We noted significantly elevated BMP-7 levels in both lavage fluids (Figure 5(a), P < 0.01, infection 3.2 × 10−8 ± 3.0 × 10−8, control 1.8 × 10−11 ± 4.0 × 10−11) from infected joints and in vitro. The gene discussed is BMP7; the disease is infection.