Extensor Carpi Radialis Longus

Lateral (wrist extensor) and supinator Supplied by the radial and the posterior interosseous nerve, this group consists of the supinator, extensor carpi radialis longus, extensor carpi radialis brevis, extensor digitorum communis, and the extensor carpi ulnaris. 

The typical mechanism of injury is a large varus force on an extended supinated forearm, causing the extensor carpi radialis longus and brevis to avulse the lateral condylar physis. This may cause either a partial avulsion, leaving a cartilaginous epiph-... 

The lateral compartment of the elbow includes the extensor muscles of the wrist and hand that arise from the lateral epicondyle as the common extensor tendon , the brachioradialis, the extensor carpi radialis longus and the supinator muscles. 

Because of their free, unconstricted course, the radial and ulnar nerves are rarely compressed in the forearm. A reported site of compression of the sensory branch of the radial nerve is its point of emergence between the tendons of the brachiora-dialis and the extensor carpi radialis longus in the distal forearm. Repeated pronation and supination of the forearm is believed to be contributory to positional impingement of the nerve in the scissoring of these two tendons. From the biomechanical... 

Denman 1979) and leads to considerable tendon weakness, partial and complete tears if untreated. In extensor pollicis longus tenosynovitis, the synovial sheath effusion is typically found just proximal to the Lister tuberde and after the tendon has crossed the extensor carpi radialis longus (Fig. 10.40). Due to the restricted space under the fasda, the synovial sheath of this tendon maybe distended with fluid in the area of the Lister tuberde and over the radial wrist extensors only wflien the amount of effusion is remarkable. 

If the needle is inserted too laterally it will be in the extensor carpi radialis longus. 

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