Disabling Nmp4 enhances PTH restorative therapy in the distal femur of ovx Nmp4−/− mice. A, Interaction plots of femoral trabecular BV/TV of ovx WT and ovx Nmp4−/− mice as determined by μCT at 4 and 8 weeks of treatment. Data are average ± SD, number of mice/experimental group = 8–9. Statistical differences were determined using a two-way ANOVA, and significance was set at P ≤ .05. The Tukey's honest significant difference post hoc test was used to determine differences between the treatment groups. There were genotype, treatment and genotype × treatment interaction at both time points. There was no difference between the vehicle-treated WT and Nmp4−/− mice. B, μCT images showing PTH-induced improvements in distal femur trabecular architecture in ovx WT and Nmp4−/− mice after 8 weeks of treatment (12-wk postop, 24 wk of age).