title: [Infectious osteoarthritis due to Propionibacterium acnes. Two new cases].
abstract: BACKGROUND
  Propionibacterium acnes is an anaerobic germ, usually found as a saprophyte of the skin and the mucosa. It may be responsible for iatrogenic or spontaneous osteoarhritis.
  
  
  METHODS
  We report two new cases of septic arthritis induced by P. acnes: a case of iatrogenic spondylodiscitis and a case of spontaneous septic arthritis of the lumbar facet joints. The two patients were immunocompetent, without acne.
  
  
  CONCLUSIONS
  Except for patients with criteria of the SAPHO syndrome (synovitis-acne-pustulosis-hyperostosis-osteomyelitis), osteoarthritis caused by P. acnes is increasingly described. The number of these infections is probably underestimated because of the technical problems involved in isolating P. acnes in the laboratory.
authors.affiliation: Service de rhumatologie, hôpital Jean-Minjoz, CHU, Besançon, France.
authors.forename: L
authors.initials: L
authors.lastname: Hustache-Mathieu
authors.forename: A
authors.initials: A
authors.lastname: Brousse
authors.forename: A
authors.initials: A
authors.lastname: Lohse
authors.forename: F
authors.initials: F
authors.lastname: Michel
authors.forename: E
authors.initials: E
authors.lastname: Toussirot
authors.forename: J L
authors.initials: JL
authors.lastname: Dupond
authors.forename: D
authors.initials: D
authors.lastname: Wendling
mesh_terms: D020083:Acquired Hyperostosis Syndrome; D000328:Adult; D001170:Arthritis, Infectious / Q000382:microbiology* / Q000473:pathology; D005260:Female; D016908:Gram-Positive Bacterial Infections; D006801:Humans; D008297:Male; D008875:Middle Aged; D010003:Osteoarthritis / Q000382:microbiology* / Q000473:pathology; D011425:Propionibacterium acnes