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Related Concept Videos

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 torque...
651
Unsymmetric Bending - Angle of Neutral Axis01:15

Unsymmetric Bending - Angle of Neutral Axis

751
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...
751
Design Example: Traverse Angle Computations01:25

Design Example: Traverse Angle Computations

250
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...
250
Angle of Twist - Elastic Range01:13

Angle of Twist - Elastic Range

668
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...
668
Adjusting a Traverse01:12

Adjusting a Traverse

297
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...
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Field Procedure for Staking Out Curves01:26

Field Procedure for Staking Out Curves

349
Staking out curves is an essential process in construction to ensure the accurate alignment of structures along a curved path. This task involves positioning stakes at calculated locations corresponding to the curve's design, effectively translating plans into physical markers in the field. The process begins by determining the geometric parameters of the curve, including the radius, central angle, and tangent distances. These parameters are critical for identifying key points such as the...
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Related Experiment Video

Updated: Dec 20, 2025

Polytetrafluoroethylene PTFE as a Suture Material in Tendon Surgery
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How to stich? 90 degrees: The perfect angle.

Mohammed Shafaat1, David O'Regan1

  • 1Department of Cardiac Surgery, Yorkshire Heart Centre, Leeds General Infirmary, Great George Street, Leeds, LS1 3EX, United Kingdom.

The Surgeon : Journal of the Royal Colleges of Surgeons of Edinburgh and Ireland
|May 24, 2020
PubMed
Summary

Ninety degrees is the ideal suturing angle, easily identifiable by the human eye. This finding supports improved surgical training by focusing on fundamental needle skills for better patient outcomes.

Keywords:
Deliberate practiceSkills acquisitionSurgical competenceSurgical trainingTechnical skills

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Area of Science:

  • Surgical techniques and skills assessment
  • Medical education and training

Background:

  • Lack of standardized teaching for needle entry orthogonal to tissue planes.
  • Absence of objective methods to assess needle angles and consequences of inaccuracies.
  • Need for a foundational angle for effective surgical training.

Purpose of the Study:

  • Deconstruct suturing techniques to identify the optimal needle angle.
  • Demonstrate that 90 degrees is the perfect suturing angle.
  • Establish a visually identifiable angle for surgical education.

Main Methods:

  • Study to identify 90 degrees as an easily recognizable angle.
  • Presented volunteers with angles ranging from 86° to 94° and 41° to 49°.
  • Volunteers instructed to identify 90° and 45° angles.

Main Results:

  • 92% of volunteers correctly identified at least one 90° angle.
  • 72% identified both presented 90° angles.
  • 90° angle was significantly more identifiable than 45° angles.

Conclusions:

  • 90° is readily identifiable by the human eye, making it suitable for teaching.
  • Objective assessment of surgical skills should emphasize basic needle skills and suturing angles.
  • Training should progress from basic to advanced skills using simulation and correlating with operative progress.