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Elbow Anatomy and Biomechanics

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Presentation on theme: "Elbow Anatomy and Biomechanics"— Presentation transcript:

1 Elbow Anatomy and Biomechanics
Mimi Renaudin, DPT University of Mississippi Medical Center

2 Objectives Describe the anatomy and joint articulations at the elbow
Discuss the static and dynamic constraints acting at the elbow Identify the neurovascular contributions within the elbow joint

3 Elbow Snap Shot Trochoginglymoid joint Humerus Radius Ulna
2 Degrees of freedom Flexion/Extension and forearm rotation Humerus Radius Ulna

4 Anatomy Overview


6 Joint Articulations Humeroradial Humeroulnar Proximal Radioulnar

7 Anterior Muscular Component
9 muscles cross the anterior aspect of the joint Only 3 have primary action on the elbow Radioulnar joint - rotation Remaining 4 muscles arise from common flexor tendon on medial epicondyle

8 Elbow Flexors

9 Radioulnar Motion Supinator, pronator teres with assistance from pronator quadratus distally

10 Anterior Musculature Final 4 muscles attach on medial epicondyle
Primary actions occur at the wrist and digits PL FCR FCU FDS

11 Posterior Muscular Component
Elbow extensors: triceps, anconeus Triceps: 3 heads Long: crosses GH and elbow Medial/Lateral: only cross elbow Anconeus Common extensor tendon

12 Elbow Extensors

13 Lateral Epicondyle Attachments
Extensor carpi radialis longus Extensor carpi radialis brevis Extensor digitorum Extensor carpi ulnaris Extensor digiti minimi

14 Capsuloligamentous Complex
Medial collateral ligament Lateral collateral ligament

15 Medial Collateral Ligament
Resists valgus stress Limits extension Taut throughout arch of motion Anterior fibers most taut in extension Posterior bundle is taut in flexion Transverse fibers provide valgus stability and help with joint approximation

16 Vascular Contribution

17 Normal Elbow Motion Normal ROM: Functional ROM: Elbow 0-145°
Pronation: 80° Supination: 85° Functional ROM: Elbow ° Pronation: 50° Supination: 50°

18 Carrying Angle Formed by valgus tilt of the axis of rotation (humeral articulation) and the valgus orientation of the ulnar shaft in reference to the olecranon

19 References DeLee, Drez. DeLee and Drez’s Orthopaedic Sports Medicine. 3rd ed 2. Levangie PK, Norkin CC. Joint Structure & Function. 4th ed 3. Moore KL, Dalley AF, Agur AM. Clinically Oriented Anatomy. 6th ed

20 Questions

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