The Power is in Your Hands
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Main Menu The Elbow and Radioulnar Joints click here
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The Power is in Your Hands
Bones Ulna is much larger proximally than radius Radius is much larger distally than ulna Scapula and humerus serve as proximal attachments for muscles that flex & extend the elbow Ulna and radius serve as distal attachments for these same muscles
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The Power is in Your Hands
Bones
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The Power is in Your Hands
Bones Ulna is much larger proximally than radius Radius is much larger distally than ulna Scapula and humerus serve as proximal attachments for muscles that flex & extend the elbow Ulna and radius serve as distal attachments for these same muscles Scapula, humerus, and ulna serve as proximal attachments for muscles that pronate and supinate the radioulnar joints Distal attachments of radioulnar joint muscles are located on radius Bony Landmarks medial condyloid ridge olecranon process coranoid process radial tuberosity Bony Landmarks for Wrist and Hand Muscles medial epicondyle lateral epicondyle lateral supracondylar ridge
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The Power is in Your Hands
Bones
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The Power is in Your Hands
Bones
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The Power is in Your Hands
Joints Ginglymus or hinge-type joint Allows only flexion and extension 2 interrelated joints humeroulnar joint radiohumeral joints
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The Power is in Your Hands
Elbow Motions Primarily involves movement between articular surfaces of humerus and ulna specifically humeral trochlear fitting into ulna trochlear notch radial head has a relatively small amount of contact with capitulum of humerus As elbow reaches full extension, olecranon process is received by olecranon fossa increased joint stability when fully extended As elbow flexes 20 degrees or more, its bony stability is unlocked, allowing for more side-to-side laxity Stability in flexion is more dependent on the lateral (radial collateral ligament) and the medial or (ulnar collateral ligament) Ulnar collateral ligament is critical in providing medial support to prevent elbow from abducting when stressed in physical activity Many contact sports and throwing activities place stress on medial aspect of joint, resulting in injury 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
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The Power is in Your Hands
Joints
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The Power is in Your Hands
Joints
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The Power is in Your Hands
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The Power is in Your Hands
Radioulnar Joint Trochoid or pivot-type joint Radial head rotates around at proximal ulna Distal radius rotates around distal ulna Annular ligament maintains radial head in its joint Joint between shafts of radius and ulna held tightly together between proximal and distal articulations by an interosseus membrane (syndesmosis) substantial rotary motion between the bones
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The Power is in Your Hands
Synergy between Glenohumeral, Elbow, and Radioulnar Joint Muscles As the radioulnar joint goes through its ROM, glenohumeral & elbow muscles contract to stabilize or assist in the effectiveness of movement at the radioulnar joints Ex. when tightening a screw with a screwdriver which involves radioulnar supination, we tend to externally rotate and flex the glenohumeral and elbow joints, respectfully Conversely, when loosening a tight screw with pronation, we tend to internally rotate & extend the elbow & glenohumeral joints, respectfully we depend on both the agonists and antagonists in the surrounding joints to assist in an appropriate amount of stabilization and assistance with the required task
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The Power is in Your Hands
Movement Flexion movement of forearm to shoulder by bending the elbow to decrease its angle Extension movement of forearm away from shoulder by straightening the elbow to increase its angle Pronation internal rotary movement of radius on ulna that results in hand moving from palm-up to palmdown position Supination external rotary movement of radius on ulna that results in hand moving from palm-down to palmup position
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The Power is in Your Hands
Movement
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The Power is in Your Hands
Movement
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The Power is in Your Hands
Movement
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The Power is in Your Hands
Movement
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The Power is in Your Hands
Muscles Anterior Primarily flexion and pronation Biceps brachii Brachialis Brachioradialis Pronator teres Pronator quadratus ___________________________________ Posterior Primarily extension and supination Triceps brachii Anconeus Supinator
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The Power is in Your Hands
Anterior Muscles
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The Power is in Your Hands
Biceps Brachii Muscle Flexion of elbow Supination of forearm Weak flexion of shoulder joint Weak abduction of shoulder joint when externally rotated
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The Power is in Your Hands
Brachialis Muscle True Flexion of muscle
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The Power is in Your Hands
Brachioradialis Muscle Flexion of muscle Pronation from supinated position to neutral Supination from pronated position to neutral
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The Power is in Your Hands
Triceps Brachii Muscle All heads: extension of elbow Long head: extension of shoulder joint; adduction of shoulder joint horizontal abduction
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The Power is in Your Hands
Anconeus Muscle Extension of elbow
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The Power is in Your Hands
Pronator Teres Muscle Pronation of Forearm Weak Flexion of Elbow
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The Power is in Your Hands
Pronator Quadratus Muscle Pronation of Forearm
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The Power is in Your Hands
Supinator Muscle Supination of Forearm
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The Power is in Your Hands
Elbow Flexion Agonists Biceps brachii Brachialis Brachioradialis
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The Power is in Your Hands
Elbow Extension Agonists Triceps Brachii: Anconeus
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The Power is in Your Hands
Radioulnar Pronation Agonists Pronator teres Pronator quadratus Brachioradialis
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The Power is in Your Hands
Radioulnar Supination Agonists Biceps brachii Supinator muscle Brachioradialis
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