The DAIR (debridement, antibiotics and implant retention) procedure for infected total knee replacement – a literature review
Orthopaedic Resident, Leicester Orthopaedics, University Hospitals of Leicester, Leicester
LE1 5WW, UK
2 Consultant Microbiologist, University Hospitals of Leicester, Leicester LE1 5WW, UK
3 Consultant Orthopaedic and Sarcoma Surgeon, Leicester Orthopaedics, University Hospitals of Leicester, Leicester LE1 5WW, UK
* Corresponding author: email@example.com
Accepted: 8 November 2016
Prosthetic joint infection (PJI) is a devastating complication in total knee arthroplasty (TKA) and third most common cause of revision of TKA with significant morbidity and surgical challenges. Treatment options include non-operative measures with long term antibiotic suppression, debridement and implant retention (DAIR), one- or two-stage revision arthroplasty, arthrodesis and amputation. Implant retention without infection is ideal and DAIR has been reported to have variable success rates depending on patient factors, duration of infection, infecting micro-organisms, choice of procedure, single or multiple debridement procedures, arthroscopic or open, antibiotic choice and duration of antibiotic use. We present a thorough literature review of DAIR for infected TKA. The important factors contributing to failure are presence of sinus, immunocompromised patient, delay between onset of infection and debridement procedure, Staphylococcal infection in particular Meticillin Resistant Staphylococcal aureus, multiple debridement procedures, retention of exchangeable components and short antibiotic duration. In conclusion DAIR can be successful procedure to eradicate infection in TKA in selective patients with factors contributing to failure taken into account.
Key words: Debridement and implant retention / DAIR / Infected total knee arthroplasty / Prosthetic joint infection
© The Authors, published by EDP Sciences, 2017
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Knee replacement is an effective procedure for end-stage knee arthritis. According to the National Joint Registry report of 2013 , 22% of revision procedures were performed for infection and according to the National Joint Registry report of 2014  infection is the third most common cause of revision after aseptic loosening and pain with 1.06 revision per 1000 patient-years. It is, however, one of the most dreaded complications for orthopaedic surgeons because of significant morbidity and because of the surgical challenges it poses.
The treatment options for an infected total knee arthroplasty (TKA) are usually surgical as antibiotics in isolation are not an appropriate treatment unless there is significant co-morbidity providing a relative contra-indication for surgery . The surgical options include washout, debridement, antibiotics and implant retention (DAIR), one- or two-stage revision total knee arthroplasty, arthrodesis and amputation. Prosthetic joint infection (PJI) surgery also poses significant cost implications  as it could require multiple procedures, prolonged antibiotics, lengthy hospital stays and more expensive implants for revision surgery.
Two-stage revision arthroplasty is considered the gold standard for an infected prosthesis. However, it poses significant challenges to both patient and surgeon. Two operations with a substantial period of reduced mobility and significant anaesthetic and surgical risks are major concerns for the patient. There are significant challenges for the surgeon in removing a well-fixed prosthesis with removal of bone cement. This poses risk of significant damage to the remaining bone stock, making reconstruction difficult with increased risk of perioperative and postoperative complications and potentially compromising the soft tissue envelope.
Implant retention without infection is the ideal end result of treatment for an infected total knee arthroplasty. Some surgeons prefer to perform debridement of the knee, particularly in the case of acute infection, to reduce the infective organism load and supplement debridement with systemic antibiotics. Their aim is to retain the implant and to avoid further more invasive/complex surgery. There are no randomized controlled or prospective trials. The literature consists of various retrospective series both in Orthopaedic and Microbiology journals with variable opinions over each aspect of DAIR.
We, therefore, present a thorough review of literature for role of the DAIR procedure as a treatment option for infected TKA.
MEDLINE was searched using the PubMed and Embase interface to identify relevant studies pertaining to debridement and implant retention in infected knee arthroplasty up to June 2015. Keyword searches used were “prosthetic joint infection”, “infected knee arthroplasty”, “infected knee replacement”, “debridement”, “implant retention” and “DAIR”. Inclusion criteria included all articles which described implant retention for infected knee arthroplasty published in the English language or with abstracts in English.
PRISMA guidelines were used as shown in Figure 1.
Data extracted from the studies included patient factors, duration of symptoms, micro-organisms identified, procedure performed – open/arthroscopic and single/multiple debridement, duration of antibiotic and long-term results.
The principal outcome measure was failure of the procedure and was defined as failure to eradicate infection and need for further procedure that included revision, arthrodesis or amputation. Some of the key studies are shown in Table 1.
A patient’s innate immunity is a well-established factor for infection control after prosthetic joint infection (PJI). The risk factors for failure after DAIR are no different to any other surgical procedure. The condition of local soft tissues is of particular significance . Persistence of a sinus has been shown to be a risk factor for failure [5–7] and a contraindication to DAIR. Furthermore, DAIR relies on patient immunity to combat infection [4, 6, 8]; hence, it is not a suitable procedure in the immunocompromised individual. It may be appropriate in individuals with significant morbidity who are unsuitable for alternative surgical options with higher morbidity.
Various definitions of PJI have been described. The American Academy of Orthopaedic Surgeons working party proposed diagnostic criteria for PJI  to aid decision making. Cui et al.  classified infections into four types as shown in Table 2.
Success rates of 28%–62% have been shown with DAIR for late chronic or established Prosthetic Joint Infection as compared to 31%–100% with acute infections. Furthermore, acute postoperative infection has shown better results as compared to haematogenous spread [6, 11–21].
Many organisms have been isolated in infected total knee arthroplasty. Common pathogens include meticillin-sensitive and meticillin-resistant Staphylococcus aureus (MSSA and MRSA), coagulase-negative staphylococci, streptococci and Gram-negative bacteria. Staphylococcus aureus is generally pyogenic and often accounts for acute postoperative infections. Coagulase-negative staphylococci are often associated with late chronic or clinically unapparent infections, typically as a result of biofilm production.
Multiple studies have shown Staphylococcus aureus infection to be an independent risk factor for failure to eradicate infection [12, 18, 22–25]. MRSA, in particular, has shown high failure rates with DAIR [26–29]. Gram-negative organisms have shown a variable outcome in failure rates as compared to Gram-positive organisms [21, 30, 31]. The decision to retain implant should depend on pathogen e.g. not to retain in cases of MRSA infection as echoed by Zürcher-Pfundet et al. . DAIR has shown to be particularly effective in patients who are not immunocompromised and with PJIs caused by a low virulence organism e.g. coagulase-negative staphylococci [12, 23, 33].
The principles of debridement for infected arthroplasty are to withhold antibiotics and to aspirate the joint to identify organism prior to surgery. The surgical procedure includes removal of skin margins, excision of any sinuses, radical synovectomy and exchange of removable implants (polyethylene insert in case of total knee arthroplasty). In the case of a modular total knee replacement, removal of the polyethylene tibial insert is very important in order to gain access to posterior aspect of the joint. Choi et al.  showed that not exchanging the polyethylene insert was an independent risk factor for failure. Based on this, patients with an all-polyethylene tibial component might not be good candidates for implant retention.
The joint must have a thorough lavage. Recently there has been increased interest in using chlorhexidine gluconate 0.05%. Schwechter  undertook an in vitro research to investigate the replication of adherence of MRSA to orthopaedic implants by creating a biofilm model using titanium discs. They found chlorhexidine gluconate to be most effective in reducing bacterial colony counts and was superior to pulsed saline lavage.
A suction drain should be left in situ until there is minimal output. If drainage persists or if the infection fails to settle then consideration has to be given to a further debridement procedure. Continuous closed irrigation has not proven to be any more effective than standard procedure with primary closure and in situ drain .
A DAIR procedure cannot be carried out arthroscopically because this does not allow adequate debridement or exchange of the polyethylene insert. Some authors [40–42] have utilized arthroscopic washout in acute infections. Ilahi et al.  report 100% success in seven patients and Liu et al.  report 88% success rate in 15 patients they treated but others report a much lower success rate [42, 45] when compared to open debridement. We do not advocate this as the procedure of choice.
Most studies would regard the need for a further procedure as failure of the index procedure. Vilchez et al.  showed that repeat procedure was an independent predictor of failure. Therefore, repeated DAIR procedures are not recommended and indicate failure and need for alternative procedure [23, 37]. However, Mont et al.  performed that repeated DAIR is successful in early infection.
The choice of antibiotic will depend on a number of factors including susceptibilities of pathogens isolated, route of administration and likely duration of treatment. Regimens for intravenous or highly bioavailable oral antimicrobial treatment of particular pathogens have been recommended . Individual regimens should be chosen following discussion between orthopaedic surgeons and microbiologists or infectious disease specialists.
This by far is the most controversial issue in the treatment of prosthetic joint infection. The duration varies from no extended regimen  to indefinite . Byren et al.  treated their patients with systemic antibiotics for an average of 1.5 years and cited antibiotic duration as a major risk factor for failure. Puhto et al.  found no difference in the recurrence of infection when antibiotics were used for three or six months post-procedure, thus advocating shorter duration. Laffer et al.  showed similar results. Bernard et al.  showed that even six weeks of postoperative antibiotics had similar results as compared to long-term use. Moran et al.  recommend the use of broad spectrum agent in the early empirical antibiotic regime for PJI. We believe, however, that DAIR may require longer antibiotic use than in revision procedure. Nevertheless, it is agreed that the duration depends on the virulence of the offending pathogen, the need for repeat procedures and host factors. In some cases, chronic suppressive antibiotic therapy may be appropriate, especially in those for whom further surgical options are not possible for either medical or surgical reasons.
Failure of a DAIR procedure will necessitate alternative surgical options with two-stage procedure being the gold standard. Gardner et al. , Choi et al.  and Sherrell et al. , however, showed that a two-stage procedure, in a patient with previous debridement, has an inferior success rate and outcome when compared to a primary procedure. In the study by Choi , in 22 failed initial DAIR procedures, staged revision (11 knees), repeated incision and drainage (I&D) (11 knees), fusion (two knees), amputation (two knees) and resection (one knee) were performed.
We recommend a DAIR procedure in the acute postoperative period within four weeks of surgery or acute haematogenous infection of TKA within two weeks of onset. The procedure should be open rather than arthroscopic and the polyethylene insert exchanged where possible. Postoperative antibiotics should be given for six weeks and the progress monitored by clinical examination and inflammatory markers. Immunocompromise, MRSA infection, poor condition of local soft tissues and failure of one DAIR procedure should prompt revision arthroplasty.
Debridement, antibiotics and implant retention (the DAIR) procedure can be a successful treatment option for PJI in TKA. It can effectively eradicate infection, resulting in improved functional outcome and a reduction in the need of more extensive surgery which may be associated with far greater morbidity. Individual factors affecting outcome include patient factors, presence of sinus, duration of infection, virulence of organism, meticulous procedure, exchange of polyethylene insert and duration of appropriate antibiotic use. Failure of a DAIR procedure generally requires more radical procedures such as revision arthroplasty.
Authors SQ, AS, RA certify that they have no financial conflict of interest (e.g. consultancies, stock ownership, equity interest, patent/licensing arrangements, etc.) in connection with this article. The institution of authors SQ, AS, RA (University Hospitals of Leicester NHS Trust) has not received any funding related to this article.
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Cite this article as: Qasim SN, Swann A & Ashford R (2017) The DAIR (debridement, antibiotics and implant retention) procedure for infected total knee replacement – a literature review. SICOT J, 3, 2