title: Importance of selection and duration of antibiotic regimen in prosthetic joint infections treated with debridement and implant retention.
abstract: OBJECTIVE
  Early prosthetic joint infections (PJIs) are managed with debridement, implant retention and antibiotics (DAIR). Our aim was to evaluate risk factors for failure after stopping antibiotic treatment.
  
  
  METHODS
  From 1999 to 2013, early PJIs managed with DAIR were prospectively collected and retrospectively reviewed. The main variables potentially associated with outcome were gathered, and the minimum follow-up was 2 years. For the present study, only patients who were in remission after one debridement and without long-term antibiotic suppression were included. The primary endpoint was implant removal or the need to reintroduce antibiotic treatment due to failure.
  
  
  RESULTS
  One-hundred-and-forty-three patients met the inclusion criteria. The failure rate after a median duration of oral antibiotic treatment of 69 days (IQR 45-95 days) was 11.8%. In 92 cases, PJI was due to Gram-positive microorganisms, in 21 cases PJI was due to Gram-negative microorganisms and in 30 cases PJI was due to a polymicrobial infection with both Gram-positive and Gram-negative microorganisms. In Gram-positive infections, rifampicin administered in combination with linezolid, co-trimoxazole or clindamycin was associated with a higher failure rate (27.8%, P = 0.026) than that in patients receiving a combination of rifampicin with levofloxacin, ciprofloxacin or amoxicillin (8.3%) or monotherapy with linezolid or co-trimoxazole (0%). Among patients with a Gram-negative infection, the use of fluoroquinolones was associated with a lower failure rate (7.1% versus 37.5%, P = 0.044).
  
  
  CONCLUSIONS
  The only factor associated with failure was the oral antibiotic selection, not the duration of treatment. Linezolid, co-trimoxazole and clindamycin, but not levofloxacin, serum concentrations are reduced by rifampicin; a fact that could explain our findings. Further studies monitoring serum concentration could help to improve the efficacy of these antibiotics when administered in combination with rifampicin.
authors.affiliation: Department of Traumatology and Orthopaedic Surgery, Hospital Clinic of Barcelona, Barcelona, Spain etornero@clinic.ub.es.
authors.forename: Eduard
authors.initials: E
authors.lastname: Tornero
authors.affiliation: Service of Infectious Diseases, Hospital Clinic of Barcelona, University of Barcelona, IDIBAPS, Barcelona, Spain.
authors.forename: Laura
authors.initials: L
authors.lastname: Morata
authors.affiliation: Department of Traumatology and Orthopaedic Surgery, Hospital Clinic of Barcelona, Barcelona, Spain.
authors.forename: Juan C
authors.initials: JC
authors.lastname: Martínez-Pastor
authors.affiliation: Department of Traumatology and Orthopaedic Surgery, Hospital Clinic of Barcelona, Barcelona, Spain.
authors.forename: Silvia
authors.initials: S
authors.lastname: Angulo
authors.affiliation: Department of Traumatology and Orthopaedic Surgery, Hospital Clinic of Barcelona, Barcelona, Spain.
authors.forename: Andreu
authors.initials: A
authors.lastname: Combalia
authors.affiliation: Department of Traumatology and Orthopaedic Surgery, Hospital Clinic of Barcelona, Barcelona, Spain.
authors.forename: Guillem
authors.initials: G
authors.lastname: Bori
authors.affiliation: Department of Traumatology and Orthopaedic Surgery, Hospital Clinic of Barcelona, Barcelona, Spain.
authors.forename: Sebastián
authors.initials: S
authors.lastname: García-Ramiro
authors.affiliation: Service of Microbiology, Hospital Clinic of Barcelona, University of Barcelona, ISGlobal, Barcelona, Spain.
authors.forename: Jordi
authors.initials: J
authors.lastname: Bosch
authors.affiliation: Service of Infectious Diseases, Hospital Clinic of Barcelona, University of Barcelona, IDIBAPS, Barcelona, Spain.
authors.forename: Josep
authors.initials: J
authors.lastname: Mensa
authors.affiliation: Service of Infectious Diseases, Hospital Clinic of Barcelona, University of Barcelona, IDIBAPS, Barcelona, Spain.
authors.forename: Alex
authors.initials: A
authors.lastname: Soriano
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000900:Anti-Bacterial Agents / Q000627:therapeutic use*; D003646:Debridement; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010003:Osteoarthritis / Q000188:drug therapy* / Q000601:surgery*; D016459:Prosthesis-Related Infections / Q000188:drug therapy* / Q000601:surgery*; D012189:Retrospective Studies; D016896:Treatment Outcome
chemical_list: D000900:Anti-Bacterial Agents