TY - JOUR A1 - Tanaka, Akihito A1 - Ito, Yuichi T1 - Septic Arthritis of the Knee Due to Escherichia Coli Secondary to Acute Pyelonephritis Y1 - 2015/4/1 JF - Journal of Integrative Nephrology and Andrology JO - J Integr Nephrol Androl SP - 64 EP - 66 VL - 2 IS - 2 UR - http://www.journal-ina.com/article.asp?issn=2394-2916;year=2015;volume=2;issue=2;spage=64;epage=66;aulast=Tanaka DO - 10.4103/2225-1243.155778 N2 - We report a 67-year-old woman with osteoarthritis (OA) of knees. She also had past histories such as dyslipidemia and hypertension. She was sometimes treated by hyaluronan-injection into the knees for OA at the nearby clinic. She was admitted to our hospital because of acute pyelonephritis in July 2014. We treated her successfully with ceftriaxone first empirically and de-escalated to cefazolin along with the results of urinary and blood cultures. Urinary and blood cultures revealed Escherichia coli. She recovered from pyelonephritis, however, began to complain pain and swelling of the right knee. Culture of the right knee-joint fluid also revealed E. coli. We diagnosed septic arthritis of the right knee and performed arthroscopic lavage, followed by continuous washout with saline for 7 days. She recovered from septic arthritis of the right knee and discharged from our hospital. Although rare, it is important that pyelonephritis-derived sepsis cause septic arthritis of the knee. ER -