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Related Concept Videos

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: 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...
Ankle Joint01:10

Ankle Joint

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...
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 26, 2026

Novel Triple-Loop Technique for Suturing TFCC Injuries without Transosseous Tunnel
08:27

Novel Triple-Loop Technique for Suturing TFCC Injuries without Transosseous Tunnel

Published on: May 23, 2025

Acute distal radioulnar joint instability.

Grant E Garrigues1, Vani Sabesan, J Mack Aldridge

  • 1the Division of Orthopaedic Surgery, Duke University Medical Center, Durham, NC.

Journal of Surgical Orthopaedic Advances
|January 14, 2009
PubMed
Summary

The distal radioulnar joint (DRUJ) is vital for forearm rotation and hand function. Prompt evaluation and stabilization of acute DRUJ instability prevent chronic issues and preserve upper extremity function.

Area of Science:

  • Orthopedics
  • Anatomy
  • Biomechanics

Background:

  • The distal radioulnar joint (DRUJ) is essential for forearm pronosupination and overall upper extremity function.
  • Its stability relies on the triangular fibrocartilage complex, particularly the dorsal and palmar radioulnar ligaments.
  • Disruptions to these stabilizers or joint congruity significantly impair hand function.

Purpose of the Study:

  • To emphasize the critical role of the DRUJ in forearm function.
  • To highlight the importance of recognizing and managing acute DRUJ instability.
  • To underscore the benefits of early intervention in preventing chronic instability.

Main Methods:

  • Review of anatomical stabilizers of the DRUJ.
  • Discussion of the pathophysiology of DRUJ instability.

Related Experiment Videos

Last Updated: Jun 26, 2026

Novel Triple-Loop Technique for Suturing TFCC Injuries without Transosseous Tunnel
08:27

Novel Triple-Loop Technique for Suturing TFCC Injuries without Transosseous Tunnel

Published on: May 23, 2025

  • Emphasis on clinical recognition and management strategies for acute injuries.

    • Main Results:

    • Injuries causing acute DRUJ instability often accompany other forearm-wrist trauma.
    • A high index of suspicion is crucial for identifying associated DRUJ instability.
    • Early evaluation and stabilization of acute DRUJ injuries are key.

    Conclusions:

    • Acute distal radioulnar joint instability requires prompt recognition and management.
    • Failure to address acute instability can lead to chronic problems and functional deficits.
    • Early intervention is paramount to avoid the complexities of chronic distal radioulnar joint instability.