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Related Concept Videos

Kinematic Equations for Rotation01:30

Kinematic Equations for Rotation

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In mechanics, when one observes a rigid body in rotational motion with constant angular acceleration, it is possible to establish equations for its rotational kinematics. This process resembles how linear kinematics are dealt with in simpler motion studies.
For instance, imagine a point A on a rigid body engaged in circular motion. The translational velocity of this particular point can be calculated by taking the time derivatives of the displacement equation, which essentially measures the...
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By definition, a spherically symmetric body has the same moment of inertia about any axis passing through its center of mass. This situation changes if there is no spherical symmetry. Since most rigid bodies are not spherically symmetric, these require special treatment.
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Rotation with Constant Angular Acceleration - I01:37

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If angular acceleration is constant, then we can simplify equations of rotational kinematics, similar to the equations of linear kinematics. This simplified set of equations can be used to describe many applications in physics and engineering where the angular acceleration of a system is constant.
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Rotation with Constant Angular Acceleration - II01:16

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Kinematics is the description of motion. The kinematics of rotational motion discusses the relationships between rotation angle, angular velocity, angular acceleration, and time. One can describe many things with great precision using kinematics, but kinematics does not consider causes. For example, a large angular acceleration describes a very rapid change in angular velocity without any consideration of its cause. Thus, rotational kinematics does not represent the laws of nature.
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Apparent Weight and the Earth's Rotation01:28

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Since all objects on the Earth's surface move through a circle every 24 hours, there must be a net centripetal force on each object, directed towards the center of that circle. The points of the north and south poles are the only exception to this rule.
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Related Experiment Video

Updated: Jan 30, 2026

Arthroscopic Management of Massive Irreparable Rotator Cuff Tears: Whole Rotator Cable Reconstruction Using Proximal Biceps Tendon Autograft
07:22

Arthroscopic Management of Massive Irreparable Rotator Cuff Tears: Whole Rotator Cable Reconstruction Using Proximal Biceps Tendon Autograft

Published on: June 6, 2025

639

Subacromial decompression surgery for rotator cuff disease.

Teemu V Karjalainen1, Nitin B Jain, Cristina M Page

  • 1Monash Department of Clinical Epidemiology, Cabrini Institute and Department of Epidemiology and Preventive Medicine, School of Public Health and Preventive Medicine, Monash University, Melbourne, VIC, Australia, 3144.

The Cochrane Database of Systematic Reviews
|February 2, 2019
PubMed
Summary

Subacromial decompression surgery for rotator cuff disease likely offers no significant benefit over placebo for pain or function. This review found no evidence of clinical improvement, questioning its routine use after non-operative treatments fail.

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A Novel Arthroscopic Medial Knot-Tying Suture-Bridge Repair with Rip-Stop Technique for Rotator Cuff Tears
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Knotless Independent Double-Row Repair and Biceps Augmentation for Anterosuperior Rotator Cuff Tears
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Knotless Independent Double-Row Repair and Biceps Augmentation for Anterosuperior Rotator Cuff Tears

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Related Experiment Videos

Last Updated: Jan 30, 2026

Arthroscopic Management of Massive Irreparable Rotator Cuff Tears: Whole Rotator Cable Reconstruction Using Proximal Biceps Tendon Autograft
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Arthroscopic Management of Massive Irreparable Rotator Cuff Tears: Whole Rotator Cable Reconstruction Using Proximal Biceps Tendon Autograft

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A Novel Arthroscopic Medial Knot-Tying Suture-Bridge Repair with Rip-Stop Technique for Rotator Cuff Tears
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A Novel Arthroscopic Medial Knot-Tying Suture-Bridge Repair with Rip-Stop Technique for Rotator Cuff Tears

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Knotless Independent Double-Row Repair and Biceps Augmentation for Anterosuperior Rotator Cuff Tears
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Knotless Independent Double-Row Repair and Biceps Augmentation for Anterosuperior Rotator Cuff Tears

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Area of Science:

  • Orthopedic Surgery
  • Musculoskeletal Disorders
  • Evidence-Based Medicine

Background:

  • Rotator cuff disease often leads to surgical intervention after conservative treatments fail.
  • Previous reviews indicated uncertain clinical benefits of subacromial decompression surgery.
  • This review focuses on rotator cuff disease, excluding full-thickness tears.

Purpose of the Study:

  • To evaluate the benefits and harms of subacromial decompression surgery.
  • Comparisons include placebo, no intervention, and non-surgical interventions.
  • Focus on rotator cuff disease without full-thickness tears.

Main Methods:

  • Systematic review and meta-analysis of randomized and quasi-randomized controlled trials (RCTs).
  • Searched multiple databases (CENTRAL, MEDLINE, Embase, etc.) up to October 2018.
  • Primary comparison: subacromial decompression versus placebo surgery; secondary: versus exercises or non-operative treatment.

Main Results:

  • High-certainty evidence shows subacromial decompression provides no improvement in pain, shoulder function, or quality of life up to one year compared to placebo.
  • Moderate-certainty evidence suggests probable lack of clinically important benefit in global treatment success.
  • Adverse event rates were low (<3%), with uncertain differences between groups; serious adverse events estimated <1%.

Conclusions:

  • Current evidence does not support subacromial decompression for painful shoulder impingement symptoms.
  • The procedure offers no clinically significant advantages over placebo, exercises, or non-operative management.
  • Low rates of adverse events, but potential for serious complications exists.