative reliability and accuracy are not fully established.

Purpose of the Study:

  • To systematically evaluate and compare the reliability and accuracy of different methods for measuring leg-length discrepancy.
  • To explore the advantages and limitations of each assessment technique.

Main Methods:

  • Systematic literature search identifying 42 articles on LLD assessment tools.
  • Evaluation of clinical methods (tape measure, standing blocks) and imaging modalities (scanogram, teleoroentgenogram, CT scanogram, MRI).

Main Results:

  • Clinical methods are useful for screening but less accurate than imaging.
  • CT scanogram (teleoroentgenogram) provides reliable measurements with minimal magnification and comprehensive assessment.
  • CT scanogram involves similar costs but less radiation exposure than other methods.

Conclusions:

  • CT scanogram, particularly the lateral scout view, is recommended for LLD assessment, especially in patients with knee flexion deformities.
  • MRI is a promising modality for LLD assessment but requires further investigation before routine clinical use.