Katakam A, Collins AK, Sauder N, et al. - This study was intended to determine if elevating body mass index (BMI) is a risk factor for failure to attain the 1-year Patient-Reported Outcomes Measurement Information System Physical Function (PROMIS PF-10a) minimal clinically important difference (MCID) following total joint arthroplasty (TJA) and to ascertain a possible BMI threshold beyond which this risk increases significantly. Researchers conducted a retrospective study applying 3,506 TJAs sourced from a regional-based registry. They assessed the relationship between BMI and failure to achieve 1-year PROMIS PF-10 MCID applying logistic regression. The receiver operating characteristic curve analysis was performed to ascertain a BMI threshold. The results displayed that elevating BMI is a risk factor for failure to achieve the 1-year PROMIS PF-10a MCID following TJA. An increase in 1 kg/m 2 increased the risk of failure to achieve the MCID by 2% among the patients. The results recognized that surgeons will be better equipped to preoperatively advise individuals with increased BMIs considering TJA.