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Elbow: Anatomy

Elbow: Anatomy. Bony Anatomy. Radius Ulna Humerus – 2 condyles Lateral – capitulum Articulates with the radius Medial – trochlea Articulates with humerous. Ligaments. Ulnar collateral Medial epicondyle to ulnar trochlear notch Strong anterior band, weaker transverse & middle

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Elbow: Anatomy

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  1. Elbow: Anatomy

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

  3. Ligaments • Ulnar collateral • 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

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

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

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

  7. Joints • Humeroradial • 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

  8. Nerves • Median • 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

  9. 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

  10. Elbow Anatomy • Carrying angle • 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

  11. Flexion and Extension Pronation and Supination

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