- Research article
- Open Access
- Open Peer Review
Does cemented or cementless single-stage exchange arthroplasty of chronic periprosthetic hip infections provide similar infection rates to a two-stage? A systematic review
BMC Infectious Diseasesvolume 16, Article number: 553 (2016)
The best surgical modality for treating chronic periprosthetic hip infections remains controversial, with a lack of randomised controlled studies. The aim of this systematic review is to compare the infection recurrence rate after a single-stage versus a two-stage exchange arthroplasty, and the rate of cemented versus cementless single-stage exchange arthroplasty for chronic periprosthetic hip infections.
We searched for eligible studies published up to December 2015. Full text or abstract in English were reviewed. We included studies reporting the infection recurrence rate as the outcome of interest following single- or two-stage exchange arthroplasty, or both, with a minimum follow-up of 12 months. Two reviewers independently abstracted data and appraised quality assessment.
After study selection, 90 observational studies were included. The majority of studies were focused on a two-stage hip exchange arthroplasty (65 %), 18 % on a single-stage exchange, and only a 17 % were comparative studies. There was no statistically significant difference between a single-stage versus a two-stage exchange in terms of recurrence of infection in controlled studies (pooled odds ratio of 1.37 [95 % CI = 0.68-2.74, I2 = 45.5 %]).
Similarly, the recurrence infection rate in cementless versus cemented single-stage hip exchanges failed to demonstrate a significant difference, due to the substantial heterogeneity among the studies.
Despite the methodological limitations and the heterogeneity between single cohorts studies, if we considered only the available controlled studies no superiority was demonstrated between a single- and two-stage exchange at a minimum of 12 months follow-up. The overalapping of confidence intervals related to single-stage cementless and cemented hip exchanges, showed no superiority of either technique.
There remains an ongoing discrepancy in the literature between the infection recurrence rates after a single-stage exchange arthroplasty compared to a two-stage exchange for chronic periprosthetic hip infections. Infection has been reported as the third reason for revision after total hip arthroplasty in the USA , complicating 0.5 to 2 % of primary arthroplasties [2–4].
The operative approach is determined by a combination of surgeon, patient, joint, and infection factors. Literature regarding the optimal inclusion and exclusion criteria for each modality is varied, but there is a general consensus that a two-stage exchange should be undertaken in patients with unknown pathogens or those of high-virulence [5–7].
Previous attempts at addressing this issue have been undertaken by various prospective [8–10] and retrospective cohort studies [11–13] comparing the modalities used, or systematic reviews [14, 15], but due to various limitations, such as determining the ‘ideal candidate’ for each treatment, a definitive conclusion has not been shown.
In the lack of large prospective, randomised controlled comparative trials, this comprehensive systematic review and meta-analysis of observational studies was undertaken to investigate the relative efficacy, in terms of recurrence of the infection, in a single- compared to two-stage exchange arthroplasty for chronic periprosthetic hip infection. A similar review has been recently reported for periprosthetic knee and shoulder infections [16, 17]. In addition, we aim to further analyse the infection rates after cemented and cementless single-stage exchanges, which have not been previously undertaken.
We searched for studies published up to December 2015 on the following databases: EMBASE; PubMed/Medline; Medline Daily Update; Medline In-Process and other non-indexed citations; Google Scholar; SCOPUS; CINAHL; Cochrane Central Register of Controlled Trials and Cochrane Database of Systematic Reviews; NHS Health Technology Assessment; http://www.google.com; and http://www.yahoo.com. The search was executed using MeSH and text keywords [see Appendix 1] and adapted for each database in order to achieve more sensitivity. Original study reports as well as review articles were retrieved, and the reference lists from all reviewed articles were assessed to complete the literature search. No language restrictions were applied.
We included studies that fuflilled the following inclusion criteria: (a) sample of at least 4 patients with prosthetic hip infection that underwent a surgical revision; (b) single-stage or two-stage exchange arthroplasty as surgical treatment; (c) a minimum follow-up of 12 months; (d) study reporting results relating to delayed or chronic infection (6 weeks or later) stages of disease; (e) recurrent infection after treatment as outcome; (f) study design classifiable as comparative study, prospective or retrospective study with no compared group.
Two investigators independently searched and reviewed the literature and classified the references in terms of whether they should be included on the basis of the title and abstract. In order to include all studies, if full text was not avaiable, abstracts with enough information to be qualitative and quantitative assessed were included. If more than one paper by the same author(s) was retrieved and their follow-ups were found to overlap, only the most recent reference with the longest follow-up and largest patient series was included. Discrepancies were solved by consusus.
Data collection was performed by four reviewers. The following data were extracted: name of author, year of publication, type of study design, minimum, maximum and mean period of follow up, number of patients included and number of recurrent infections (in case of comparative studies number of patients per group).
Our primary outcome was the recurrent infection rate. We chose to extract data only of patients who completed the single-stage or the two-stage revision. We did not include patients that had received a supplemental revision for a new infection following the prior septic revision, nor those who did not receive the complete reimplantation process, or died for cause unrelated to infection recurrence.
In order to reflect the information expected to be present in each included study, as a measure of quality we selected and evaluated the following two bias: (1) retrospective or prospective analysis and source of data (record bias); (2) relevance and definition of measured outcome for infection (reporting bias). Two independent reviewers performed the quality assessment; disagreements were resolved by consensus.
Infection recurrence rates were treated as dichotomous variables using the odds ratio (OR) for meta-analysis of controlled studies (single-stage versus two-stage) and the ratio between number of infection and total number of patients for proportional meta-analysis of cohort studies reporting only one treatment group, along with 95 % confidential intervals (CI).
The analysis was performed using extracted patient data from the individual studies. Because of the differences among the included studies and several uncontrolled variables, we used a random-effect model . The results from individual trials were combined when possible, but otherwise single forest plots will be reported without the overall duration of follow-up.
In single forest plot, each horizontal line on the graph represents a case series included in the meta-analysis. The estimated effect is marked with a solid black square, and the size of the square represents the weight of the corresponding study plotted in the meta-analysis. The combined total estimate is marked with an unfilled diamond at the bottom of the forest plot. Statistical heterogeneity was assessed using the I2 statistic and assume influential when the I2 was greater than 50 % and p < 0.05 as statistically significant for the calculation of heterogeneity; I2 illustrates the percentage of the variability in effect estimates resulting from clinical and/or methodological heterogeneity rather than sampling error [19, 20].
Forest plots were presented for the following interventions: single-stage, two-stage, single-stage cemented, and single-stage cementless hip arthroplasties. The presence of an overlap of the confidence intervals from the two interventions, for example between single-stage and two stage exchanges, suggests similar effect of the interventions on the outcome. Alternatively, non-overlapping CIs suggest different effects from the interventions studied .
We used the following software: StatsDirect [StatsDirect Ltd, Cheshire, UK] for the proportional meta-analyses and Review Manager [RevMan version 5.2, The Cochrane Collaboration, The Nordic Cochrane Centre, Copenhagen 2012] for meta-analyses in controlled studies.
Selection and characteristics of studies
The results of the study selection are shown in Fig. 1. We found 90 original observational studies. Sixteen studies reported the results only after a single-stage exchange, 59 reported only a two-stage hip exchange and 15 reported the comparison of a single-stage versus a two-stage. Overall, 31 original studies reported data about single-stage hip exchange arthroplasty (number of patients, n = 1608), which included 27 full text and 4 abstracts. Seventyfive studies reported on two-stage exchanges (n = 3679), of which 68 were full texts and 7 abstracts. Characteristics of the included studies are summarized in Table 1.
The number of patients undergoing a single-stage exchange ranged from 12 to 583, with a follow-up of 12 to 183 months. Considering a single-stage exchange performed with cementless implants (with or without antibiotic-loaded bone grafts) we found a total of 148 patients (mean follow-up: 78.1 months) whereas for single-stage exchange performed with cemented implant involved 1271 patients (mean follow-up: 78.1 months). The number of cases for only two-stage exchange studies ranged from 7 to 186, with a follow-up of 12 to 203 months.
The quality of included studies is shown in Table 1. Overall, 62 % of included studies were retrospective, 29 % prospective and 8 % were not definable because the full text was unavailable. Observational studies can produce high quality information but, given the nature of these study design, the lack of a control group and the likely confounding variables, the methodological quality was limited leading to difficult generalisation of results. The outcome was specified in the majority of the studies (84 %), selecting infection recurrence as the elective outcome to reflect the success of the two types of interventions. In the half of the included studies, the infection recurrence was diagnosed with more than two measurements (i.e. positive culture, clinical symptoms, imaging etc.). Nevertheless, a unique and universal definition of ‘hip periprosthetic infection’ was not adopted and among studies.
Concerning data reporting, only 57.3 % of the studies gave a description of their criteria for selecting either a single- or two-stage exchange arthroplasty. Other relevant variables such as the indication for primary hip arthroplasty or host type were poorly reported (49.0 % and 36.5 % respectively). Other variables, such as age (90.7 %), gender (86.4 %), isolated pathogen (91.6 %), duration of interim period between stages (88.6 %), implant type used at exchange arthroplasty (72 %), length of antibiotic therapy (76.3 %), number of patients lost to follow-up (73.8 %) were more often reported.
Single-stage vs two-stage
We have analysed the data using a random-effects model to incorporate the wide range of variables.
The mean pooled proportion of recurrent infection was 12 % (95 % CI = 8 %-17 %) in single-stage hip exchange (1608 cases, n = 31 studies) and demonstrated high clinical and methodological inconsistency between the studies included (I2 value = 80.3 %, p < 0.0001) (Fig. 2).
The mean pooled proportion of recurrence of infection was 9 % (95 % CI = 8 %-11 %) in two-stage hip exchange (3679 cases, n = 74 studies) and demonstrated moderate clinical and methodological inconsistency between the studies included (I2 value = 50.3 %, p < 0.0001) (Fig. 3).
The combined overlapped CIs from single- and two-stage exchanges suggests similar effect between the interventions, as represented in Fig. 4. This estimate was confirmed by the comparisons of the available controlled studies (n = 15): no statistically significant difference between people undertaking a single- versus a two-stage exchange in terms of recurrence of infection with a pooled odds ratio of 1.37 (95 % CI = 0.68-2.74, I2 = 45.5 %, p = 0.03) (Fig. 5).
Single-stage cementless vs single-stage cemented
The mean pooled proportion of infection recurrence in a single-stage hip cementless exchange (148 cases, n = 6 studies) was 14 % (95 % CI 4 %-28 %), whereas in a cemented exchange (1271 cases, n = 19 studies) it was 12 % (95 % CI 7 %-17 %). In both analyses a high clinical and methodological inconsistency was shown between the included studies (I2 value = 77.4 % for cementless and I2 value = 83.3 % for cemented; p < 0.0001).
Figures 6 and 7 present the pooled proportion for cementless and cemented hip exchanges. The combined overlapped 95 % CIs from cementless and cemented single-stage exchanges suggests similar effect between the interventions studied, as represented in Fig. 8.
This systematic review analyses the current published literature regarding a single- and two-staged exchange for hip periprosthetic infections, where the number of reported two-stage exchange arthroplasty studies largely exceeds that of a single-stage ones.
This study includes a much higher number of studies and patients compared to previous systematic reviews comparing both treatment options in a more limited population [14, 15] and is also, to our knowledge, the first attempt to investigate separately cemented and cementless one-stage revision procedures.
Our results failed to demonstrate a statistical difference between a single- and two-stage exchange arthroplasty, when applying a random effect model. Lange et al.  identified only a limited superiority of two-stage exchange arthroplasty in infection eradication, highlighting the low quality of available material, while Beswisk et al.  could not demonstrate any difference in eradication rates following a systematic review of studies with a minimum of 24 months of follow-up.
In line with these findings, when considering comparative studies only, the available material did not allow us to prove the superiority of single- or two-stage exchange arthroplasty, while a high heterogeneity of results was observed. As an example, Klouche and co-workers , recently reported no infection recurrence after single-stage exchange arthroplasty, even without using antibiotic-loaded cement, while Wolf et al.  demonstrated a 43 % infection recurrence rate after single-stage exchange, compared to only 4 % after two-stage revision. Further analysing their data, these authors provided evidence that the difference between the two treatments could be due to the better results obtained with a two-stage approach in more compromised hosts, while either seem to perform equally well, when normal hosts and early infections are involved .
Based upon the random-effects model used in our study, the rate of infection recurrence following a single-stage cementless exchange arthroplasty is not significantly different from single-stage cemented exchange. Once again, the limited number of studies and heterogeneity between both types, cemented and cementless, are worth considering.
More generally, the following limitations of the present study do apply. Patient selection and the eligibility for a single- or two-stage exchange arthroplasty may differ across centers; pathogen and host’s type, implant model and degree of bone loss, type of hip spacer, use and dose of local antibiotics, time interval between stages, post-operative systemic antibiotic treatment, definition of infection, diagnosis and surveillance protocols are all important variables [5, 11, 24–27] that were not reported uniformly across studies and were not considered in the present analysis.
A further limitation of this review concerns the study end-point, that we restricted to reporting infection recurrence, which limits the ability to catch differences in functional outcome, quality of life, or economical impact related to a given surgical option. In addition, we paid attention to the definition of measurements for recurrence of infection in order to investigate the “outcome reporting bias” but we were unable to distinguish between recurrent and new infections, as such a distinction was not made in the majority of the studies. The conventional definition of a ‘new’ infection is the isolation of a new microorganism, as opposed to the detection of the same pathogen in ‘recurrent’ infections, however we feel such a differentiation is unreliable. The microbiological results following periprosthetic samples are too unpredictable, especially after previous antibiotic treatment. The criteria for differentiating between recurrent and new infections is weakly supported in the literature, and somewhat artificial .
Classifing the design of included studies in order to judge their quality and internal validity was difficult. In fact, for an important part of studies the design assigned was unclear, and considering the inclusion of a paper or abstract published only in English we had an additional limit.
We found a substantial presence of the “record bias” for the majority of studies. Out of the 90 studies included, only 15 studies had a controlled group. The lack of a control group, and the prospective collection of data according to a protocol established before the beginning of the study, can affect the methodological quality limiting the external validity of findings.
We call for the need of large, multi-center randomised controlled trials with higher quality assessment in order to establish the superiority of one type of surgical treatment over another. However, certain circumstantial limitations such as the low incidence of the disease, relatively small patient cohorts, need for long-term follow-up, and variations in microorganisms and patients’ co-morbidities, would also make a large controlled prospective study in this field extremely challenging.
No superiority was seen for a two-stage exchange arthroplasty over that of a single-stage for chronic periprosthetic hip infections, nor a statistical difference between cemented and cementless single-stage exchanges. This may reflect the shear complexity of this patient cohort and the difficulty in finding the true answer, and further reiterates that the ultimate choice of treatment modality depends on a variety of parameters not addressed in this review. This should include the patient’s preoperative clinical status, potential benefits in function and quality of life to be gained from treatment, its economical implications, and complication rates.
number of patients
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The authors declare that there was no funding associated with the manuscript.
Availability of data and materials
All the data supporting our findings are contained within the manuscript.
DG: participated in the conception and design of the study, acquisition of data, interpreted the data, drafted the manuscript. NL: involved in the acquisition and interpretation of the data. GC and SG: participated in the acquisition of data, critically appraised and analysed the data, drafted the manuscript. SS and LD: involved in the acquisition and interpretation of the data. FSH: jointly conceived the study, participated in its design and interpreted the data. CLR: conceived the study, participated in its design, involved in the acquisition and interpreted of the data, drafted the manuscript and was overall coordinator. All authors read and approved the final manuscript.
The authors declare that they have no competing interests.
Consent for publication
Ethics approval and consent to participate
No ethical approval was sought as it was deemed unneccesary for this meta-analysis.
Keywords entered either alone or in a variety of combinations during the systematic review process.
- Total hip replacement:
- Prosthetic hip infection:
Periprosthetic hip infection
- Exchange arthroplasty: