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Related Concept Videos

Bones of the Upper Limb: Ulna01:15

Bones of the Upper Limb: Ulna

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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: 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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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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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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Related Experiment Video

Updated: Nov 14, 2025

A Mouse Model of Ankle-Subtalar Complex Joint Instability
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Understanding Acute Distal Radioulnar Joint Instability.

Shobhit V Minhas, Louis W Catalano

    Bulletin of the Hospital for Joint Disease (2013)
    |March 11, 2021
    PubMed
    Summary

    Acute distal radioulnar joint (DRUJ) instability, often missed, can severely impair wrist function. Understanding the anatomy of disrupted restraints is key for effective treatment, often requiring surgery.

    Area of Science:

    • Orthopedic Surgery
    • Anatomy
    • Traumatology

    Background:

    • Acute distal radioulnar joint (DRUJ) instability is a significant cause of forearm and wrist dysfunction.
    • Injuries involve the triangular fibrocartilage complex, interosseous membrane, or radius/ulna fractures.
    • Proper treatment necessitates a thorough understanding of the complex DRUJ anatomy.

    Purpose of the Study:

    • To emphasize the importance of recognizing and understanding acute distal radioulnar joint (DRUJ) instability.
    • To highlight the anatomical basis for DRUJ stability and the consequences of its disruption.
    • To inform treatment strategies for DRUJ injuries based on anatomical derangements.

    Main Methods:

    • Review of anatomical structures critical for DRUJ stability.

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  • Analysis of common injury mechanisms leading to DRUJ instability.
  • Correlation of anatomical disruption with clinical presentation and treatment options.

    • Main Results:

    • Disruption of key anatomical restraints, including the triangular fibrocartilage complex and interosseous membrane, leads to DRUJ instability.
    • Underestimation of these injuries can result in significant functional deficits.
    • Treatment success is contingent upon addressing the specific anatomical abnormalities.

    Conclusions:

    • Comprehensive anatomical knowledge is essential for diagnosing and managing acute DRUJ instability.
    • Surgical intervention is frequently required for unstable DRUJ injuries.
    • Restoration of anatomical integrity guides effective treatment and functional recovery.