Wrist drop

Def: It is a clinical condition characterised by failure of extension of wrist joint due to paralysis of radial nerve immediate above of elbow joint.

* Beacause radial nerve supply all the extensor muscle of forearm & hand. 


*Cause:
i) Displacement of humerus.
ii) Fall on the arm.
iii) Fracture of the proximal end of humerus.

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