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Animal tusk slice assays are standard for evaluating the effect of therapeutics on these cells. However, in addition to batch\u2010to\u2010batch variability inherent to animal tusks, their use is clearly not sustainable. Our objective was to develop and characterize a biomimetic calcium phosphate assay based on the use of phase pure hydroxyapatite coated as a thin film on the surface of culture plates, to facilitate the reproducible quantification of osteoclast resorptive activity. Osteoclasts were formed from RAW 264.7 mouse monocyte cell line using a pro\u2010resorptive cytokine RANKL (50 ng\/mL). No change in substrate appearance was noted after culture with media without cells, or undifferentiated monocytes. Only in the presence of osteoclasts localized areas of calcium phosphate dissolution were observed. The total area resorbed positively correlated with the osteoclast numbers (<jats:italic>R<\/jats:italic><jats:sup>2<\/jats:sup> = 0.99). The resorbed area was significantly increased by the addition of RANKL, and decreased after application of known inhibitors of osteoclast resorptive activity, calcitonin (10 \u03bc<jats:italic>M<\/jats:italic>), or alendronate (100 \u03bc<jats:italic>M<\/jats:italic>). Thus, calcium phosphate coated substrates allow reliable monitoring of osteoclast resorptive activity and offer an alternative to animal tusk slice assays. \u00a9 2013 Wiley Periodicals, Inc. 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