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

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Presentation on theme: "Elbow Anatomy and Biomechanics Mimi Renaudin, DPT University of Mississippi Medical Center."— 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 –2 Degrees of freedom  Flexion/Extension and forearm rotation Humerus Radius Ulna

4 Anatomy Overview

5

6 Joint Articulations Humeroulnar Proximal Radioulnar Humeroradial

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

20 Questions


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