Bone biopsies from a group of 16 patients in chronic renal failure treated by intermittent haemodialysis were available for histoquantitative and histochemical assessment before and after the introduction of reverse osmosis treatment of the dialysis fluid. This treatment reduced the aluminium concentration of the fluid from 1.15 mg/l to less than 0.06 mg/l. After the changeover there was an increase in the extent of calcification fronts. Overall, there was a decrease in the histochemical staining reactions for aluminium, although a few cases showed increased reactions. A large percentage of cases showing decreased reactions also had decreased osteoid volumes. It is concluded that reduction of the concentration of aluminium in the dialysis fluid is associated with an improvement in mineralisation state, and this is further evidence of the importance of minimising the aluminium burden of patients with chronic renal failure.
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