hey this is vedika agrawal this presentation is to easily understand anatomy of radio ulnar joint. the topics are made easily understand throug diagrams. reference book : BD Chaurasia

1. RADIO-ULNAR JOINT
PREPARED BY – Vedika Agrawal
(BATCH 2019-20)
ROLL NUMBER – 98
GUIDED AND MOTIVATED BY – Dr. Priya Mehta
MGM ALLIED HEALTH SCIENCE INSTITUTE,
INDORE

2.  Introduction
 Pivot joint
 Types of joint
 Interosseous membrane
 Movements
 Clinical anatomy
Contents

3.  The radius and ulna joined to each other at superior
and inferior radio-ulnar joints.
 The joint provides pivot variety of movement.
 It is responsible for pronation and supination of
forearm.
INTRODUCTION

4. PIVOT JOINT
 It is also called trochoid joint.
 Articular surface comprises of a central bony pivot
(peg) surrounded by an osseocartilaginous ring.
 Movements are permitted in one plane around a
vertical axis.
 Its seen in radio-ulnar as well as in atlanto-axial joint.

5. Superior radioulnar joint
 Inferior radioulnar joint
Medial radioulnar joint
TYPES OF RADIOULNAR
JOINT

6.  Articular surface
1. head of radius
2. radial notch of Ulna
 Ligaments
1. Annular ligament - it cover 4/5th of Osseo-fibrous ring,
within the head of radius rotates .It is attached to
margins of the radial notch of ulna and continuous
with capsule of elbow joint.
2. Quadrate ligament - it extends from neck of radius to
lower margin of radial notch of ulna
 Nerve supply - Musculocutaneous, median, and radial
nerve
 Blood Supply - Anastomoses around the lateral side of
the elbow join.
Superior radioulnar joint

7.  Articular Surface
1. Head Of Ulna
2. Ulnar Notch Of Radius
 Ligaments
1. The capsule surrounds the joint. Upper weak part is
enavigated by the synovial membrane to form a recess
in front of interosseous membrane.
2. The apex of triangular fibro cartilaginous articular disc
is attached to the base of the styloid process of the ulna,
and the base to the lower margin of the ulnar notch of
the radius.
 Blood supply - Anterior and posterior interosseous
arteries
 Nerve supply - Anterior and posterior interosseous
nerve .
INFERIOR RADIOULNAR JOIN

8. MEDIAL RADIOULNAR
JOINT
 It is syndesmosis type fibrous joint.
 Articular Surface
1. joined by interosseous membrane attached to
interosseous borders of radius and ulna .
2. It is attached to posterior border of medial
surface at lower end of radius .

9. INTEROSSEOUS
MEMBRANE
 The interosseous membrane connects the shaft of the radius and
ulna.
 The fibers of the membrane run downwards and medially from
radius to ulna .
1. Superiorly - it begins 2-3 cm below the radial tuberosity .
2. Inferiorly - a little above its lower margin.
3. Anterior surface - it is related with flexor compartment of
forearm.
4. Posterior surface - it is related with extensor compartment
of forearm .
 These two bones also connected by the oblique cord which
extends from the tuberosity of the radius to the tuberosity of the
ulna. (Direction of fibers is opposite to interosseous membrane.)

10. Functions OfInterosseous
Membrane
 It binds the radius and ulna to each other .
 it provides attachments to many muscles .
 it transmits forces applied to the radius (through hand)
to the ulna .
 separates the forearm into flexor and extensor
compartment.

11. SUPINATION
 In a semi flexed elbow , the palm is turned upwards.
 Supination is more powerful than pronation because
it is an anti-gravity movement.
 It is brought about by following muscles –
1. supinator
2. biceps brachii
 Trick to learn --- beggars always supinate….

12. PRONATION
 In a semi flexed elbow the palm is turned downwards.
 During pronation head of radius spins within annular
ligament. As radius comes medially across the lower
part of ulna.
 Pronation is brought about following muscles –
1. Pronator quadratus
2. Pronator teres
 Trick to learn --- kings always pronate…

13. ClinicalAnatomy
 Around 50% of supination and 50% of pronation are
generally required to perform many of the routine
activities.
 Its movement may also be lost due to disuse atrophy or
paralysis of upper limb.
 It can be bought back to normal thorough
physiotherapeutic exercises and machines like
pronation supination manual device and pronation
supination CMP device respectively.
 During supination radius and ulna are parallel to each
other . During Pronation , radius crosses over the ulna.
 In synostosis (fusion) of upper end of radius and ulna ,
Pronation is not possible.