The Elbow and Radioulnar Joints

Anatomy and Kinesiology420:024

The Elbow and Radioulnar Joints Usually grouped together due to close anatomical

relationship Elbow joint movements may be clearly distinguished

from those of the radioulnar joints Often grouped together due to proximity Entirely different

Structurally = 2, functionally = 1 Elbow joint distal attachment:

Ulna Radioulnar joint distal attachment:

Radius

Objectives Bones, bony landmarks and joints Muscles Movements

The Elbow and Radioulnar Joints Elbow Joint

Diarthrodial uniaxial hinge joint Plane? Axis? Movements? Articulation? Bony Stops?

Radioulnar Joint Radioulnar Joint

Diarthrodial uniaxial pivot joint

Plane? Axis? Movements? Articulations?

From Seeley RR, Stephens TD, Tate P: Anatomy & physiology, ed 7, New York, 2006, McGraw-Hill; Shier D, Butler J, Lewis R: hole’s human anatomy & physiology, ed 9, New York, 2002, McGraw-Hill.

Objectives Bones, bony landmarks and joint Muscles Movements

Biceps Brachii

Brachialis

Brachioradialis

Triceps Brachii

Anconeus

Pronator Teres

Pronator Quadratus

Supinator

Objectives Bones, bony landmarks and joint Muscles Movements

Movements Flexion:

Movement of forearm to shoulder by bending the elbow to decrease its angle Extension

Extension: Movement of forearm

away from shoulder by straightening the elbow to increase its angle

Movements Pronation

Internal rotary movement of radius on ulna that results in hand moving from palm-up to palm-down position

Supination External rotary movement of

radius on ulna that results in hand moving from palm-down to palm-up position

FLEXION Superior movement of the forearm in the

sagittal plane

FLEXION

FLEXION Biceps brachii Brachialis Brachioradialis Pronator teres

EXTENSION Inferior movement of the foremarm in the

sagittal plane

EXTENSION

EXTENSION Triceps

Long head also extends the shoulder Anconeus

PRONATION Internal rotary movement of the palm to the

down position

Pronator Quadratus

PRONATION

Supinated position

PRONATION Brachioradialis Pronator teres Pronator quadratus

SUPINATION External rotary movement of the palm to the up

position

Supinator

SUPINATION

Supinated position

SUPINATION

Pronated position

SUPINATION Biceps brachii Brachioradialis Supinator