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The aim of this study was to compare the sensitivity and specificity of the two histochemical stains most commonly used as indirect markers of the aluminium bone content. The clinical study was made in 28 biopsies from patients undergoing haemodialysis and the experimental study in 17 tibias from Wistar rats aluminium overloaded and with different deposits of iron. All samples were stained with aluminon, solochrome azurine and Perls and aluminium bone content was also measured. When the positive cases with Perls were excluded in the clinical study (without iron interference), the trabecular surface stained with solochrome azurine correlated with the aluminium bone content (r = 0.71, P &lt; 0.001). With aluminon, on the other hand, no correlation was found. Solochrome azurine was always positive with aluminium contents greater than 8 micrograms/g. Aluminon was positive over 17 micrograms/g. In the experimental study, the iron concentration, in addition to other parameters, was also measured. As in the clinical study, the trabecular surface stained with solochrome azurine correlated with the aluminium content. If the positive Perls cases were excluded, the trabecular surface stained with solochrome azurine doubled the trabecular surface stained with aluminon (P &lt; 0.001). No intratrabecular aluminon staining was observed while the intratrabecular solochrome staining correlated with the aluminium content (P &lt; 0.001). Solochrome azurine was more sensitive than the aluminon and its lack of specificity can be easily corrected by employing Perls staining to exclude the iron interference.

Staining of bone aluminium: comparison between aluminon and solocbrome azurine and their correlation with bone aluminium content