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[On the effect of methane-bis--phosphonate in vivo (author's transl)].

After s.c. injections of methane-bis-phosphonate into rabbits, calcified incrustations developed around the injection sites. These incrustations were less radiolucent than the surrounding tissues. They appeared to have a good crystalline apatite structure in X-ray diffraction. The findings agree with our previous in vitro studies but disagree with the findings in the literature that ethane-1-hydroxy-1,1-diphosphonate (EHDP) and dichloromethyle-nediphosphonate (Cl2MDP) inhibit crystal growth of apatite already formed.