IL18 and osteonecrosis: We do not observe the existence of substantial genetic correlations (rg = 0.073 and P = .840 between CDCP1 and osteonecrosis; rg = -0.295 and P = .453 between CSF1 and osteonecrosis; rg = -0.054 and P = .832 between MCP-4 and osteonecrosis; rg = -0.116 and P = .740 between IL-10RB and osteonecrosis; and rg = 0.188 and P = .648 between osteonecrosis and IL-18).