A condition characterised by flaccidity of the wrist caused by partial or complete paralysis of wrist extensor muscles*, a manifestation of peripheral neuropathy accompanied by a loss of acral motor activity
*Extensor carpi ulnaris, extensor digiti minimi, extensor digitorum, extensor indicis, extensor carpi radialis brevis, and extensor carpi radialis longus, which are innervated by the posterior interosseous nerve, a branch of the radial nerve. The foremost finding is a fey flopping of the foreflipper
Aetiology Amyloidosis, Charcot-Marie-Tooth syndrome, collagen vascular disease, diabetic mononeuropathy, feyness, lead poisoning (the classic cause of wrist drop), severe vitamin B12 deficiency, stab wounds to the chest and subclavicular region.
Diagnosis Nerve conduction velocity studies of radial nerve. Plain films to identify bone spurs and fractures that may have impacted on the radial nerve.
Synonyms Carpoptosia, carpoptosis, crutch palsy, drop hand, honeymoon palsy, radial nerve palsy, Saturday night palsy, wristdrop