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20160425222454 Ben  
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common condition associated with abnormal flexion of the digits.
caused by disparity between size of tendon and pulleys through which they pass.
simple terms - tendon 'sticks' and cannot pass smoothly through the pulley.

''Associations''  - mostly idiopathic
    women > men
    rheumatoid arthritis
    diabetes mellitus
    ??repetitive use (poor evidence)

''Features''
    > thumb, middle, or ring finger
    initially stiffness and snapping ('trigger') when extending a flexed digit
    nodule may be felt at the base of the affected finger 

''Management''
    steroid injection is successful in majority of patients. A finger splint may be applied afterwards
    surgery  for those not responded to steroid injections