Effect of body mass index on short- and medium-term effectiveness of unicompartmental knee arthroplasty

To investigate the effect of body mass index (BMI) on the short- and medium-term effectiveness of unicompartmental knee arthroplasty (UKA) in the treatment of anterior medial compartmental osteoarthritis of knee joint. The clinical data of 55 patients (61 knees) with anterior medial compartmental osteoarthritis of knee joint treated with minimally invasive UKA between May 2014 and May 2019 were retrospectively analyzed. According to BMI, the patients were divided into 3 groups: normal body mass group [group A, BMI 18.50-24.99 kg/m , 23 cases (25 knees)], overweight group [group B, BMI 25.00-29.99 kg/m , 23 cases (25 knees)], obesity group [group C, BMI 30.00-39.99 kg/m , 9 cases (11 knees)]. There was no significant difference in gender, age, sides, disease duration, and preoperative American Special Surgery Hospital (HSS) score, pain visual analogue scale (VAS) score, and knee range of motion (ROM) among 3 groups ( >0.05). The operation time, intraoperative dominant blood loss, and the postoperative decrease