ROSEMONT, Ill., May 11, 2016 /PRNewswire-USNewswire/ -- Septic or infectious arthritis of the knee and Lyme disease
Septic arthritis is considered a medical emergency requiring surgical irrigation (flushing) and drainage to prevent rapid and irreversible destruction of the cartilage surrounding the knee. Lyme disease, an infection common in the northwest and northeast parts of the U.S. and caused by bacteria normally found in deer and transmitted to humans through ticks, is treated with antibiotics. In addition to knee swelling and pain, both conditions may cause a fever, swelling of other joints, irritability and an inability to bear weight on the affected extremity. Common laboratory tests to measure inflammation, as well as white blood cell counts, also may be elevated.
In the new study, researchers reviewed the records of 189 patients under age 18 who presented to Children's Hospital of Philadelphia (CHOP) with excess fluid in the knee between 2005 and 2013. Of these patients, 23 had culture-positive septic arthritis; 26, culture-negative septic arthritis; and 140, Lyme disease.
The study authors found four characteristics that are predictive factors for septic arthritis:
"The probability of septic arthritis with any one factor present was 18 percent compared to 100 percent will all four factors present," said study author Wudbhav N. Sankar, MD, an orthopaedic surgeon at Children's Hospital of Philadelphia. "Our study offers a useful prediction algorithm to help distinguish septic arthritis from a knee effusion caused by Lyme disease in children."
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To view the original version on PR Newswire, visit:http://www.prnewswire.com/news-releases/children-with-swollen-painful-knees-is-it-lyme-disease-or-septic-arthritis-300267071.html
SOURCE American Academy of Orthopaedic Surgeons
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