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Related Concept Videos

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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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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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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Spinal Nerves: Plexus I01:22

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Nerve plexuses are networks of interlacing nerves that serve as communication hubs to distribute and organize nerve action across various body regions. The nerve plexuses are organized into the cervical plexus located in the neck region, brachial plexus in the shoulder area, lumbar plexus found in the lower back, sacral plexus situated in the pelvis, and coccygeal plexus located in the coccygeal region.
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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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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.
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Distal Radioulnar Joint Instability.

Simon Bruce Murdoch Maclean1,2

  • 1Tauranga Hospital, Tauranga, New Zealand.

The Journal of Hand Surgery Asian-Pacific Volume
|August 22, 2025
PubMed
Summary
This summary is machine-generated.

Distal radioulnar joint (DRUJ) instability results from complex factors affecting joint stability. Understanding its causes, presentation, and imaging is crucial for effective management of acute and chronic cases.

Keywords:
AnatomyDistal radioulnar joint instabilityDistal radius fractureKinematicsReconstructionTFCC

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Area of Science:

  • Orthopedic Surgery
  • Anatomy
  • Biomechanics

Background:

  • The distal radioulnar joint (DRUJ) is critical for forearm rotation and wrist function.
  • Instability of the DRUJ presents a significant clinical challenge due to its complex anatomy and reliance on soft tissues for stability.

Purpose of the Study:

  • To provide a comprehensive review of distal radioulnar joint (DRUJ) instability.
  • To elucidate the anatomy, kinematics, etiology, and imaging findings associated with DRUJ instability.
  • To outline current surgical management strategies for both acute and chronic DRUJ instability.

Main Methods:

  • Systematic literature review focusing on DRUJ instability.
  • Analysis of anatomical structures contributing to DRUJ stability.
  • Review of diagnostic imaging modalities for DRUJ pathology.
  • Evaluation of surgical techniques for DRUJ instability.

Main Results:

  • DRUJ stability depends on osseous, chondral, and ligamentous structures, often acting in combination.
  • Various etiologies contribute to DRUJ instability, necessitating a thorough diagnostic approach.
  • Effective management requires understanding the specific contributing factors in acute and chronic presentations.

Conclusions:

  • A comprehensive understanding of DRUJ anatomy and biomechanics is essential for diagnosing and managing instability.
  • Accurate imaging and etiological assessment guide the selection of appropriate surgical interventions.
  • This review synthesizes current knowledge to aid clinicians in managing DRUJ instability.