Rapid preparation of fresh-frozen undecalcified bone for histological and histochemical analysis.

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Abstract
An increasing need to be able to relate hard tissue morphology to its histochemistry, and the lack of an adequate methodology, prompted this investigation of polyvinylpyrrolidones of varying chain length as supporting films for the cryomicrotomy of fresh undecalcified cortical and trabecular bone. We developed a method that parallels histological procedures but is biochemically inert and functions at -25 degrees C. Using an LKB heavy-duty cryomicrotome, large numbers of serial sections suitable for histochemistry, immunocytochemistry, or rapid histology can be prepared with ease. Sections from mouse skull, ox vertebra, and human iliac crest illustrate the versatility of the method, and have been examined for the preservation of general morphology and of histochemical activity of those enzymes most prominent in remodeling. The procedure does not preclude the subsequent application of standard hard-tissue embedding methods to the remaining material. Comparison with plastic-embedded bone shows not only close similarities in the structural preservation of the frozen tissue, making possible histomorphometry, but also shows some interesting staining differences. These include the absence of differentiation of the calcification front with toluidine blue stain in fresh frozen specimens, and the presence in frozen osteoid tissue of specific methylene blue metachromasia missing from plastic preparations.