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Related Concept Videos

Bones of the Upper Limb: Radius01:09

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

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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...
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Bones of the Upper Limb: Humerus01:19

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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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Muscles that Move the Arm01:31

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Nine muscles are involved in arm movements. Two of these, the pectoralis major and latissimus dorsi, originate from the axial skeleton and are called axial muscles. The other seven originate from the scapula and are called the scapular muscles.
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The muscles that move the forearms can be divided into four groups: forearm flexors, forearm extensors, forearm pronators, and forearm supinators. The flexors and extensors act on the elbow joint, while the pronators and supinators act on the radioulnar joints.
Forearm Flexors
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Related Experiment Video

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Reverse Total Shoulder Arthroplasty
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Irreducible posterolateral elbow dislocation.

Cameron T Atkinson, Nick D Pappas, Donald H Lee1

  • 1Vanderbilt Hand and Upper Extremity Center, Vanderbilt Orthopaedics Institute, Nashville, TN. Donald.h.lee@vanderbilt.edu.

American Journal of Orthopedics (Belle Mead, N.J.)
|February 20, 2014
PubMed
Summary
This summary is machine-generated.

This study details an irreducible elbow dislocation caused by the radial head buttonholing through the lateral ligamentous complex. Open reduction and ligament repair were necessary for this rare operative injury.

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Area of Science:

  • Orthopedic Surgery
  • Traumatology
  • Anatomy

Background:

  • Elbow dislocations are common high-energy traumatic injuries.
  • Most elbow dislocations are treatable with non-surgical methods.
  • Understanding joint congruity is crucial for elbow stability.

Observation:

  • A rare case of irreducible elbow dislocation was observed.
  • Reduction was obstructed by the radial head entrapped within the lateral ligamentous complex.
  • This specific entrapment represents a unique variant of elbow dislocation.

Findings:

  • Open reduction was performed to address the entrapped radial head.
  • Surgical release of the entrapped radial head was necessary.
  • Repair of the damaged lateral ligamentous complex was conducted.

Implications:

  • Clinicians must recognize this specific mechanism of irreducible dislocation.
  • Prompt surgical intervention is indicated for this operative elbow injury.
  • Accurate diagnosis and treatment are vital for restoring elbow joint function.