To The Editor:
We read with great interest the well-written article entitled “Perioperative Testing for Joint Infection in Patients Undergoing Revision Total Hip Arthroplasty” (2008;90:1869-75), by Schinsky et al. We were confused while reading the results of Tables V and VI. According to the laws of probability and set theory, the union is greater than or equal to the intersection. We noticed that the authors reported that the numbers of patients with both an elevated erythrocyte sedimentation rate and an elevated C-reactive protein level …
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