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Background:
Systematic Review

The Role of Single Positive Cultures in Presumed Aseptic Total Hip and Knee Revision Surgery—A Systematic Review of the Literature

by
Jan Schwarze
*,
Burkhard Moellenbeck
,
Georg Gosheger
,
Jan Puetzler
,
Niklas Deventer
,
Tobias Kalisch
,
Kristian Nikolaus Schneider
,
Sebastian Klingebiel
and
Christoph Theil
Department of General Orthopedics and Tumor Orthopedics, University Hospital Muenster, Albert-Schweitzer-Campus 1, 48149 Muenster, Germany
*
Author to whom correspondence should be addressed.
Diagnostics 2023, 13(9), 1655; https://doi.org/10.3390/diagnostics13091655
Submission received: 30 January 2023 / Revised: 22 April 2023 / Accepted: 5 May 2023 / Published: 8 May 2023
(This article belongs to the Special Issue Diagnosis and Treatment of Periprosthetic Joint Infections)
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Abstract

:
(1) Background: Prior to revision hip (THA) or knee arthroplasty (TKA), periprosthetic low-grade infection (PJI) should be ruled out. Despite advances in preoperative diagnosis, unsuspected positive cultures (UPCs) may occur in initially planned aseptic revisions. Particularly, single UPCs pose a diagnostic and therapeutic dilemma, as their impact on outcome is unclear and recommendations are heterogeneous. This review investigates the frequency of single UPCs and their impact on implant survivorship. (2) Methods: In July 2022, a comprehensive literature search was performed using PubMed and Cochrane Library search. In total, 197 articles were screened. Seven retrospective studies with a total of 5821 cases were able to be included in this review. (3) Results: Based on the cases included, UPCs were found in 794/5821 cases (14%). In 530/794 cases (67%), the majority of the UPCs were single positive. The most commonly isolated pathogens were coagulase negative Staphylococci and Cutibacterium acnes. Five of seven studies reported no influence on revision- or infection-free survival following a single positive culture. In two studies, single UPCs following THA revision were correlated with subsequent re-revision for PJI. (4) Conclusions: Single UPCs of a non-virulent pathogen following presumed aseptic TKA revision may be interpreted as contaminants. A single UPC following THA revision may be a risk factor for subsequent PJI. The role of systemic antibiotic treatment remains unclear, but it should be considered if other risk factors for PJI are present.

1. Introduction

Revision surgery for total knee arthroplasty (TKA) and total hip arthroplasty (THA) is estimated to increase by 332% and 137%, respectively, from 2012 to 2030 [1]. Prior to planned THA or TKA revision, periprosthetic joint infection (PJI) should to be ruled out [2]. PJI following THA and TKA revision is a leading cause for repeat revision surgery and is associated with disastrous consequences, such as immobilization of the patient, amputations, and increased mortality of up to 21% after 5 years [3,4,5,6,7,8,9,10]. Therefore, PJI frequently results in prolonged hospitalization of the patient due to repeat revision surgery and antibiotic treatment, causing high costs for the health care system and the community [8,9].
PJI is usually diagnosed using validated criteria, such as criteria published by the Musculoskeletal Infection Society (MSIS), the International Consensus Meeting (ICM), the European Bone and Joint Infection Society (EBJIS), the Infectious Diseases Society of America (IDSA), and the American Academy of Orthopaedic Surgeons (AAOS) [2,11,12,13,14,15,16]. These frequently updated diagnostic algorithms consist of a combination of clinical signs of infection, inflammatory parameters in blood serum and synovial fluid, and microbiological findings in the preoperative joint aspirate and intraoperative samples, including histological investigation as well. Although numerous diagnostic algorithms for the diagnosis of a PJI of THA and TKA exist, the diagnostic accuracy varies, and there is no “gold standard” for the preoperative diagnosis of a possible “low-grade” PJI as an underlying cause of prosthetic failure.
The World Association against Infection in Orthopedics and Trauma (WAIOT) proposed a definition of PJI regarding clinical appearance [17]. While patients with acute or “high-grade” PJI often present with suspicious clinical signs for infection such as fever, local swelling, dermal erythema, and pain, and further diagnostics often provide elevated infection parameters in the blood serum, patients with chronic or “low-grade” PJI may lack clinical signs of infection, and serum infection parameters may be normal [6,18,19]. Therefore, the correct diagnosis in cases of chronic or “low-grade” infections of TKA and THA is challenging and a topic of high interest among orthopedic surgeons.
Furthermore, in patients with PJI, isolation of a causative pathogen in the joint aspirate can be difficult, as microbiological cultures from synovial fluid vary in their accuracy of the identification of the causative pathogen. The reported sensitivity of aspiration cultures ranges from f 12 to 94% [20]. In addition, the combination of preoperative microbiological and histopathological sampling has recently been associated with elevated sensitivity for the detection of PJI [21]. Nonetheless, even if the preoperative workup is not suspicious for PJI, the intraoperative collection of three to five tissue samples for a following microbiological investigation is recommended during THA and TKA revision [22,23]. Therefore, unsuspected positive cultures (UPCs) may occur in routinely collected tissue samples during THA and TKA revision preoperatively classified as aseptic [24].
UPCs may occur in up to 37% of planned aseptic THA and TKA revisions [24]. These UPCs have been of rising interest to orthopedic surgeons in the last decade because they have been associated with subsequent PJI while underlying patient-, procedure-, or implant-related risk factors are vastly unknown. In the current literature, male sex, obesity, chronic kidney disease, benign prostate hyperplasia, elevated serum C-reactive protein (CRP), and revision for adverse metal reaction and component loosening are discussed as possible risk factors for finding UPCs or subsequent revision for PJI [25,26,27,28,29,30,31,32].
Two or more UPCs of the same pathogen have been associated with decreased infection-free and revision-free survival following planned THA and TKA revision [24,33,34,35]. The most commonly reported pathogens isolated in patients with UPCs are low-virulent bacteria such as coagulase-negative Staphylococci and Cutibacterium acnes [24,33,36,37,38,39,40,41,42].
In contrast, the role of single UPCs remains a subject of debate regarding their impact on infection-free survival following aseptic THA and TKA revision. While the IDSA defines a single positive culture of a high-virulent pathogen (e.g., Staphylococcus aureus) as possible evidence for PJI, occurrence of a single positive culture of a low-virulent organism like coagulase-negative Staphylococci (CoNS) or Cutibacterium acnes is often considered to be a possible contamination of the specimen [12]. In contrast, there is growing evidence that single positive cultures may be associated with a higher risk of reinfection and repeat revision surgery [43,44].
In the current clinical practice, the MSIS and ICM guidelines define a single positive culture as a “minor criteria” for PJI, adding two points to a score classifying a joint as “infected” if it reaches six or more points [2,15]. In addition, the EBJIS criteria consider a single positive culture in an “infection likely” scenario if a second parameter (e.g., positive clinical feature or CRP) is positive [13].
The goal of this literature review is to systematically analyze the impact of single positive UPCs on infection-free survival following planned aseptic THA and TKA revision surgery.

2. Materials and Methods

A comprehensive literature research of publications prior to 20 July 2022 was performed using the PubMed and Cochrane Library search. Search Terms were “single positive cultures hip OR single positive cultures knee”, and “unsuspected pji knee arthroplasty OR unsuspected pji hip arthroplasty OR unexpected positive cultures hip arthroplasty OR unsuspected positive cultures hip arthroplasty OR unexpected positive cultures knee arthroplasty OR unsuspected positive cultures knee arthroplasty”. The search was restricted to studies on humans published between 1988 and July 2022 for papers in English. The review algorithm was based on the updated Preferred Reporting Items for Systematic Review and Meta-Analyses 2020 (PRISMA) guideline [45], and search results are presented in a PRISMA flow diagram (Figure 1).
Titles and abstract were reviewed independently by two authors (Jan Schwarze and Christoph Theil). Following exclusion based on title and abstract, a full text was obtained and reviewed. The study quality of included research was determined using the Methodological Index for Non-Randomized Studies (MINORS) checklist [46] to display a quality score. The level of evidence was assessed using the Oxford Centre for Evidence-Based Medicine (OCEBM) levels of evidence (OCEBM Levels of Evidence Working Group, 2011).
Unsuspected positive cultures were defined as the isolation of a pathogen from intraoperative cultures taken during THA or TKA revision preoperatively classified as aseptic.
Studies were included if they reported UPCs in presumed aseptic THA or TKA revision. Studies in which single positive cultures were not investigated or declared as contamination and therefore classified as “sterile” were excluded. Only studies analyzing complications of any kind (such as re-revision) following single UPCs were included. Case reports or reviews were not included in this study.
We investigated the number of included cases, preoperative workup, type and amount of taken samples in revision surgery, amount of single UPCs, type of pathogens, therapeutic consequences following a single UPC, and follow-up for complications.
Statistical analysis was performed using Microsoft Excel (Microsoft Corporation, Redmond, WA, USA) and SPSS Statistics for Windows Version 25 (IBM Corporation, Armonk, NY, USA).

3. Results

In total, 197 articles were screened. Applying the inclusion criteria, seven studies were included in this review (Figure 1). All studies had a retrospective design and were classified as level 3 according to OCEBM (OCEBM Levels of Evidence Working Group, 2011). One registry-based study was included; of the remaining six studies, one was a multi-center study, and five studies investigated data of a single-center origin. Three studies investigated revision THA, two investigated TKA, and two studies included THA and TKA (Table 1).
The number of samples taken was reported in all seven studies. In most studies (six of seven), three to five intraoperative samples were taken during revision surgery (Table 2).
Five of the included studies reported an average follow-up ranging from 40 to 68 months (Table 2). The minimum follow-up for subsequent complications following a single UPC was 12–60 months (Table 2). Information on the preoperative diagnostic algorithm to rule out PJI before revision surgery was available in six of seven studies and mostly included clinical examination, plain radiographs, examination of serum infection parameters such as CRP, and, in most cases (five of seven), a selectively performed synovial fluid aspiration. A routinely performed aspiration of synovial fluid prior to revision surgery was performed in one study (Table 3).
Of all included 5821 presumed aseptic THA or TKA revisions, UPCs occurred in 794 cases (14%). A total of 67% (530/794) of UPCs were single positive (Table 4).
The most commonly isolated pathogens were low-virulent bacteria, predominantly CoNS and Cutibacterium acnes (C. acnes).
Of the included seven studies, five reported no statistically significant influence on the revision- or infection-free survival following a single positive culture [24,25,33,47,48]. Barrack et al. found that in 29 cases with a single UPC, no revision surgeries were performed [33]. In the cohort of Vargas-Revéron et al., patients with two or more UPCs had a higher re-revision rate after 5 years (23.1% vs. 3.2%). However, in their study, a single UPC was not associated with an increased risk for re-revision [47]. Neufeld et al. reported infection-free survival after two and five years for their entire cohort of 93.1% and 86.8%, respectively. In THA revisions, the rate of survivorship free from infection with the same organism cultured during presumed aseptic revision was 93.7% after five years [25]. For revision TKA, Neufeld et al. reported infection-free survival rates of 97.5% and 95.3% after two and five years, respectively. Again, the rate of survivorship free from infection with the same organism cultured during presumed aseptic revision was 98.7% after five years. They reported no statistically significant difference in the five-year infection-free survival in patients with a single UPC and ≥two positive UPCs [48]. In both their studies, cases with all sterile intraoperative cultures were not included to be used as a control group [25,48]. In contrast, Schwarze et al. included patients with all negative cultures as a control group. In their study, a single UPC had no impact on the revision-free survival rate after two and five years compared to the control group (66.2% vs. 76.7% and 59.8% vs. 70.6%, respectively, p = 0.13) after THA revision or TKA revision (78.4% vs. 76.6% and 59.9% vs. 63.5%, respectively, p = 0.85). In addition, the infection-free survival rate after two years following THA revision (90.9% vs. 95.4%, p = 0.17) and TKA revision (91.9% vs. 96.7%, p = 0.79) showed similar results for a single UPC compared to the sterile control group [24].
Information regarding antibiotic therapy following a single UPC was available in four of seven studies. In the cohort of Barrack et al. only 5 of 29 single UPC cases received antibiotic treatment for 4 to 6 weeks, and no patient underwent revision surgery [33]. In the study of Vargas-Reverón et al., 6 of 35 cases of single UPCs received antimicrobial therapy for 4 weeks [47]. In contrast, Hipfl et al. reported that none of the 41 single UPC cases received antibiotic treatment, as they were considered to be contaminations [35]. Neufeld et al. (2021 and 2022) did not specify in which cases (single or ≥two UPCs) antibiotic treatment was commenced [25,48]. Schwarze et al. reported that in 59 of 119 (50%) cases, antibiotic treatment was started following a single UPC. Furthermore, antibiotic therapy of a single UPC had no influence on the 2 years of infection-free survival in their cohort [24].
In the included registry-based study by Milandt et al. and the single center study by Hipfl et al., a single UPC following THA revision was correlated with increased risk for re-revision for PJI compared to culture-negative revisions and those with ≥two UPCs [35,44]. In detail, Hipfl et al. in their study on revision THA reported a seven-year survival rate of 97.5% in patients with negative cultures, 87.4% for a single UPC, and 94.4% for patients with ≥two UPCs [35]. In addition to these results, Milandt et al. reported an increased risk for re-revision due to PJI for single UPCs compared to the sterile control group, with a relative risk (RR) of 2.63 (95% CI 1.16–5.96), and when excluding “mixed growth revision”, the RR was 2.44 (95% CI, 1.02–5.84) for single UPCs in their cohort [44].

4. Discussion

Although a variety of established and validated diagnostic criteria for PJI exist, orthopedic surgeons may be confronted with UPCs in revision arthroplasty that was previously classified as aseptic. Previous studies suggested postoperative antibiotic treatment for PJI if two or more positive cultures of the same pathogen occurred.
In this systematic review, a single UPC in revision TKA had no influence on infection-free survival. In contrast, single positive UPCs following THA revision were correlated with subsequent PJI in two studies [35,44]. Interestingly, even compared to patients with ≥two UPCs, re-revision for PJI was more likely. Unfortunately, information on the causative pathogen in the subsequent re-revision for PJI was not available in these two studies, making further studies necessary to discriminate PJI persistence from possible recurrent PJI with a different pathogen. Neufeld et al. (2021 and 2022) also investigated infection-free survival, defining “PJI with the same microorganism” as the primary endpoint. However, they did not include aseptic cases as a control group and therefore limited their results to comparing single UPCs to ≥two UPCs [25,48].
Previous studies reported implant- and patient-related risk factors for PJI following revision arthroplasty, including adverse metal reaction, use of megaprosthesis, implant loosening, elevated serum CRP prior to revision surgery, obesity, and male sex [24,25,32,49]. Staats et al. reported a reduced implant survival rate in patients with a MSIS minor criteria for PJI (such as single UPCs) in combination with implant loosening compared to those without radiological signs of component loosening [31]. Since none of the included studies investigated the abovementioned combination of possible risk factors following PJI, a confounder bias for a single UPC as a risk factor for subsequent prosthetic failure due to PJI may be possible. In this context, further investigation of a combination of known patient- and implant-related risk factors for PJI and single UPCs may reveal new insights in terms of differentiation between contamination, colonization, and infection.
Sonication of THA and TKA components has been reported to improve the isolation of pathogens in revision arthroplasty, as it provides higher sensitivity compared to conventional tissue samples [50,51]. To further clarify the role of single positive UPCs, implant sonication in combination with tissue samples may offer additional information regarding the discrimination of possible contamination of the specimen and unsuspected low-grade PJI. In the included seven studies, only one (Hipfl et al. [35]) used implant sonication.
Furthermore, to discriminate contamination of the specimen from chronic low-grade PJI, additional histopathological investigation of the periprosthetic soft tissue as published by Krenn et al. may offer significant information in cases of single positive UPCs [52]. Alternatively, microscopic count of neutrophils per high-power field can be used as recommended in the MSIS and ICM criteria [2,15].
Despite the fact that this review was performed systematically, several limitations have to be mentioned. The results of this review may be limited by the small number of included studies. Although the inclusion criteria were very specific, the included studies were heterogeneous regarding their methods and interpretation of results. In particular, the number of taken samples, types of samples, and criteria for the use of antibiotic therapy following a single UPC were not consistent among the included studies. Furthermore, all included studies were of a retrospective design. Therefore, the results of this review should be interpreted with caution and not be extrapolated indiscriminately.
The results of this review highlight the need for further studies investigating single UPCs, especially in cases of THA revision since contradictory results are reported in the literature.

5. Conclusions

A single UPC of a non-virulent pathogen following presumed aseptic TKA revision may be interpreted as a contaminant in absence of further criteria for PJI. In contrast, a single UPC following THA revision previously classified as aseptic may be a risk factor for subsequent PJI. The included literature does not provide a general recommendation regarding antibiotic treatment of single UPCs following THA or TKA revision.

Author Contributions

J.S.: literature review, data collection, data analysis, draft of the manuscript, conceptualization, proofreading of the manuscript; B.M.: conceptualization, proofreading of the manuscript; G.G.: conceptualization, proofreading of the manuscript, supervision; J.P.: conceptualization, proofreading of the manuscript; N.D.: proofreading of the manuscript, layout; T.K.: proofreading of the manuscript, statistics; K.N.S.: proofreading of the manuscript; S.K.: proofreading of the manuscript; C.T.: literature review, data analysis, statistics, draft of the manuscript, conceptualization, proofreading of the manuscript. All authors have read and agreed to the published version of the manuscript.

Funding

The APC was provided by the Open Access Publication Fund of the University of Muenster.

Institutional Review Board Statement

Approval of the institutional review board was obtained prior to this investigation (local ethical committee ref. no. 2019-227-f-S).

Informed Consent Statement

Not applicable.

Data Availability Statement

All underlying data is included in the text, tables, and figures.

Acknowledgments

We acknowledge support from the Open Access Publication Fund of the University of Muenster.

Conflicts of Interest

The authors declare that they have no conflict of interest.

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Diagnostics 13 01655 g001 550
Figure 1. PRISMA Flow Diagram.
Figure 1. PRISMA Flow Diagram.
Diagnostics 13 01655 g001
Table
Table 1. Included Articles.
Table 1. Included Articles.
DateAuthorJournalTitleTypeArthroplastyOCEBM
Level of Evidence		MINOR Score
2007
September		Barrack et al. [33]Journal of ArthroplastyThe fate of the unexpected positive intraoperative cultures after revision total knee arthroplastyRetrospective,
Multi Center		TKA317
2019
June		Milandt et al. [44]Clinical Orthopaedics and Related ResearchA Single Positive Tissue Culture Increases the Risk of Rerevision of Clinically Aseptic THA: A National Register StudyRetrospective, Registry StudyTHA321
2020
July		Vargas-Reverón et al. [47]Journal of ArthroplastyPrevalence and Impact of Positive Intraoperative Cultures in Partial Hip or Knee RevisionRetrospective, Single CenterTHA
TKA		319
2021
June		Hipfl et al. [35]The Bone and Joint JournalUnexpected low-grade infections in revision hip arthroplasty for aseptic loosening: a single-institution experience of 274 hipsRetrospective, Single CenterTHA317
2021
August		Neufeld et al. [25]The Journal of Bone and Joint SurgeryPrevalence and Outcomes of Unexpected Positive Intraoperative Cultures in Presumed Aseptic Revision Hip ArthroplastyRetrospective, Single CenterTHA319
2022
May		Neufeld et al. [48]Journal of ArthroplastyThe Prevalence and Outcomes of Unexpected Positive Intraoperative Cultures in Presumed Aseptic Revision Knee ArthroplastyRetrospective, Single CenterTKA320
2022
June		Schwarze et al. [24]Journal of ArthroplastyUnsuspected Positive Cultures in Planned Aseptic Revision Knee or Hip Arthroplasty-Risk Factors and Impact on SurvivorshipRetrospective, Single CenterTHA
TKA		320
Table
Table 2. Follow-up and Intraoperative Sampling.
Table 2. Follow-up and Intraoperative Sampling.
Minimum Follow-Up
in Months		Follow-Up
in Months (Range)		Samples
n		Type of Samples
Barrack [33]2445 (24–74) 1min. 2synovial fluid, tissue
Milandt [44]12n/a *3–5tissue
Vargas-Reverón [47]60n/a *3–6synovial fluid, tissue
Hipfl [35]2468 (26–95) 1min. 3synovial fluid, tissue, sonication
Neufeld [25]1240 (18–77) 23–5swabs, synovial fluid, tissue
Neufeld [48]1243 (24–74) 23–5swabs, synovial fluid, tissue
Schwarze [24]2441 (25–31) 23–5tissue
1 Mean (Range), 2 Median (Interquartile Range), * n/a—information not available.
Table
Table 3. Preoperative Algorithm for PJI.
Table 3. Preoperative Algorithm for PJI.
AuthorPreoperative Algorithm
Barrack [33]In all cases: Clinical examination, plain radiographs, serum C-reactive protein (CRP), erythrocyte sedimentation rate (ESR)
Preoperative synovial fluid aspiration in 1 of 3 centers routinely and in 2 of 3 selectively
Milandt [44]n/a *
Vargas-Reverón [47]In all cases: Clinical examination, plain radiographs, serum CRP, ESR, bone scintigraphy
If suspicious: synovial fluid aspiration
Hipfl [35]In all cases: Clinical examination, plain radiographs, serum CRP
If suspicious: synovial fluid aspiration
Neufeld [25]In all cases: Clinical examination, plain radiographs, serum CRP, ESR
If suspicious: synovial fluid aspiration
Neufeld [48]In all cases: Clinical examination, plain radiographs, serum CRP, ESR
If suspicious: synovial fluid aspiration
Schwarze [24]In all cases: Clinical examination, plain radiographs, serum C-reactive protein (CRP), synovial fluid aspiration
* The preoperative workup was not reported in this registry-based study.
Table
Table 4. Included cases and UPCs.
Table 4. Included cases and UPCs.
Included Cases
n		UPC Total
n (% of All Cases)		Single UPC
n (% of All UPCs)		Most Frequent Isolated Pathogen (%)
Barrack [33]69241 (6)29 (71)ConS (49)
Milandt [44]2305282 (12)170 (60)ConS (67)
Vargas-Reverón [47]14548 (32)35 (73)ConS (96)
Hipfl [35]27477 (28)41 (53)ConS (42)
Neufeld [25]1196110 (9)74 (68) *C. acnes (38)
Neufeld [48]77576 (10)62 (82)C. acnes (32)
Schwarze [24]434160 (37)119 (74)ConS (43)
Total5821794 (14)530 (67)
* Information on the number of positive cultures was only available in 109/110 cases. C. acnes—Cutibacterium acnes.
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MDPI and ACS Style

Schwarze, J.; Moellenbeck, B.; Gosheger, G.; Puetzler, J.; Deventer, N.; Kalisch, T.; Schneider, K.N.; Klingebiel, S.; Theil, C. The Role of Single Positive Cultures in Presumed Aseptic Total Hip and Knee Revision Surgery—A Systematic Review of the Literature. Diagnostics 2023, 13, 1655. https://doi.org/10.3390/diagnostics13091655

AMA Style

Schwarze J, Moellenbeck B, Gosheger G, Puetzler J, Deventer N, Kalisch T, Schneider KN, Klingebiel S, Theil C. The Role of Single Positive Cultures in Presumed Aseptic Total Hip and Knee Revision Surgery—A Systematic Review of the Literature. Diagnostics. 2023; 13(9):1655. https://doi.org/10.3390/diagnostics13091655

Chicago/Turabian Style

Schwarze, Jan, Burkhard Moellenbeck, Georg Gosheger, Jan Puetzler, Niklas Deventer, Tobias Kalisch, Kristian Nikolaus Schneider, Sebastian Klingebiel, and Christoph Theil. 2023. "The Role of Single Positive Cultures in Presumed Aseptic Total Hip and Knee Revision Surgery—A Systematic Review of the Literature" Diagnostics 13, no. 9: 1655. https://doi.org/10.3390/diagnostics13091655

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