Chapter 6
The Elbow and Radioulnar Joints
Manual of Structural
Kinesiology
PE 3320
HPER
The Elbow & Radioulnar
Joints
Most upper extremity
movements involve the ___________ & ___________
joints
Usually grouped together due
to close anatomical relationship
Elbow joint movements may be
clearly distinguished from those of the radioulnar joints
Radioulnar joint movements
may be distinguished from those of the wrist
Bones
___________ is much larger
proximally than radius
Radius is much ___________
distally than ulna
Scapula & humerus serve
as ___________ attachments for muscles that ___________ & ___________ the
elbow
Ulna & radius serve as
___________ attachments for these same muscles
Scapula, humerus, & ulna
serve as ___________ attachments for muscles that ___________ & ___________
the radioulnar joints
Distal attachments of
radioulnar joint muscles are located on ___________
Bony landmarks
medial condyloid ridge
olecranon process
coranoid process
radial tuberosity
Key bony landmarks for wrist
& hand muscles
medial epicondyle
lateral epicondyle
lateral supracondylar ridge
Joints
___________ or
___________-type joint
Allows only ___________ &
___________
2 interrelated joints
___________ joint
___________ joints
Radial collateral ligament
provides lateral stability & is rarely injured
Annular ligament provides a
sling effect around radial head for stability
Elbow moves from 0 degrees of
extension to 145 to 150 degrees of flexion
Radioulnar joint
___________ or
___________-type joint
Radial head rotates around at
proximal ___________
___________ radius rotates
around distal ulna
Annular ligament maintains
radial head in its joint
Radioulnar joint
___________ 80 to 90 degrees
from neutral
___________ 70 to 90 degrees
from neutral
Movements
___________movement of
forearm to shoulder by bending the elbow to decrease its angle
___________movement of
forearm away from shoulder by straightening the elbow to increase its angle
Pronation
___________ rotary movement
of radius on ulna that results in hand moving from palm-up to palm-down
position
Supination
___________ rotary movement
of radius on ulna that results in hand moving from palm-down to palm-up
position
Muscles
Elbow flexors
___________
___________
___________
Weak assistance from
___________
Elbow extensor
___________
___________ provides
assistance
Radioulnar pronators
___________
___________
___________
Radioulnar supinators
___________
___________
___________
Muscles
³Tennis elbow" -
____________________________________________________________
known lateral ___________
associated with ___________
& ___________ activities
___________ epicondylitis
somewhat ___________common
known as ___________ elbow
associated with
___________& ___________ near their origin on medial epicondyle
Both conditions involve
muscles which ___________ elbow but act primarily on wrist & hand
Muscles
Anterior
Primarily flexion &
pronation
Biceps brachii
Brachialis
Brachioradialis
Pronator teres
Pronator quadratus
Muscles
Posterior
Primarily extension &
supination
Triceps brachii
Anconeus
Supinator
Biceps Brachii Muscle
Flexion of elbow
Brachialis Muscle
True flexion of elbow
Brachioradialis Muscle
Flexion of elbow
Triceps Brachii Muscle
All heads: extension of elbow
Anconeus Muscle
Pronator Teres Muscle
Pronator Quadratus Muscle
Supinator Muscle
Elbow Flexion
Ex. ___________
Agonists
___________
___________
___________
Elbow Extension
EX. ___________
Agonists
___________
___________
Radioulnar Pronation
Agonists
___________
___________
___________
Radioulnar Supination
Ex. ___________
Agonists
___________
___________
___________