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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...
Bones of the Upper Limb: Ulna01:15

Bones of the Upper Limb: Ulna

The ulna and radius are parallel bones of the antebrachium or the forearm. The ulna lies medially and consists of a bony tip called the olecranon process at its proximal end. This hook-like projection articulates with the olecranon fossa of the humerus and forms the "hinged" ulnohumeral part of the elbow joint. This joint facilitates forearm extension and flexion while preventing its hyperextension. Similarly, the coronoid process, another bony projection on the proximal/anterior side of the...
Types of Impact01:30

Types of Impact

Impacts can be classified in various forms, primarily under two subgroups: central impact and oblique impact. A central impact occurs when two objects collide head-on, possessing opposite velocities aligned along the line of impact. Conversely, an oblique impact occurs when two objects collide at an angle, resulting in a modification of both direction and velocity.
The coefficient of restitution is a metric for understanding the dynamics of impacts. It quantifies the ratio of relative velocity...
Impulse01:13

Impulse

According to Newton’s second law of motion, the rate of change of the momentum of an object is the net external force acting on it. The total change in momentum between two timepoints thus depends on both the external force acting on it and the time over which it acts. Describing this mathematically, the total change of an object’s motion is proportional to the force vector and the time over which it is applied. This product is called impulse.
Additionally, it can be shown that the total...
Bones of the Upper Limb: Radius01:09

Bones of the Upper Limb: Radius

The radius is longer of the two bones that make up the human antebrachium or forearm. At the proximal end, the radius articulates with the capitulum of the humerus and the radial notch of the ulna to form the elbow joint. At the distal end, the radius articulates with the ulna via the ulnar notch, forming the distal radioulnar joint. Distally, the radius also attaches to the carpal wrist bones (scaphoid and lunate) to form the radiocarpal joint.
The radius has a nail-shaped head, and a short...
Bones of the Upper Limb: Humerus01:19

Bones of the Upper Limb: Humerus

The upper limb consists of the arm, forearm, wrist, and hand bones. The humerus is the single bone of the upper arm region. Proximally, it has a large, spherical, smooth head that articulates with the glenoid cavity of the scapula to form the glenohumeral or shoulder joint. The margin of the head is the anatomical neck, a residual epiphyseal plate. Laterally it extends to form bony projections called the greater tubercle and the lesser tubercle. Next to the tubercles is the surgical neck, a...

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Related Experiment Video

Updated: Jun 8, 2026

A Contusive Model of Unilateral Cervical Spinal Cord Injury Using the Infinite Horizon Impactor
07:28

A Contusive Model of Unilateral Cervical Spinal Cord Injury Using the Infinite Horizon Impactor

Published on: July 24, 2012

Ulnar impaction.

Douglas M Sammer1, Marco Rizzo

  • 1Division of Plastic Surgery, Washington University School of Medicine, Suite 1150, NW Tower, 660 South Euclid Avenue, Campus Box 8238, St Louis, MO 63110, USA.

Hand Clinics
|October 19, 2010
PubMed
Summary
This summary is machine-generated.

Ulnar impaction syndrome causes wrist pain due to excessive load on the ulnocarpal joint. Treatment options include nonoperative management or surgical procedures like ulnar-shortening osteotomy or wafer procedure.

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Treatment with Locking Intramedullary Nailing for Intertrochanteric Fracture of the Femur Utilizing a New Awl with a Distal Positioner
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Treatment with Locking Intramedullary Nailing for Intertrochanteric Fracture of the Femur Utilizing a New Awl with a Distal Positioner

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Last Updated: Jun 8, 2026

A Contusive Model of Unilateral Cervical Spinal Cord Injury Using the Infinite Horizon Impactor
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Published on: July 24, 2012

Treatment with Locking Intramedullary Nailing for Intertrochanteric Fracture of the Femur Utilizing a New Awl with a Distal Positioner
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Area of Science:

  • Orthopedics
  • Hand Surgery
  • Musculoskeletal Disorders

Background:

  • Ulnar impaction syndrome is a frequent cause of ulnar-sided wrist pain.
  • This degenerative condition results from excessive load across the ulnocarpal joint.
  • It is often associated with positive ulnar variance, either congenital or acquired.

Purpose of the Study:

  • To discuss the etiology of ulnar impaction syndrome.
  • To outline the diagnostic methods for ulnar impaction syndrome.
  • To review the treatment options for ulnar impaction syndrome.

Main Methods:

  • Diagnosis relies on clinical examination.
  • Radiographic studies support the clinical diagnosis.
  • Treatment involves nonoperative measures or surgical intervention if conservative care fails.

Main Results:

  • The article provides a comprehensive overview of ulnar impaction syndrome.
  • It details the underlying causes and pathological changes.
  • It compares primary surgical interventions: ulnar-shortening osteotomy and wafer procedure.

Conclusions:

  • Ulnar impaction syndrome requires accurate diagnosis for effective management.
  • Nonoperative treatment should be attempted first.
  • Surgical options, including ulnar-shortening osteotomy and wafer procedure, are effective when conservative treatment fails.