Elbow and Radioulnar Joints

Biceps Curl Agonists (3)

1) Biceps brachii 2) Brachialis 3) Brachioradialis

Elbow Flexors (4)

1) Biceps brachii 2) Brachialis 3) Brachioradialis 4) Weak assistance from Pronator teres

Radioulnar Supination Agonsits i.e. tightening a screw (3)

1) Biceps brachii 2) Supinator muscle 3) Brachioradialis

Radioulnar Supinators (3)

1) Biceps brachii 2) Supinator muscle 3) Brachioradialis

Radioulnar Pronations Agonists (3)

1) Pronator teres 2) Pronator quadratus 3) Brachioradialis

Radioulnar pronators (3)

1) Pronator teres 2) Pronator quadratus 3) Brachioradialis

Push up Agonists (2)

1) Triceps brachii 2) Anconeus

Elbow Extensors (2)

1) Triceps brachii 2) Anconeus provides assistance

Elbow Joint has ___ _____________ joints.

2, interrelated humeroulnar joint radiohumeral joint

T/F: radial head has a relatively large amount of contact with capitulum of humerus.

False: small

Somewhat less common problem

Medial epicondylitis or golfer's elbow

Ginglymus or hinge-type joint allows for ______ __________ and ___________.

ONLY, flexion, extension

Posterior muscles, primarily __________ and ___________. (3)

extension, supination 1) Triceps brachii 2) Anconeus 3) Supinator

Supination

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

Pronation

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

Stability for the radioulnar joint is provided by an ___________ __________ (_________________).

interosseus, membrane, syndesmosis

Stability during flexion is provided by ___________.

ligaments

Extension

movement of forearm away from shoulder by straightening the elbow to increase its angle

Flexion

movement of forearm to shoulder by bending the elbow to decrease its angle

__________ between glenohumeral, elbow, & radioulnar joint muscles: As the radioulnar joint goes through its ______, glenohumeral & ______ muscles contract to ________ or assist in the effectiveness of movement at the radioulnar joints

Synergy, ROM, elbow, stabilize ex. when tightening a screw with a screwdriver which involves radioulnar supination, we tend to externally rotate & flex the glenohumeral & elbow joints, respectfully

Both common problems involve muscles which ______ the elbow but act primarily on the _______ and ______.

cross, wrist, hand

The _____ head rotates around the ______ both distally and proximally.

radial, ulna

When the elbow moves, the humeral __________ fits into the _____'s trochlear notch.

trochlea, ulna

Radioulnar joint classification

trochoid or pivot-type joint

Elbow Joint Classification

Ginglymus or hinge-type joint

Common problem

Tennis elbow or lateral epicondylitis - associated with gripping and lifting activities - involves extensor digitorum

T/F: As elbow reaches full extension, olecranon process is received by olecranon fossa, this increases joint stability when fully extended.

True

T/F: Elbow joint movements may be clearly distinguished from those of the radioulnar joints. Radioulnar joint movements may be distinguished from those of the wrist.

True

T/F: Elbow motions primarily involve movement between articular surfaces of humerus & ulna.

True

T/F: Most upper extremity movements involve the elbow & radioulnar joints.

True

Anterior muscles, primarily ______ and ________. (5)

flexion, pronation, 1) Biceps brachii 2) Brachialis 3) Brachioradialis 4) Pronator teres 5) Pronator quadratus