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Related Concept Videos

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: 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...
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...
Arteries of the Upper Limbs01:12

Arteries of the Upper Limbs

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Changes in the Appendicular Skeleton with Age01:09

Changes in the Appendicular Skeleton with Age

The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
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Herniated Intervertebral Disc l: Introduction01:29

Herniated Intervertebral Disc l: Introduction

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Related Experiment Video

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Development of a Novel Internal Fixation Model for Rat Radial Fractures: Fracture Healing Assessment and Dorsal Root Ganglion Isolation
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Developmental dislocation of the radial head.

M Amako1, K Masada, H Ohno

  • 1From the Department of Orthopaedic Surgery, National Defense Medical College, Saitama, Japan.

Journal of Shoulder and Elbow Surgery
|September 11, 2012
PubMed
Summary
This summary is machine-generated.

Developmental dislocation of the radial head is rare. This case highlights an unusual bilateral anterior radial head dislocation in a child, with redislocation occurring even after surgical intervention.

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Area of Science:

  • Pediatric Orthopedics
  • Developmental Abnormalities
  • Elbow Biomechanics

Background:

  • Developmental dislocation of the radial head is an uncommon condition.
  • This case presents a rare instance of bilateral anterior radial head dislocation in a pediatric patient.

Purpose of the Study:

  • To report an unusual case of bilateral developmental dislocation of the radial head.
  • To describe the clinical presentation, intraoperative findings, and treatment outcomes.

Main Methods:

  • Case report of a 6-year-old boy with bilateral anterior radial head dislocation.
  • Intraoperative assessment of the mechanism of dislocation during forearm pronation.
  • Surgical intervention including ulnar osteotomy and annular ligament reconstruction.

Main Results:

  • The patient experienced atraumatic, sequential anterior dislocation of both radial heads.
  • Intraoperative findings indicated the radial head dislocated during pronation, abutting the ulna.
  • Surgical management, including ulnar osteotomy, did not prevent redislocation.

Conclusions:

  • Bilateral developmental dislocation of the radial head is exceptionally rare.
  • The mechanism involves pronation and radial abutment against the ulna.
  • Current surgical techniques may not be sufficient to prevent redislocation in such cases.