Onggo JR, et al. - A multi-database search was conducted according to PRISMA guideline in this meta-analysis in order to contrast the outcomes, complications, and perioperative parameters of THA in the obese (BMI ≥ 30 kg/m²) vs non-obese (BMI < 30 kg/m²) population and a subgroup analysis of morbidly obese (BMI ≥ 40 kg/m²) compared with non-obese population. A total of 67 studies were involved in this meta-analysis, comprising of 581,012 obese and 1,609,812 non-obese individuals. Obese individuals had a greater risk of all complications, deep infections, superficial infections, dislocations, reoperations, revisions, and readmissions. When subgroup analysis of morbidly obese (BMI ≥ 40 kg/m²) persons was done, the risks of all these parameters were even higher. Thus, after THA, obese and morbidly obese vs non-obese patients were at greater risks of complications. Moreover, in order to decrease these risks where applicable, surgeons should be aware of these risks to advice individuals and adopt prophylactic approaches.