J Bone Joint Infect 2017; 2(3):136-142. doi:10.7150/jbji.18408

Short Research Communication

Brucella melitensis prosthetic joint infection

Domenica Flury1, Henrik Behrend2, Parham Sendi3, Matthias von Kietzell1, Carol Strahm1 Corresponding address

1. Department of Infectious Diseases, Cantonal Hospital of St. Gallen, St. Gallen;
2. Department of Orthopaedics and Traumatology, Cantonal Hospital of St. Gallen, St. Gallen;
3. Department of Infectious Diseases, Bern University Hospital, University of Bern, Bern, Switzerland.

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How to cite this article:
Flury D, Behrend H, Sendi P, von Kietzell M, Strahm C. Brucella melitensis prosthetic joint infection. J Bone Joint Infect 2017; 2(3):136-142. doi:10.7150/jbji.18408. Available from http://www.jbji.net/v02p0136.htm

Abstract

Periprosthetic joint infection (PJI) due to Brucella spp. is rare. We report a case in a 75-year-old man and review 29 additional cases identified in a literature search. The diagnosis of Brucella PJI is challenging, in particular in non-endemic countries. Serological tests prior to joint aspiration or surgical intervention are reasonable. Involvement of infection control and timely information to laboratory personnel is mandatory upon diagnosis. There is no uniform treatment concept, neither with respect to surgical intervention nor for the duration of antimicrobials. Most cases have a successful outcome, irrespective of surgical modality, and with an antimicrobial combination regimen for 12 or more weeks.

Keywords: Brucella, Periprosthetic joint infection

Intraduction

Periprosthetic joint infection (PJI) due to Brucella is rare. We present a case of PJI due to Brucella melitensis and review the literature with respect to clinical presentation, diagnosis and treatment.

Case Report

A 75-year-old man from Turkey presented with a six-months history of progressing knee pain. His personal history included total right knee arthroplasty (TKA) because of osteoarthritis 12 years prior to, and one stage exchange due to aseptic loosening 4 years prior to admission. On presentation, radiographs of the right knee showed loosening of the prosthesis with migration of the tibial component (Figure 1a, b). Before referral to our center, B. melitensis grew in synovial fluid specimen obtained via arthrocentesis.

The patient was born and raised in Turkey: He had moved to Switzerland at the age of 44. He reported to spend his summers in Turkey. There, he owns a house in a rural area, and commonly ingests fresh unpasteurized cheese and milk.

On presentation, he was afebrile and no episodes of fever or night sweats were reported. Blood tests showed a C-reactive protein (CRP) of 18 mg/l (norm < 8 mg/l); leukocytes and thrombocytes were within normal range. Chest and lumbar radiographs, as well as abdominal ultrasound, were normal. Two sets of blood cultures remained negative. Serological test for antibodies against Brucella spp. were positive (IgG/IgA of 1:240 U/mL, normal < 20 U/ml; Brucella IgG/M/A Serion ELISA classic, SERION® Immunologics, Wuerzburg, Germany).

A combined antimicrobial therapy consisting of doxycycline 100 mg twice per day and intravenous (IV) gentamicin 5 mg/kg once daily was started one week prior to surgery. The surgical plan included a two-stage exchange with a short interval. After removal of the implant, a mobile antibiotic loaded spacer (containing gentamicin and vancomycin) was implanted. Surgery was carried out under aerosol isolation precautions and laboratory personnel were informed about possible risk of exposure. B. melitensis grew in 3, and Propionibacterium acnes in 4 out of 10 obtained biopsies, sonication was negative. Thus, penicillin was added to the regimen (24 million units IV divided in 6 doses per day). After 2.5 weeks, a revision TKA was implanted (LCS Revision®, DePuy Synthes, Warsaw, IN). The further clinical course was uneventful. In the postoperative period, treatment with rifampin 450 mg twice per day was added, and gentamicin discontinued. Because P. acnes proved to be susceptible to doxycycline, treatment with penicillin was stopped and continued with doxycycline plus rifampin. Three months after surgery, monotherapy with doxycycline for another three months was prescribed.

At the 2-year follow-up examination, the patient reported good joint function (ROM 0/5/105, WOMAC-Scale 12, VAS 80, EQ-5D 1) without clinical signs of infection. Radiographs showed a properly aligned TKA and no signs of loosening (Figure 1cd).

 Figure 1 

Initial anteroposterior (a) and lateral (b) radiographs at referral showing a loose and displaced femoral and tibial component. Anteroposterior (c) and lateral (d) radiographs at follow-up 2 years after reimplantation.

J Bone Joint Infect Image (Click on the image to enlarge.)

Review of the Literature

Methods

For identifying published case reports, PubMed, PMC and Scopus databases were searched using the search string “Brucell* AND (prosth* OR replacement OR arthroplasty) AND (knee OR hip OR joint)”. Further a google query for “Brucella PJI” was performed. No restriction for time period of publications was applied. Two authors (DF and CS) reviewed titles and abstracts without restriction on date or language. Cases with symptoms consistent with PJI and Brucella spp. recovered from either synovial fluid culture or biopsy samples were included.

 Table 1 

Demographics and diagnostics

Patient NoDemographicsCountry of
Exposure
Involved
Prosthesis
Age of PJ
(months)
Previous
Revisions
SymptomsCulturesBrucellaReferences
Age & sexExposure riskSpeciesAspirationTissueBlood CultureCo-infectionSerologies*
124, fnaSaudi ArabiaTKR bilateral2nolocal symptomsB. melitensisposnananopos1
272, munpasteurized dairy productsTurkeyTKR48nolocal symptomsB. melitensisnaposnegnopos2 (27)
350, mfarmer, cattleSpainTHR0nosystemic and localB. melitensisnaposposnopos3
471, mfarmer, cattleSpainTHR36nolocal symptomsB. melitensisnaposnayesna3
567, fnaMexicoTHR24nolocal symptomsB. abortusnegposnanona4 (26)
665, funpasteurized dairy productsPortugalTKR bilateralnanosystemic and localB. melitensisnegposnanona5
763, funpasteurized dairy productsTurkeyTKR24yessystemic and localB. melitensisnegposnegnopos6
871, fnaSpainTKR48nosystemic and localBrucella spposnananopos7
968, fnaIranTKR12nolocal symptomsBrucella spnegposnanona8
1054, mfarmerUnited StatesTHR6nosystemic and localB. abortusnegposnanopos9
1162, mnaTurkeyTKR24nosystemic and localB. melitensisposnananopos10
1247, munpasteurized dairy productsLebanonTHR168nolocal symptomsBrucella spnaposnanopos11
1379, mcontact with cattleIsrael/ ArgentinaTKR144nolocal symptomsB. melitensisnaposnanona12
1451, mcontact with goatsThailandTKR60nosystemic and localB. melitensisposnaposnopos13
15naunpasteurized dairy productsIndiaTHRnananaB. melitensisposnananana14
1674, mshepherdGreeceTKR bilateral4nosystemic and localB. melitensisposnaposnopos15
1767, funpasteurized dairy productsItalyTKR bilateral48nolocal symptomsBrucella spnegposnanona16
1874, munpasteurized dairy productsItalyTKR108nolocal symptomsB. melitensisnaposnanopos17
1965, fnaTurkeyTKR bilateral96nosystemic and localB. melitensisposnananopos18
2063, mcontact with cattleSpainTHR60nolocal symptomsB. melitensisposposnegnona19
2160, mcontact with goatsSpainTKR14nolocal symptomsB. melitensisposnanegnopos20
2266, fcontact with cattleSpainTHR36nolocal symptomsB. abortusposnananona21
2371, mfarmer, cattleSpainTHR63yeslocal symptomsB. melitensisnaposnanopos21
2468, mnaItalyTKR24nolocal symptomsB. melitensisposnananopos22
2556, mfarmer, sheepSpainTHR60nosystemic and localB. melitensisposnanegnopos23
2638, munpasteurized dairy productsIsraelTHR48nolocal symptomsB. melitensisnegposnanopos24
2761, munpasteurized dairy productsIsraelTKR36yeslocal symptomsB. melitensisposposnayespos24
2867, munpasteurized dairy productsIsraelTKR168nosystemic and localB. melitensisposnananopos24
2964, funpasteurized dairy productsTurkeyTKR60nolocal symptomsB. melitensisposnananopos25
3075, munpasteurized dairy productsTurkeyTKR144yeslocal symptomsB. melitensisposposnegyesposthis case

* Serum agglutination (=standard tube agglutination (SAT)) was used in most cases. Only positive results were quoted because of limited comparability among the different tests used; THR total hip replacement; TKR total knee replacement; PJ prosthetic joint; na not available.

Results

The literature screening procedure is illustrated in Figure 2. Twenty-five published articles describing 29 patients were identified [1-25] (Table 1). Three of them were co-infections. Two articles describing the same patients were excluded [26, 27].

Most patients were male and originated from southern Europe (Spain, Portugal, Italy, Portugal, Greece), or the Middle East (Turkey, Israel, Lebanon, Iran, Saudi Arabia). The majority reported a history that was congruent with the pathogenesis (e.g., regular consumption of unpasteurized dairy products, occupational exposure to animals).

Eleven hip and 19 knee infections were described. The range of time interval between implantation of the prosthesis and the diagnosis of PJI was very broad (from immediately postoperative up to 168 months) with a median of 48 months. 62% (18/29) of patients had only local symptoms, and 38% (11/29) both systemic (mainly fever, malaise) and local symptoms. More than half of the patients (17/29) had a radiologically documented loosening of the implant. Twenty-three cases of B. melitensis, three of B. abortus and four cases of Brucella sp. were described. Diagnosis was mostly made by positive joint aspiration cultures (16/23). When no aspiration was performed (7/30) or aspiration culture was negative (7/23) intraoperative tissue biopsies were diagnostic. Only three cases had reported positive blood cultures. All cases with reported serology results revealed positive anti-Brucella antibodies (21/21). Three co-infections were documented, our case with P. acnes, one with viridans-group streptococci and one with Acinetobacter baumanii. In patients with radiological documented loosening, a one-stage exchange was performed in three, removal of the implant without replacement in one, and a two-stage exchange with a long interval (between 6 weeks and 6 months, median 8 weeks) in 12 cases. In twelve patients without implant loosening, eight patients were treated conservatively (i.e. without surgery), two had a debridement with retention of the prosthesis and one had a one-stage and two-stage exchange, respectively. The outcome of all patients was reported as good. However, a follow up of a year or more was reported in only 23/30 cases (maximal 10 years, median 2 years). Moreover, we cannot exclude a publication bias (i.e., only cases with a good outcome are reported). The antimicrobial regimen consisted of doxycycline and rifampin in most cases, with or without an aminoglycoside (streptomycin or gentamicin). In single cases quinolones or trimethoprim-sulfamethoxazole were used as a salvage treatment. The duration of antibiotic therapy varied markedly (median 16 weeks, range 6 weeks to 2 years) (Table 2).

 Figure 2 

Flow-chart for literature research.

J Bone Joint Infect Image (Click on the image to enlarge.)
 Table 2 

Treatment and follow-up.

Patient NoImplant
Loosening
Surgical
Treatment
Implant-free
Interval (weeks)
Antimicrobial Treatment
and Duration (weeks)
Good
outcome
Follow-up
(years)

References
1nononeDox/Rif 76wyes1.51
2noDAIR (arthroscopy)Dox/Rif 6wkyes12 (27)
3nononeStrep(2w)/Dox 106wyes53
4yesone-stage exchangeStrep(1.5w)/Doxy/Rifa 25.5 wyes33
5yestwo-stage exchange24Dox/Rif 20wyes24 (26)
6yestwo-stage exchange6Dox/Rif 12 wyes105
7nononeDox/Rif 16wyes36
8nononeDox/Rif 6.5w; then Strep(3w)/Dox 12wyes<17
9notwo-stage exchange24nanana8
10noone-stage exchangeTet 6w, then Tet 24w, then Strep(6w)/Tet 58wyes29
11yestwo-stage exchange12Dox/Rif 12wyes1010
12yesone-stage exchangeDox/Rif 20wyes411
13yestwo-stage exchange8Gen(3w)/Dox/Rif 25w, then Dox/Rif/Bact >52wyes<112
14nononeGen(2w)/Dox/Rif 24wyes113
15nanananana14
16nononeStrep(3w)/Dox 20w, then Bact 8wyes215
17yestwo-stage exchange12Dox/Rif 12 wyes1.516
18yesImplant removalStrep/Dox 4w, then Dox/Rif/Levo 32wyes< 117
19yestwo-stage exchange20Dox/Rif 16wyes218
20yestwo-stage exchange16Strep/Dox/Rif 12wyes<119
21nononeStrep/Dox/Rif 6wyes<120
22yestwo-stage exchange16Dox/Rif 6wyes5.521
23noDAIRStrep(6w)/Dox/Rif 24wyes521
24nononeDox/Rif 8wyes122
25yestwo-stage exchange8Strep(2w)/Dox/Rif 8wyes423
26yestwo-stage exchange6Dox/Rif 12 wyes124
27yestwo-stage exchange6Dox/Rif 12 wyes124
28yestwo-stage exchange6Dox/Rif 12 wyes124
29yesone-stage exchangeDox/Rif 24 wyes1.525
30yestwo-stage exchange2.5Dox/Rif/Pen 24wyes2this case

Strep: Streptomycin; Gen: Gentamicin; Dox: Doxycycline; Rif: Rifampin; Bact: Trimethoprim-Sulfamethoxazole; Levo: Levofloxacin; Tet: Tetracycline; Pen: Penicillin G; DAIR: debridement, antibiotics, irrigation and retention.

Discussion

The preoperative diagnosis of Brucella PJI is a challenge in non-endemic countries, mainly because of the rarity of the disease, and hence, lack of clinical experience. The microbiological analyses of synovial fluid in patients with suspected PJI is part of the routine diagnostic procedure in many centers. In case of Brucella PJI, however, this intervention - without the required aerosol precautions - may expose personnel both in the operating room and microbiology laboratory to the pathogen [28]. In contrast, serological tests for brucellosis in previously untreated patients and in non-endemic region are reliable and safe diagnostic tools [29]. Our and all reported cases revealed significant elevated anti-Brucella-antibodies. Thus, it is conceivable to think of brucellosis and perform serological tests prior to synovial puncture, when the patient history (e.g., exposure to unpasteurized dietary products) or his ethnicity points towards this differential diagnosis.

In cases of suspected or confirmed Brucella PJI, infection control precautions are necessary prior to a surgical intervention. Laboratory staff must be pre-informed about potential growth of Brucella spp. when biopsy samples are sent for analyses [14, 28, 30]. Our literature review indicates that cultures of intra-operative tissue samples provide the best yield.

There is no uniform recommendation for the surgical procedure in Brucella PJI. Loose implants must be exchanged, and successful outcomes with both one-stage and two-exchanges have been reported. Although a wide range of time periods for the implant-free interval have been reported (i.e., 6 weeks to 6 months), we were unable to find a scientific rational against a short interval. Although, Brucella spp. have shown to form Biofilm in vitro [31, 32], to the best of our knowledge, there are no reports on Brucella-associated biofilm production on orthopedic implants. Thus, the clinical significance of in-vitro results requires further investigations. The overall good prognosis of Brucella PJI irrespective of applied treatment concept supported our surgical concept of a short interval.

Antimicrobial treatment for brucellosis requires a combination regimen, because high relapse rates have been reported with monotherapy. Rifampin, doxycycline, ciprofloxacin, trimethoprim-sulfamethoxazole and aminoglycosides have good activity against brucellosis. Antimicrobial drug resistance is unusual but can be determined by the Etest method [33]. Doxycycline plus streptomycin or doxycycline plus rifampin are the most commonly-used combinations [34-36]. Given the side effects of aminoglycosides, in particular in the elderly, we prefer not to use gentamicin or streptomycin for a prolonged treatment period.

It may be reasonable to start antimicrobial treatment prior to surgical intervention to lower the bacterial load, provided that Brucella spp. and other microorganisms are isolated from a preoperative joint puncture. In 10% of the described cases, a polymicrobial infection was reported. In retrospect, P. acnes may have been missed in our case.

The optimal treatment duration in Brucella PJI is unknown. In brucellosis, irrespective of infection site, less than 6 weeks with monotherapy is associated with failure [37]. In analogy to treatment recommendation for brucellar spondylitis, we targeted a combination therapy of at least 12 weeks [35].

Conclusions

Brucella PJI is rare, and the diagnosis is often unexpected in non-endemic countries. Thinking of risk factors and ethnicity is the key to the diagnosis. Serological tests should be performed prior to joint puncture or surgical interventions. In case of positive anti-Brucella-antibodies, infection control must be involved and laboratory personnel informed prior to obtaining samples. Our review of the literature indicates that the prognosis is good, irrespective of surgical treatment modality. In rare cases, a polymicrobial infection can occur. On the basis of these data, and with respect to a shorter hospitalization period and better joint function, we prefer either a one-stage exchange or a two-stage exchange with a short interval in case of loose implants. A combination antimicrobial regimen is recommended, though, the optimal treatment duration is unknown. In our case, a 3-month course of doxycycline plus rifampin, followed by a 3 month-course of doxycycline monotherapy showed a successful outcome.

Competing Interests

The authors have declared that no competing interest exists.

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Author contact

Corresponding address Corresponding author: Carol Strahm, M.D., Department of Infectious Diseases, Cantonal Hospital of St. Gallen, 9007 St. Gallen, Switzerland Tel. +41 71 494 26 33 Fax. +41 71 494 63 39 Carol.Strahmch


Published 2017-4-5