These authors conducted a retrospective analysis of age-matched patients with a minimum 2-year followup after total shoulder arthroplasty (TSA), reverse total shoulder arthroplasty (RTSA), or hemiarthroplasty. Patients were classified into the following groups: normal (BMI <24.9 kg/m2), overweight (BMI 25-29.9 kg/m2), class I obese (BMI 30-34.9 kg/m2), class II obese (BMI 35-39.9 kg/m2), and class III morbid obese (BMI ≥40 kg/m2).
The authors concluded that no significant difference was found among the 5 BMI groups in arthroplasty type (P = .108) or in complications, including reoperations (P = .27).
The data showed an overall complication rate of 8.6%, a reoperation rate of 4.5%, and a revision rate of 1.2%.
Comment: This study may be statistically underpowered to detect the effect of BMI on adverse outcomes. Note in the table below that all of the infections were in the BMI 35 to 39.9 group and that the largest number of complications and reoperations were also in this group. 8 of the 11 reoperations were in patients with a BMI > 35 kg/m2 .
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