Clinical and radiographic outcomes of computer-navigated total knee arthroplasty are not adversely affected by body mass index

Aim: To study the effect of obesity on clinical and radiographic outcomes of computer-navigated knee arthroplasty. Materials and methods: 117 patients underwent primary computer-navigated total knee arthroplasty. Eight were lost to follow-up and 8 had incomplete data. Results: Eighty-four (83.2%) female, 17 (16.8%) male patients age 65.3 +/- 6.9 years with a pre-operative BMI 27.2 +/- 4.1 (18.6-40.0) kg/m(2), 7.3 +/- 0.98 years follow-up. Forty-two (41.6%) had a BMI> 27.5 kg/m(2) indicative of obesity in Singapore. Post-operative radiographic alignment, 2-year Oxford knee scores and ROM were not significantly associated with BMI. Conclusion: BMI is not a determinant of functional scores when computer navigation is used.