| Summary: | <p class="p p-first-last" id="__p2"><em>Parvimonas micra</em> 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 <em>P. micra</em> 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 <em>P. micra </em>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 <em>P. micra</em> and the second which also reports concomitant pseudogout.</p>
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