Histologic, physical and chemical analyses of the excised bony mass from a case of myositis ossificans traumatica were carried out. X-ray diffraction showed that the newly formed bone was an intermediate fluorhydroxylapatite. Infrared spectroscopy and chemical analysis supported this finding. Contrary to articular free bodies the mineral part of the bony mass from the myositis ossificans investigated was formed most probably in a basic environment.

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In 130 growing chinchilla rabbits, the effect of various diaphyseal injuriesperiosteal stripping, cortical drilling and fractureon the growth plate and the metaphysis of the tibia was studied histologically and radiographically and with the aid of "Cr labelled erythrocytes and the W r isotope. It was found that the disturbed circulation and the venous stasis may have a marked effect on osteogenesis and bone growth but other factors are probably also involved. In the early stage after the injury an increase in the ground substance, widening of the zone of germinative and proliferative cells in the growth plate and a reticular arrangement of the bony trabeculae in the metaphysis were observed. In the late stage, along with a return to normal circulation, normalization of the osteogenesis and bone growth was also found.

Physical and chemical analysis of the newly formed calcified bodies in articular osteochondromatosis was carried out. X-ray diffraction showed that these bodies consisted of carbonate apatite from the group FrancoliteDahllite. Infrared spectroscopy, and chemical and differential thermal investigations supported the data gained from the X-ray diffraction analysis.

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