Reveal the rate of surgical site infection (SSI) after primary hip and knee arthroplasty in patients with inflammatory joint disease and analyse if the infection rate was correlated to the given anti-rheumatic treatment. The background is that since 2006 patients operated at the orthopaedic department at Skåne University hospital, Lund, Sweden, have continued treatment with TNF-alpha inhibitors during the perioperative period. During 2006 to 2015 494 planned primary hip and knee arthroplasties were performed on 395 patients (236 hip arthroplasties and 239 knee arthroplasties). Data on age, sex, diagnosis, BMI, operation time, ASA-classification, treatment with cDMARDs (conventional disease modifying anti-rheumatic drugs) and bDMARDs (biological disease modifying antirheumatic drugs) and use of prednisolone was collected. The primary outcome variable was prosthetic joint infection (PJI) within 1 year from surgery with a secondary outcome variable being superficial SSI.Aim
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