M132-5

Hip aspirate: Propionibacterium acnes    – Shipped August 2013

HISTORY

The challenge was sent to category A laboratories. The sample was a simulated hip aspirate fluid obtained from a 63 year old female with left hip revision arthroplasty.

Participants were expected to isolate and identify Propionibacterium acnes and to perform antimicrobial susceptibility or refer for testing.

MAIN EDUCATIONAL POINTS from M132-5

  1. The major educational points of this challenge were to make laboratories aware that Propionibacterium acnes is an important pathogen that may arise during revision arthroplasty. The organism grows slowly and may be missed if cultures are not collected appropriately and incubated only for short periods of time.
  2. Swabs from incision sites are not appropriate for this type of investigation. The source was an aspirate from the hip revision site.

Full critique (PDF)

Posted in Clinical Bacteriology Results, critiques