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Preparative steps for synovial fluid analysis. Tlie filter is placed on the holder, synovial fluid is added (a), digestion is performed with sodium hypochlorite (b), water is flushed through the filter, and the filter is dried (c).

Background: Obesity is a risk factor for knee arthritis. Total knee arthroplasty is the definitive surgical treatment of this disease. Therefore, a high percentage of subjects treated are overweight. Since 2000 in the Emilia-Romagna Region the Register of Orthopedic Prosthetic Implantology, RIPO, has recorded data of all the primary and revision operations performed on the knee; height and weight of patients at the time of surgery have also been recorded.