Burn E, et al. - From routinely collected data of 10,260 and 10,961 individuals from total knee replacement (TKR) and total hip replacement (THR) cohorts respectively from 1997 to 2014, the researchers intended to examine the association of body mass index (BMI) and smoking with risk of revision following TKR and THR. The 10-year risk of revision was assumed to change from 4.6% to 3.7% for TKR and 3.7% to 4.0% for THR for an otherwise average patient profile, for a change in BMI from 25 to 35. Further, varying from a non-smoker to a current smoker was presumed to change the risk of revision from 4.1% to 2.8% for TKR and from 3.8% to 2.9% for THR for an otherwise average patient profile. For different values of BMI or smoking status, estimations of lifetime risk were also similar. Hence, a meaningful impact of obesity and smoking on the risk of revision following TKR and THR was not observed.