Long-term outcome of total knee arthroplasty in patients with morbid obesity.

Introduction: Patients with morbid obesity and advanced painful knee osteoarthritis are considered as poor candidates for total knee replacement. Our aims were to evaluate the outcomes of TKR surgery and the risks for post-operative complications in patients with morbid obesity (BMI > 40 kg/m) as compared with obese patients (30 < BMI ≤ 40 kg/m) and non-obese patients, BMI < 30 kg/m); to evaluate if there are differences between morbid-obese patients (BMI 40-49.99 kg/m) and extreme morbid obese patients (BMI > 50 kg/m); and to present some surgical tips which can improve the TKR outcomes in morbid obese patients.