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Related Concept Videos

Ankle Joint01:10

Ankle Joint

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The ankle is formed by the talocrural joint (crural = leg). It consists of the articulations between the talus bone of the foot and the distal ends of the tibia and fibula of the leg. The superior aspect of the talus bone is square-shaped and has three areas of articulation. The top of the talus articulates with the inferior tibia. This is the portion of the ankle joint that carries the body weight between the leg and foot. The sides of the talus are firmly held in position by the articulations...
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Rotational Motion about a Fixed Axis01:26

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A rigid body's rotation around a fixed axis makes every point within it trace a circular path around a specific line or point. The term given to this type of spinning is defined by the angular position, symbolized by the angle θ. This angle is gauged from a static reference line to the revolving object. From this angular position, any variation is referred to as angular displacement, denoted by dθ. The extent of this displacement can be calculated in degrees, radians, or...
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Rotation of Asymmetric Top01:11

Rotation of Asymmetric Top

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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 - 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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Principle of Angular Impulse and Momentum01:23

Principle of Angular Impulse and Momentum

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The angular impulse and momentum principle provides insights into how forces applied at a distance from an object's rotational axis influence its angular velocity. It builds upon the crucial relationship between the moment of force and angular momentum. By integrating this equation, substituting the limits for the initial and final times, a comprehensive expression representing the angular impulse and momentum principle is derived.
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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.
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Related Experiment Video

Updated: Jul 23, 2025

A Mouse Model of Ankle-Subtalar Complex Joint Instability
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A Mouse Model of Ankle-Subtalar Complex Joint Instability

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Rotational ankle instability: A current concept review.

Rocco Aicale1,2, Nicola Maffulli1,2,3,4

  • 1Department of Musculoskeletal Disorders, Faculty of Medicine and Surgery, University of Salerno, Fisciano, Italy.

Journal of Orthopaedic Surgery (Hong Kong)
|July 14, 2023
PubMed
Summary
This summary is machine-generated.

Ankle sprains can lead to chronic instability if not diagnosed promptly. Arthroscopic all-inside repair of medial ligament complex tears effectively treats both medial ankle instability and rotational ankle instability.

Keywords:
CLAIMAIRAIanklearthroscopychronic instabilityligamentous repair

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Area of Science:

  • Orthopedics
  • Sports Medicine
  • Anatomy

Background:

  • Ankle sprains are common injuries with potential for chronic instability.
  • Untreated ligament tears can lead to long-term ankle problems.
  • Medial ligament complex (MLC) injuries can cause medial ankle instability (MAI) or rotational ankle instability (RAI).

Purpose of the Study:

  • To evaluate effective management strategies for ankle sprains.
  • To understand risk factors for chronic problems and recurrent sprains.
  • To assess the efficacy of arthroscopic all-inside repair for MLC tears in MAI and RAI.

Main Methods:

  • Review of ankle sprain recovery and risk factors.
  • Discussion of conservative and surgical treatment options for ankle instability.
  • Focus on arthroscopic all-inside repair for MLC tears.

Main Results:

  • Prompt diagnosis is crucial to prevent chronic ankle instability.
  • Specific MLC injuries are associated with MAI and RAI.
  • Arthroscopic all-inside repair of MLC tears is an effective treatment for both MAI and RAI.

Conclusions:

  • Early diagnosis and appropriate management of ankle sprains are essential.
  • Arthroscopic all-inside repair offers an effective surgical solution for MLC tears causing MAI and RAI.
  • This approach addresses ligament insufficiency and intra-articular pathologies.