[Hand arthropathy of professional origin: milkingman hand]

The aim of this case-control study was to know possible correlates between distinctive pattern of hand arthrosis and length manual milking.

Between January 1990 and January 1996, we retrospectively reviewed the patients with symptomatic arthrosis in whose hands was identified this pattern: degenerative disease of distal interphalangeal joints with radial deviation and flexion of distal phalanges in association to arthrosis involving metacarpophalangeal and interphalangeal joints of the thumb. The first 88 cases of hand arthrosis without this clinical and radiographic pattern make the control group. Patients suffering inflammatory rheumatic diseases were excluded.

35 patients with this special pattern of hand arthrosis were recruited. The majority of patients were women (94.3%) and coming from rural environment (94.3%). 32 patients had performed daily manual milking over a period of 20 years, but in three patients the pattern was not related to this activity (odds ratio = 928: p < 0.001). Symptoms were more frequent in the control-group (57% versus 26%; p < 0.04), in which no characteristic pattern of alignment abnormality was found.

A typical pattern of hand arthrosis was associated with prolonged manual milking: degenerative disease of metacarpophalangeal and interphalangeal joints of thumb, radial deviation associated with flexion of distal phalanges of second at fourth fingers and arthrosis involving their distal interphalangeal joints, often linked to sight ulnar deviation of middle phalanges.