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Elbow
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Elbow

3 articulations

  1. Radial head - Humeral capitellum: Pronation and supination
  2. Ulnar olecranon - Humeral trochlea: hinge joint
  3. Proximal radio-ulnar joint: radial head rotates within radial (sigmoid) notch of the ulna --> pronation, supination


MRI

Osseous disorders


Osteochondral lesion OCL

Capitellum of the dominant arm in throwers. 12-16 years old, part or whole capitellum, loose bodies possible. Unstable lesion if high signal T2 encircles OCL. The overlying cartilage is intact in stable lesion.


Panner's disease (Osteochondrosis)

Whole capitellum, 5-10 years old, no loose bodies.


Ligaments Anatomy


Radial Collateral Ligament Complex

provides Varus stability. Consists of

  1. Radial Collateral Ligament Proper: from the lateral epicondyle to the annular ligament
  2. Annular ligament: attaches to the anterior and posterior margins of radial notch of the ulna
  3. Accessory collateral ligament
  4. Lateral Ulnar Collateral Ligament LUCL: primary restraint to varus. From the lateral epicondyle to the ulna.
* Lateral epicondylitis: Tennis elbow or radial tunnel syndrome (5%) * Medial epicondylitis: Golf elbow or ulnar nerve entrapment (20%) Tennis elbow: pain and tenderness at the site of origin of extensor carpi radialis brevis muscle = lateral epicondyle of humerus. 35-50 yo, pain wit wrist extension, lifting, Golf elbow: pain and tenderness at the site of origin of flexor/pronator muscles = medial epicondyle