Proximal Radioulnar Joint (Rotation)

Black Belt Wiki is a free martial arts wiki. We will help you with Shotokan Kata, Taekwondo Forms, Kicks, Punches, Grappling, Aikido, Goju-Ryu, Krav Maga, Bo Staff, Kyokushin, Judo, Terminology, etc. You can also learn about different martial arts styles. This wiki will also improve your martial arts agility, balance, conditioning, flexibility, speed, etc. Please help others by adding info to this wiki. Page Date - 24 May 2015 16:04

Proximal Radioulnar Joint (Rotation) - proximal being the end of these bones that is nearest the elbow.

Bones: Head of Radius and Ulna closest to the humerus.

Cartilage: There is a capsule that connects all three bones of the elbow.

Ligaments: The annular ligament binds the radius to the ulnar.

Muscles: Pronator teres which attaches at the humerus and radius (from the inside of the elbow closest to the body) and then runs diagonally to the radius (the inside bone of the forearm) about three quarters of the way towards the writs, this muscle pronates the hand turning the palm down. Usually grouped as part of the elbow because of the muscle attachment to the humerus. The supinator (stretching from the tip of the humerus to the radius, covering close to a third of it) and assistance from the biceps brachii supinate the hand turning the palm downwards.

Joint type: Pivot joint.

Mechanics: The Ponator muscle is on the inside of the arm therefor when contracted turns the arm inwards pronating the palm of the hand downwards. The Supnator muscle is on the outside of the arm therefor when contracted turns the arm outwards supinating the palm of the hand upwards.

Range of motion: The mechanics of this pronator allows for the hand to turn from neutral to slightly over 90 degrees downwards and the reverse as with the supinator. When the complimentary muscles contract the opposite muscle must still provide enough elasticity for the total rotation of the forearm to be about 180 degrees.

Manipulation: These are fairly small muscles so a more than 90 degree force supination or pronation of the forearm will push the elasticity of the muscle and the connective alignments of the bones causing them to lock and a throw easy to follow or with a snap like force the destruction of ligaments and cartilage.

For information on additional joints please refer back to the Joints page.


Please support this free martial arts wiki
by buying books & gear via the Amazon links below.


At no extra cost to you, Black Belt Wiki receives a small commission on purchases made through the links in this section. As an Amazon Associate, Black Belt Wiki earns from qualifying purchases such as martial arts books. This helps us to keep this wiki free for all visitors. Thank you for your support!!!

Latest Martial Arts Pages Added to Black Belt Wiki


Instructors. Black Belts & Martial Arts Enthusiasts

Help beginners by adding information to this website.
In return, we will link back to your martial arts school, blog or website.
This will help you to attract new students or readers!

Martial Arts Video of the Month - June 2018





Material on this wiki may not be copied or reproduced. All rights reserved.
This website is copyright protected under the US Digital Millennium Copyright Act.
For other terms & conditions, please read our legal disclaimer and privacy policy.



This site is for informational purposes only. All martial arts techniques and fitness exercises should be supervised by a trained martial arts instructor in order to prevent injuries and to ensure the proper technique is utilized. If you have had an injury or are in pain, please see a doctor before starting or continuing any martial arts and/or physical fitness program.



Martial Arts
Shoes

By Brand

Martial Arts
Knee & Ankle Support

Popular
Martial Arts Books

Flexibility

How To Books

Karate

Taekwondo

Philosophy