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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...
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...
Spinal Nerves: Plexus I01:22

Spinal Nerves: Plexus I

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.
The Cervical Plexus
The cervical plexus, formed by the anterior rami of the first four...
Arteries of the Upper Limbs01:12

Arteries of the Upper Limbs

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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Related Experiment Video

Updated: Jun 29, 2026

Ultrasound-Guided Needle Release Combined with Corticosteroid Injection for the Treatment of Supinator Syndrome
05:18

Ultrasound-Guided Needle Release Combined with Corticosteroid Injection for the Treatment of Supinator Syndrome

Published on: May 26, 2023

Indications for ulnar head replacement.

Richard A Berger1

  • 1Department of Orthopedic Surgery, Mayo School of Continuing Medical Education, College of Medicine, Mayo Clinic, Rochester, Minnesota, USA.

American Journal of Orthopedics (Belle Mead, N.J.)
|October 18, 2008
PubMed
Summary
This summary is machine-generated.

Ulnar head replacement using endoprosthesis restores forearm stability by reestablishing mechanical contact between the distal radius and ulna. This review covers indications, contraindications, outcomes, and implant designs for ulnar head arthroplasty.

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Area of Science:

  • Orthopedic surgery
  • Biomechanical engineering
  • Reconstructive surgery

Background:

  • Forearm instability often results from distal radius and ulna issues.
  • Ulnar head excision can lead to forearm pathomechanics.
  • Endoprosthetic replacement offers a solution for restoring forearm stability.

Purpose of the Study:

  • To review the clinical application of ulnar head replacement.
  • To discuss the mechanics and outcomes associated with forearm endoprosthetic implants.
  • To explore various implant designs used in ulnar head arthroplasty.

Main Methods:

  • Literature review of clinical studies and biomechanical analyses.
  • Discussion of surgical indications and contraindications.
  • Analysis of theoretical principles behind implant arthroplasty.

Main Results:

  • Endoprosthetic implantation is a proven method for restoring distal radioulnar joint function.
  • Successful outcomes depend on appropriate patient selection and implant design.
  • Understanding forearm mechanics is crucial for effective treatment.

Conclusions:

  • Ulnar head replacement provides a stable foundation for the forearm.
  • Comprehensive evaluation of indications, contraindications, and outcomes is essential.
  • Further research into optimal implant designs can enhance patient results.