CRP and infection: When combining the positive results of any two tests, we found the probability of infection was 100% (except CRP + IL-6 and IL-6 + ESR) but with low probability of occurrence (the rate among infected nonunion patients was CRP + ESR: 25.7%; CRP + WBC: 17.1%; IL-6 + WBC: 20%; WBC + CRP: 11.4%).