Joints I Please enable JavaScript in your browser to complete this form.Please enable JavaScript in your browser to complete this form.Question 1)Figures 1A and B are the radiographs of a patient who underwent a total knee arthroplasty (TKA) 1 year ago and now has persistent pain. What is the most appropriate next step? Arthroplasty Question 1) Figure A & B Select the Correct AnswerBone scanObservationCT scanRevision knee arthroplastyComplete blood count (CBC), erythrocyte sedimentation rate (ESR), and C-reactive protein (CRP)Correct Answer: Complete blood count (CBC), erythrocyte sedimentation rate (ESR), and C-reactive protein (CRP) Explanation: Following TKA, bone scan findings may remain positive in 20% of patients at 1 year and 12% at 2 years, introducing potential for false-positive results. The first step in evaluation of a painful TJA is to obtain infectious laboratory studies that include an ESR, CRP, and CBC. Infection is a leading contributor to early failure following TKA. References: Source 2015 AAOS OITE Parvizi J, Ghanem E, Sharkey P, Aggarwal A, Burnett RS, Barrack RL. Diagnosis of infected total knee: findings of a multicenter database. Clin Orthop Relat Res. 2008 Nov;466(11):2628-33. doi: 10.1007/s11999-008-0471-5. Epub 2008 Sep 10. PMID: 18781372; PMCID: PMC2565043. Rosenthall L, Lepanto L, Raymond F. Radiophosphate uptake in asymptomatic knee arthroplasty. J Nucl Med. 1987 Oct;28(10):1546-9. PubMed PMID: 3655908. Wrong Answer: Please try again! Submit Post navigation Previous QuestionSports INext QuestionSports III
