DIAG 2730 Elbow - Elbow The primary function of the elbow...

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Elbow The primary function of the elbow complex is to work together with the shoulder to position the hand for functional activities The elbow complex is a strong, stable compound joint. The stability of the elbow complex, gives very little, making it prone to overuse injuries
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Biomechanics Biomechanically, the elbow predominantly functions as a link in the upper extremity kinetic chain, allowing the generation and transfer/dispersement of forces which occur in the upper extremity.
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Elbow The elbow complex is comprised of three distinct articulations: The humeroulnar joint The humeroradial joint The proximal radioulnar joint
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Geometric Alignment When the elbow is extended the points at the olecranon and the medial & lateral epicondyles lie in a straight line When the elbow is flexed the olecranon and the medial & lateral epicondyles form an isosceles triangle What if it is not ?
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Monteggia Fracture A fracture of the ulna near the junction of its proximal and middle thirds associated with a dislocation of the radial head. These fractures are often classified by the direction of radial head dislocation.
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Monteggia Fracture Type 1: The radial head is dislocated anteriorly, with palmar angulation of the fractured shaft of the ulna. Occurs 60% of the time.
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Humeroulnar Joint A uniaxial hinge joint between the trochlear notch of the proximal ulna and the butterfly shaped trochlea of the humerus The angulation of this joint forms the “carrying angle” – caused by the ________ The carrying angle is approximately 11-14 ° in males and 13-16 ° in females
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Humeroulnar Joint The carrying angle is approximately 11-14 ° in males and 13-16 ° in females The resting, or open pack position for the humeroulnar joint = 70 ° of flexion with 10 ° of forearm supination The closed pack position = full extension and maximum forearm supination
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Cubital Valgus Increased angulation can be caused by epiphyseal damage – MOI = lateral epicondylar fracture Fractures of the lateral condyle represent 15-17% of pediatric elbow fractures
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Lateral Epicondylar Fracture Most fractures occur in patients with a peak age 5-7 years. The most common MOI occurs when a varus force is applied to the elbow, causing the extensor muscles and lateral collateral ligaments to avulse the lateral condyle.
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Cubital Varus Decrease in carrying angle = cubital varus aka gunstock deformity MOI = trauma ie: supracondylar fracture In children, the most common elbow fractures are supracondylar (60%), lateral condylar (15%), and medial epicondylar (10%) (Rogers, 1978).
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Cubital Varus The majority of supracondylar fractures are extension injuries and are due to a fall on an outstretched arm (FOOSH), with the proximal ulna transmitting force to the distal humerus. Cubitus varus is due primarily to
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This note was uploaded on 11/23/2011 for the course DIAG 2730 taught by Professor Ronaldg.mayne during the Winter '11 term at Life Chiropractic College West.

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DIAG 2730 Elbow - Elbow The primary function of the elbow...

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