Elbow: Anatomy

Bony Anatomy Radius Ulna Humerus – 2 condyles Lateral – capitulum Articulates with the radius Medial – trochlea Articulates with humerous

Ligaments Ulnar collateral Radial collateral Annular Medial epicondyle to ulnar trochlear notch Strong anterior band, weaker transverse & middle Gives medial support Radial collateral Lateral epicondyle to side of annular ligament Does not attach to radius Gives lateral support Annular Holds radius to ulna and humerus Allows rotation of radius (supination and flexion) Gives lateral support

Muscles Flexion Extension Pronation Supination Biceps brachii, brachial, brachioradialis Extension Triceps brachii Pronation Pronator quadratus, pronator teres Supination Biceps brachii, supinator muscle

Muscles Biceps brachii Brachialis Brachioradialis Triceps brachii Insertion Tuberosity of the radius Movement Flexes elbow, supinates forearm Brachialis Coronoid process of ulna Flexes elbow Brachioradialis Insertion Styloid process of the raidus Movement Flexes elbow Triceps brachii Olecranon process of ulna Extension

Muscles Supinator Pronator teres Anconeus Insertion Movement Insertion Proximal end of the lateral surface of the shaft of the radius Movement Supinates the elbow Pronator teres Middle of the lateral surface of the shaft of the radius Pronates elbow Anconeus Insertion Lateral surface of the olecranon process of the ulna Movement Extends elbow

Joints Humeroradial Radioulnar Humeroulnar Articulation of lateral distal humerus and proximal radius Radioulnar Articulation between radial notich of the proximal lateral aspect of ulna, the radial head and capitulum of distal humerus Important in supination andpronation Humeroulnar Articulation between distal humerus medially and proximal ulna

Nerves Median Radial Ulnar Musclocutaneous Passes deep in the cubital fossa medial to the biceps and brachialis Radial Lateral to biceps and brachialis Ulnar Courses posteriorly in groove between the medial epicondyle and olecranon process Musclocutaneous Passes through cubital fossa, supplies the anterior forearm and thenar muscles

Elbow Anatomy MISC Medial & lat. Condyles with the olecranon process form a straight line when arm is straight Forms a triangle when arm is bent Posterolateral triangle – radial head, lat. Condyle, olecronon process Good place for aspiration

Elbow Anatomy Carrying angle ROM 5-15 degrees female 5-10 degrees male This angle will increase in athletes that have participated in throwing sports for a long time, or the angle could increase if there is a fx ROM Flexion – 145 degrees Extension – 0 / -5 degrees Pronation & supination – 90 degrees

Pronation and Supination Flexion and Extension Pronation and Supination