Injury to radial nerve in lower part of spiral groove-
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- Spares nerve supply to extensor carpi radialis longus
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- Results in paralysis of anconeus muscle
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- Leaves extensions at elbow joint intact
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- Weakens pronation movement
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EXP:
Radial nerve injury
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High radial nerve palsy- Injury above the spiral groove.
o Paralysis of all muscles supplied by radial nerve.
o Clinical features
§ Wrist drop, finger drop, thumb drop
§ Extension affected of- elbow, wrist, thumb and fingers
§ Sensation affected of- posterior surface of arm and forearm and lower lateral half of forearm.
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Low radial nerve palsy- Injury below the spiral groove.
o Type I- Injury between spiral groove and elbow.
§ Elbow extensors are spared- Triceps and Anconeus.
§ Wrist, thumb and finger extensors paralysed- wrist drop, thumb drop, finger drop.
§ Loss of sensation on dorsal side of first web space.
o Type II- Injury below the elbow joint.
§ Elbow and wrist extensors spared
§ Thumb and finger extensors paralysed.(extensor digitorum, extensor digiti minimi, extensor indicis, extensor pollicis longus, extensor pollicis brevis)- Thumb drop and finger drop.
§ Loss of sensation on dorsal side of first web space.