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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

Bones of the Upper Limb: Radius

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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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Related Experiment Video

Updated: May 3, 2026

A Structured Rehabilitation Protocol for Improved Multifunctional Prosthetic Control: A Case Study
06:58

A Structured Rehabilitation Protocol for Improved Multifunctional Prosthetic Control: A Case Study

Published on: November 6, 2015

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Semiconstrained distal radioulnar joint prosthesis.

Christiana Savvidou1, Erin Murphy2, Emilie Mailhot3

  • 1Fellow in Hand Surgery, University of Louisville School of Medicine, Louisville, Kentucky ; Christine Kleinert Institute for Hand and Microsurgery, Louisville, Kentucky.

Journal of Wrist Surgery
|January 18, 2014
PubMed
Summary

Total distal radioulnar joint (DRUJ) arthroplasty using the Aptis prosthesis improved forearm function, range of motion, and lifting capacity in patients with DRUJ dysfunction. Most patients experienced better pain control and daily living activities after surgery.

Keywords:
distal radioulnar jointwrist arthritiswrist prosthesis

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Area of Science:

  • Orthopedic surgery
  • Biomedical engineering
  • Reconstructive surgery

Background:

  • Distal radioulnar joint (DRUJ) dysfunction arises from instability, abutment, or incongruity, often necessitating ulnar head excision or fusion due to arthritis.
  • Existing procedures focus on pronation/supination but often neglect grip strength and lifting capacity assessments.

Purpose of the Study:

  • To evaluate the long-term (5-year) outcomes of total DRUJ arthroplasty using the Aptis DRUJ prosthesis.
  • To assess improvements in range of motion, strength, lifting capacity, pain, and daily function after DRUJ replacement.

Main Methods:

  • A prospective study of 35 patients undergoing total DRUJ arthroplasty with the Aptis prosthesis for various DRUJ dysfunctions.
  • Data collection included patient demographics, range of motion, strength, lifting capacity, pain, and functional assessments of both operated and non-operated extremities.

Main Results:

  • The majority of patients achieved adequate range of motion and improved strength and lifting capacity on the operated side.
  • Significant improvements were noted in pain levels and the ability to perform activities of daily living.
  • Complications occurred in 12 patients, including ECU tendinitis, ectopic bone formation, and stem loosening.

Conclusions:

  • The Aptis total DRUJ replacement prosthesis serves as a viable alternative to salvage procedures for dysfunctional DRUJ.
  • It effectively restores forearm function, enabling a full range of motion and adequate grip and lifting capabilities for daily activities.