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Related Concept Videos

Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

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...
Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it instrumental in...
Relative Motion Analysis using Rotating Axes - Acceleration01:22

Relative Motion Analysis using Rotating Axes - Acceleration

Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame. The absolute velocity of point B is determined by adding the absolute velocity of point A, the relative velocity of point B in the rotating frame, and the effects caused by the angular velocity within the rotating frame.
Time differentiation is...
Relative Motion Analysis - Velocity01:24

Relative Motion Analysis - Velocity

A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
Relative Motion Analysis - Acceleration01:10

Relative Motion Analysis - Acceleration

A slider-crank mechanism converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider. The movement of the slider-crank is an example of general plane motion as the fluctuating angle between the crank and the connecting rod. Consider a segment AB where point A is at the end of the slider and point B is on the diametrically opposite end to point A, on a crack. The variance in...
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...

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Related Experiment Video

Updated: May 19, 2026

Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography
06:09

Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography

Published on: March 12, 2021

Analyzing shoulder translation with navigation technology.

S Zakani1, G Venne, E J Smith

  • 1Department of Mechanical and Materials Engineering, Queen's University, Kingston, ON, Canada. zakanis@me.queensu.ca

International Journal of Computer Assisted Radiology and Surgery
|August 3, 2012
PubMed
Summary
This summary is machine-generated.

Posterior capsular tightness increases anterior shoulder translation, suggesting surgical release may treat instability in athletes. This study used surgical navigation on cadaver shoulders to analyze motion.

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Area of Science:

  • Orthopedic surgery
  • Biomechanics
  • Sports medicine

Background:

  • Anterior shoulder instability is common in athletes due to repetitive overhead motions.
  • Current treatments often focus on anterior laxity, overlooking other contributing factors.
  • Posterior capsular tightness is a potential, yet understudied, cause of shoulder instability.

Purpose of the Study:

  • To investigate if posterior capsular tightness contributes to anterior shoulder instability.
  • To analyze anterior translational motion using advanced surgical navigation technology.
  • To challenge the assumption that anterior laxity is the sole cause of instability.

Main Methods:

  • Utilized four cadaver shoulders with intact rotator cuff and capsule.
  • Employed opto-electronic surgical navigation devices for precise motion tracking.
  • Assessed shoulder motion under varying degrees of induced posterior capsular tightness (0mm, 5mm, 10mm).

Main Results:

  • Significant increase in anterior translation observed with posterior capsular tightening (p < 0.05).
  • The effect was most pronounced during combined abduction and rotation, mimicking overhead sports movements.
  • Shoulder translation during flexion was not significantly affected by capsular dissection state (p > 0.95).

Conclusions:

  • Surgical navigation is a viable tool for analyzing cadaveric shoulder biomechanics.
  • Findings suggest that posterior capsular release could be a minimally invasive treatment for chronic shoulder instability.
  • This approach may offer a new therapeutic strategy for athletes experiencing shoulder dislocations from sports activities.