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Related Concept Videos

Impact01:30

Impact

Impact occurs when two bodies collide, leading to the application of impulsive forces between them. Analyzing impact mechanics involves considering two colliding particles moving along a line known as the line of impact, which passes through their centers and is perpendicular to the contact plane.
When particles with different initial velocities collide, they induce deformation by applying equal and opposite impulses. At the point of maximum deformation, the particles move together with...
Stability of structures01:14

Stability of structures

In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...
Impact Loading01:19

Impact Loading

Impact loading occurs when a moving object collides with a stationary structure, such as a rod with a uniform cross-sectional area fixed at one end. Under these conditions, the rod absorbs the kinetic energy from the striking object, leading to deformation and subsequent stress development. As the rod returns to its original position and reaches maximum stress, the absorbed energy, initially manifested as kinetic energy, transforms entirely into strain energy.
In cases of elastic deformation,...
Upward Impending Motion01:21

Upward Impending Motion

A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. Its operation is based on converting the force applied at its handle into a torsional moment, causing the upward impending motion of the screw. This movement is accomplished by overcoming the static friction between the threads of the screw and the jack.
To better comprehend how a screw jack functions, consider the completely unraveled thread as a block in contact with the...
Impulse-Momentum Theorem00:49

Impulse-Momentum Theorem

The total change in the motion of an object is proportional to the total force vector acting on it and the time over which it acts. This product is called impulse, a vector quantity with the same direction as the total force acting on the object.
By writing Newton's second law of motion in terms of the momentum of an object and the external force acting on it, and simultaneously using the definition of the impulse vector, it can be shown that the total impulse on an object is equal to its net...
Mitral Valve Prolapse I: Introduction01:27

Mitral Valve Prolapse I: Introduction

IntroductionThe mitral valve, one of the heart's four valves, regulates blood flow. These valves have flaps that open and close to direct blood properly through the heart and body. During each heartbeat, the flaps open for blood to pass through and seal shut to prevent backflow. Specifically, the mitral valve opens to allow blood flow from the heart's upper left chamber to the lower left chamber. It then closes securely as the lower left chamber contracts to pump blood to the body, preventing...

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Articles linked to this work by shared authors, journal, and citation graph.

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Favorable Outcomes Following Elbow Ulnar Collateral Ligament Reconstruction and Repair, Though Repair Associated with Increased Risk of Revision Surgery.

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Currently Available Large Language Models Do Not Provide Musculoskeletal Treatment Recommendations That Are Concordant With Evidence-Based Clinical Practice Guidelines.

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Understanding How ChatGPT May Become a Clinical Administrative Tool Through an Investigation on the Ability to Answer Common Patient Questions Concerning Ulnar Collateral Ligament Injuries.

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Outcomes of ultrasound-guided injections of Bennett lesions of the shoulder.

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Low Rates of Postoperative Complications and Revision Surgery After Primary Medial Elbow Ulnar Collateral Ligament Repair.

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Related Experiment Video

Updated: May 7, 2026

An Inertial Measurement Unit Based Method to Estimate Hip and Knee Joint Kinematics in Team Sport Athletes on the Field
06:52

An Inertial Measurement Unit Based Method to Estimate Hip and Knee Joint Kinematics in Team Sport Athletes on the Field

Published on: May 26, 2020

Microinstability and internal impingement in overhead athletes.

Lauchlan Chambers1, David W Altchek

  • 1Hospital for Special Surgery, 535 East 70th Street, New York, NY 10021, USA.

Clinics in Sports Medicine
|October 2, 2013
PubMed
Summary

Overhead athletes with glenohumeral joint instability often develop shoulder pathologies. Conservative treatment is recommended first, but arthroscopic suture plication offers the best outcomes if surgery is necessary.

Keywords:
Arthroscopic suture plicationInternal impingementLabral debridementMicroinstabilityRotator cuff

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Murine Hind Limb Explant Model for Studying the Mechanobiology of Achilles Tendon Impingement

Published on: December 8, 2023

Area of Science:

  • Orthopedic Surgery
  • Sports Medicine
  • Biomechanics

Background:

  • The glenohumeral joint requires a balance between dynamic and static stabilizers for overhead athletes.
  • Hypermobility is necessary for overhead activities, yet stability is crucial to prevent subluxation.
  • Microinstability and internal impingement are common in overhead athletes, often with associated pathologies.

Purpose of the Study:

  • To review the management of glenohumeral joint instability in overhead athletes.
  • To outline conservative and surgical treatment options for associated shoulder pathologies.

Main Methods:

  • Literature review of studies on glenohumeral joint instability, microinstability, and internal impingement in overhead athletes.
  • Analysis of conservative management strategies, including physical therapy protocols.
  • Evaluation of surgical techniques, focusing on arthroscopic procedures.

Main Results:

  • Conservative treatment, including rotator cuff and scapular stabilizer strengthening and posterior capsule stretching, should be attempted for 3-6 months.
  • Arthroscopic suture plication combined with treatment of concomitant lesions yields the best clinical outcomes when surgery is indicated.

Conclusions:

  • A structured approach involving conservative management followed by surgical intervention is essential for overhead athletes with glenohumeral instability.
  • Targeted exercises and appropriate surgical techniques are key to restoring function and preventing subluxation.