Fig. 9. Incidence of pruritus, femoral nerve block versus PCA. ++= when the study number was designed with two intervention groups and one comparison group, the number of patients in the comparison group was equally divided into two comparison groups. CFNB = continuous femoral nerve block; Epidural = epidural nerve block; FNB = femoral nerve block; p = posterior probability of the treatment effect given the data; PCA = patient-controlled analgesia; Sciatic = sciatic nerve block; SSFNB = single-shot femoral nerve block.