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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.
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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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Apical-Radial (A-R) Pulse Assessment
The A-R pulse assessment involves simultaneous evaluation of the apical and radial pulses. When the apical and radial pulse rates vary, this assessment helps identify a pulse deficit.
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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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The subclavian artery transitions into the axillary artery as it exits the chest and enters the axillary region. This artery is critical for supplying blood to the shoulder area, including the head of the humerus, through the humeral circumflex arteries. As the vessel continues into the upper arm or brachium, it becomes the brachial artery. This artery plays a key role in vascularizing the brachial region and bifurcates at the elbow into several branches. These branches include the deep...
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Updated: Jul 26, 2025

Reverse Total Shoulder Arthroplasty
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Perched Anteromedial Radial Head Dislocation.

Allison Rao1, Edward Wu1, Jonathan Braman1

  • 1Department of Orthopedic Surgery, University of Minnesota Medical School, Minneapolis, MN.

Journal of Hand Surgery Global Online
|June 16, 2023
PubMed
Summary
This summary is machine-generated.

A rare perched anteromedial radial head dislocation, not previously reported, was successfully treated with closed reduction. This case highlights the challenges of closed reduction for elbow injuries and the need for surgical preparedness.

Keywords:
Closed reductionCoronoidRadial headRadial head dislocationRadius

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Area of Science:

  • Orthopedic Surgery
  • Traumatology
  • Radiology

Background:

  • Radial head dislocations are common elbow injuries.
  • Perched radial head dislocations are rare, with anteromedial variants undocumented.
  • This study addresses a unique case of perched anteromedial radial head dislocation.

Observation:

  • A patient presented with an isolated radial head dislocation.
  • The dislocation was perched specifically on the coronoid process.
  • Radiographic images confirmed the rare injury pattern without associated coronoid fracture or complete elbow dislocation.

Findings:

  • The case represents the first reported instance of perched anteromedial radial head dislocation.
  • Successful closed reduction was achieved, restoring full range of motion and function.
  • This contrasts with previously reported literature, which lacks documentation of this specific injury or its non-operative management.

Implications:

  • Closed reduction of such injuries can be challenging, even under anesthesia.
  • Surgical settings should allow for conversion to open reduction if closed methods fail.
  • This case expands the understanding of radial head dislocation injury patterns and treatment outcomes.