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Related Concept Videos

Two-Dimensional Force System01:20

Two-Dimensional Force System

888
A two-dimensional system in mechanical engineering involves the analysis of motion and forces in a plane. A two-dimensional force vector can be resolved into its components as:
888
Unsymmetric Bending - Angle of Neutral Axis01:15

Unsymmetric Bending - Angle of Neutral Axis

287
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...
287
Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

267
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...
267
Design Example: Traverse Angle Computations01:25

Design Example: Traverse Angle Computations

61
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...
61
Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

394
Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
Here, in order to determine the magnitude of velocity and acceleration for point...
394
Two-Dimensional Force System: Problem Solving01:29

Two-Dimensional Force System: Problem Solving

552
Solving problems related to two-dimensional force systems is an essential aspect of mechanics and engineering. By applying the principles of vector analysis and force equilibrium, one can determine the effect of multiple forces acting on an object in a two-dimensional space.
The first step to solving a two-dimensional force system problem is to draw a free-body diagram of the object under consideration. This diagram helps identify all the external forces acting on the object, including their...
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Related Experiment Video

Updated: Jun 13, 2025

Treatment of Ankle Osteoarthritis with Total Ankle Replacement Through a Lateral Transfibular Approach
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The Alpha Angle.

Seper Ekhtiari1, Olivia Fairhurst2, Lily Mainwaring2

  • 1Division of Orthopaedic Surgery, University of Toronto, Toronto, Ontario, Canada.

The Journal of Bone and Joint Surgery. American Volume
|September 16, 2024
PubMed
Summary
This summary is machine-generated.

The alpha angle measurement can be unreliable, especially with radiographs. Advanced 3D imaging offers more accurate quantification of cam lesions, improving clinical relevance.

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Area of Science:

  • Orthopedics
  • Radiology
  • Biomedical Engineering

Background:

  • The alpha angle is a key metric for diagnosing femoroacetabular impingement (FAI).
  • Originally defined using magnetic resonance imaging (MRI), its measurement has been adapted across various imaging modalities.
  • Literature often relies on radiographs, which present challenges in accurate alpha angle quantification.

Purpose of the Study:

  • To evaluate the reliability of alpha angle measurements across different imaging techniques.
  • To highlight the limitations of traditional methods in capturing the 3D nature of cam lesions.
  • To explore the potential of advanced imaging technologies for more accurate alpha angle assessment.

Main Methods:

  • Review of existing literature on alpha angle measurement techniques.
  • Analysis of the reliability of measurements from radiographs, ultrasound, and MRI.
  • Discussion of 3D imaging modalities and intraoperative/dynamic imaging options.

Main Results:

  • Alpha angle measurement is particularly unreliable on radiographs and ultrasound.
  • The 'circle of best-fit' method on multiple radiographic views is recommended to mitigate errors.
  • "Eyeballing" or estimating the alpha angle from radiographs should be avoided.
  • Cam lesions are dynamic 3D problems not adequately defined by a single angle.

Conclusions:

  • Traditional methods for alpha angle measurement, especially on radiographs, have significant limitations.
  • The dynamic and 3D nature of cam lesions necessitates advanced imaging techniques.
  • Modern 3D and dynamic imaging offer more precise and clinically relevant quantification of the alpha angle.