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

Search research articles

Related Experiment Videos

A new device for external fixation.

¹Department of Orthopedics, University Hospital, Linköping, Sweden.

Acta Orthopaedica Scandinavica

|December 1, 1988

Summary

This summary is machine-generated.

A new universal ball joint design offers superior mechanical stability. This optimized joint provides significantly higher rigidity and resistive moments compared to existing systems like the Hoffmann universal ball joint.

Related Concept Videos

You might also read

Related Articles

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

Sort by

Same author

Use of LigaSure vessel sealing system versus conventional axillary dissection in breast cancer patients: a retrospective comparative study.

BMC surgery·2022

Same author

A Strong and Fortuitous Case of Dyspnea.

The Journal of the Louisiana State Medical Society : official organ of the Louisiana State Medical Society·2017

Same author

Observation and Structure Determination of an Oxide Quasicrystal Approximant.

Physical review letters·2016

Same author

Screening for chromosomal abnormalities by first trimester combined screening and noninvasive prenatal testing.

Ultraschall in der Medizin (Stuttgart, Germany : 1980)·2014

Same author

[Information seeking on the internet: what information are pregnant women seeking?].

Revue medicale suisse·2013

Same author

Fetal gastroschisis: a comparison of second vs. third-trimester bowel dilatation for predicting bowel atresia and neonatal outcomes.

Ultraschall in der Medizin (Stuttgart, Germany : 1980)·2011

Same journal

The treatment of bowleg in rickets.

Acta orthopaedica Scandinavica·2010

Same journal

Tuberculosis of the bones and joints of the foot, including an analysis of the material of the Danish Disablement Pension Board of the years 1921-1940.

Acta orthopaedica Scandinavica·2010

Same journal

Herniated nucleus pulposus in a child of twelve years.

Acta orthopaedica Scandinavica·2010

Same journal

On fracture of the carpal scaphoid; a method for operative treatment of inveterate fractures.

Acta orthopaedica Scandinavica·2010

Same journal

Arthrodesis in the treatment of tuberculous coxitis sequelae.

Acta orthopaedica Scandinavica·2010

Same journal

Fibular autograft and silicone implant arthroplasty after resection of giant cell tumor of the metacarpal--a case report with 9-year follow-up.

Acta orthopaedica Scandinavica·2005

See all related articles

Area of Science:

Mechanical Engineering
Biomedical Engineering
Orthopedics

Background:

Universal ball joints are critical components in various mechanical systems, including orthopedic external fixation devices.
Existing designs, such as the Hoffmann universal ball joint, have limitations in terms of rigidity and load-bearing capacity.
Optimizing the mechanical design of ball joints is essential for improving the performance and stability of complex frames.

Purpose of the Study:

To establish the optimal mechanical design of a simple universal ball joint.
To evaluate the mechanical performance of the new ball joint design under various load conditions.
To compare the rigidity and stability of a complete unilateral frame using the new ball joints against a Hoffman quadrilateral system.

Main Methods:

Related Experiment Videos

A ball-and-socket joint model was utilized to determine the optimal mechanical design.
The maximum resistive moment was measured for a specific tightening torque moment.
A complete unilateral frame, comprising two ball joints and a connecting tube, was subjected to testing in three principal planes and torsion.

Main Results:

The new universal ball joint achieved a maximum resistive moment ratio of 14 (70-72 Nm / 5 Nm), significantly higher than Hoffmann (1.0-4.3) and Orthofix (1.1-1.6) joints.
The complete unilateral frame demonstrated four times greater rigidity in the anteroposterior plane compared to the Hoffman quadrilateral system.
The new system exhibited similar performance in axial load and lateral bending, and was 64% more rigid in torsion.

Conclusions:

The optimized universal ball joint design offers substantially improved mechanical properties, particularly in terms of resistive moment and rigidity.
Unilateral frames constructed with the new ball joints provide enhanced stability and rigidity, outperforming traditional systems like the Hoffman quadrilateral.
This advancement holds potential for improving the efficacy of orthopedic external fixation devices and other mechanical applications requiring robust joint performance.