Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Bones of the Upper Limb: Ulna

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...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Ensuring bone-to-bone contact reduces interfragmentary strain in forearm shaft plating: A finite element study.

Clinical biomechanics (Bristol, Avon)·2026

Same author

Mechanical effects of different cast immobilization positions in Colles' fracture: a finite element analysis investigation.

Journal of biomechanics·2026

Same author

Age-related changes in bone mineral density of the scaphoid and distal radius: A quantitative computed tomography study.

Bone·2025

Same author

Multi-Camera Hand Motion Analysis For Puncture Technique Training.

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference·2025

Same author

Accuracy of a Superficial Landmark of the Recurrent Branch of the Median Nerve and Anatomical Features of Transverse Muscle Fibres Observed During Carpal Tunnel Release.

The journal of hand surgery Asian-Pacific volume·2025

Same author

Recovery of Forearm Bone Strength After Plate Removal: A Finite Element Analysis Study.

The Journal of hand surgery·2022

Search research articles

Related Experiment Video

Updated: May 7, 2026

A Contusive Model of Unilateral Cervical Spinal Cord Injury Using the Infinite Horizon Impactor

A Contusive Model of Unilateral Cervical Spinal Cord Injury Using the Infinite Horizon Impactor

Published on: July 24, 2012

Influence of Dynamic Factors on Ulnar Impaction Syndrome: An Axial Compression Test Using Fresh-Frozen Cadavers.

Kinshiro Nabeshima¹, Yusuke Matsuura¹, Takahiro Yamazaki¹

¹Department of Orthopaedic Surgery, Graduate School of Medicine, Chiba University, Chiba, Japan.

The Journal of Hand Surgery

|April 3, 2026

Summary

Dynamic ulnar impaction increases with axial load, causing the ulna and lunate to shift closer. This biomechanical study clarifies the mechanism of ulnar impaction syndrome.

Keywords:

Biomechanics cadaveric study cartilage compression ulnar impaction syndrome wrist joint

More Related Videos

Proximal Cadaveric Femur Preparation for Fracture Strength Testing and Quantitative CT-based Finite Element Analysis

Proximal Cadaveric Femur Preparation for Fracture Strength Testing and Quantitative CT-based Finite Element Analysis

Published on: March 11, 2017

A Method to Estimate Cadaveric Femur Cortical Strains During Fracture Testing Using Digital Image Correlation

A Method to Estimate Cadaveric Femur Cortical Strains During Fracture Testing Using Digital Image Correlation

Published on: September 14, 2017

Related Experiment Videos

Last Updated: May 7, 2026

A Contusive Model of Unilateral Cervical Spinal Cord Injury Using the Infinite Horizon Impactor

A Contusive Model of Unilateral Cervical Spinal Cord Injury Using the Infinite Horizon Impactor

Published on: July 24, 2012

Proximal Cadaveric Femur Preparation for Fracture Strength Testing and Quantitative CT-based Finite Element Analysis

Proximal Cadaveric Femur Preparation for Fracture Strength Testing and Quantitative CT-based Finite Element Analysis

Published on: March 11, 2017

A Method to Estimate Cadaveric Femur Cortical Strains During Fracture Testing Using Digital Image Correlation

A Method to Estimate Cadaveric Femur Cortical Strains During Fracture Testing Using Digital Image Correlation

Published on: September 14, 2017

Area of Science:

Orthopedic biomechanics
Upper extremity anatomy
Wrist joint mechanics

Background:

Ulnar impaction syndrome is a clinical concern.
The biomechanical basis of dynamic ulnar impaction requires further elucidation.

Purpose of the Study:

To biomechanically analyze dynamic ulnar impaction under axial loading conditions.
To investigate the relationship between applied load and changes in ulnar variance.

Main Methods:

Ten fresh-frozen cadaveric upper limbs were utilized.
Axial loads (0-300 N) were applied to the wrist with the elbow at 90° flexion.
Posteroanterior radiographs were obtained to measure ulnar variance and ulna displacement.

Main Results:

Mean ulnar variance increased from 1.70 mm to 3.00 mm with increasing load.
A significant positive correlation (r = 0.67) was found between axial load and ulnar variance.
The ulna displaced distally (1.12 mm) and radially (0.81 mm); the lunate shifted proximally (0.38 mm) and ulnarly (0.43 mm).

Conclusions:

Axial loading linearly increases ulnar variance, demonstrating dynamic ulnar impaction.
Findings enhance understanding of dynamic ulnar impaction biomechanics.
Load-dependent changes are crucial for assessing and treating ulnar impaction syndrome.