COMPARATIVE STUDY
JOURNAL ARTICLE

Microbiologic diagnosis of prosthetic shoulder infection by use of implant sonication

Kerryl E Piper, Melissa J Jacobson, Robert H Cofield, John W Sperling, Joaquin Sanchez-Sotelo, Douglas R Osmon, Andrew McDowell, Sheila Patrick, James M Steckelberg, Jayawant N Mandrekar, Marta Fernandez Sampedro, Robin Patel
Journal of Clinical Microbiology 2009, 47 (6): 1878-84
19261785
We recently described a sonication technique for the diagnosis of prosthetic knee and hip infections. We compared periprosthetic tissue culture to implant sonication followed by sonicate fluid culture for the diagnosis of prosthetic shoulder infection. One hundred thirty-six patients undergoing arthroplasty revision or resection were studied; 33 had definite prosthetic shoulder infections and 2 had probable prosthetic shoulder infections. Sonicate fluid culture was more sensitive than periprosthetic tissue culture for the detection of definite prosthetic shoulder infection (66.7 and 54.5%, respectively; P = 0.046). The specificities were similar (98.0% and 95.1%, respectively; P = 0.26). Propionibacterium acnes was the commonest species detected among culture-positive definite prosthetic shoulder infection cases by periprosthetic tissue culture (38.9%) and sonicate fluid culture (40.9%). All subjects from whom P. acnes was isolated from sonicate fluid were male. We conclude that sonicate fluid culture is useful for the diagnosis of prosthetic shoulder infection.

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