AIN HUM:

                Today in OP a peculiar case came which has a incidence of 0.015 to 2 %of population.ITS AINHUM WHICH IS AUTO AMPUTATION OF THE LITTLE TOE BY A CONSTRICTING BAND WHERE THE cause could been due too anomalous posterior tibial artery blood supply.

TREATMENT: 

Incisions across the groove turned out to be ineffective. Excision of the groove followed by z-plasty could relieve pain and prevent autoamputation in Grade I and Grade II lesions. Grade III lesions are treated with disarticulating the metatarsophalangeal joint. This also relieves pain, and all patients have a useful and stable foot. Intralesional injection of corticosteroids is also helpful.

REF: THE WIKI( http://en.wikipedia.org/wiki/Ainhum)