J Bone Jt Infect 2016; 1:65-67. doi:10.7150/jbji.16124

Short Research Communication

Acute Mono-Arthritis of the Knee: A Case Report of Infection with Parvimonas Micra and Concomitant Pseudogout

Martijn Dietvorst1✉, Ramon Roerdink2, Alexander C.A.P. Leenders2, Menno A. Kiel3, L. Paul A. Bom2

1. Maastricht University, Maastricht, The Netherlands;
2. Jeroen Bosch general hospital, 's-Hertogenbosch, The Netherlands;
3. Erasmus Medical Centre, Rotterdam, The Netherlands.

Abstract

Parvimonas micra is a rare pathogen for septic arthritis and is known for its subacute onset. We report a case of acute arthritis of the knee caused by P. micra and pseudogout. Initially, calcium pyrophosphate crystals were found in the knee, which were successfully treated with a steroid injection. Only anaerobic cultures became positive. A 16S rRNA PCR-analysis was necessary to identify P. micra as causative agent, a method which is never described before in similar cases. The infection was treated with clindamycin for 6 weeks. This is the third case report of a septic arthritis caused by P. micra and the second which also reports concomitant pseudogout.

Keywords: septic arthritis, knee, acute mono-arthritis, Parvimonas micra, pseudogout, CPPD.

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How to cite this article:
Dietvorst M, Roerdink R, Leenders ACAP, Kiel MA, Bom LPA. Acute Mono-Arthritis of the Knee: A Case Report of Infection with Parvimonas Micra and Concomitant Pseudogout. J Bone Jt Infect 2016; 1:65-67. doi:10.7150/jbji.16124. Available from http://www.jbji.net/v01p0065.htm