The effect of Nickel hypersensitivity on the outcome of total knee arthroplasty and the value of skin patch testing: a systematic review
Arthroplasty volume 4, Article number: 40 (2022)
To assess the Nickel sensitizing potential of total knee arthroplasty (TKA), explore the relationship between hypersensitivity and clinical outcomes, and evaluate the utility of skin patch testing pre- and/or postoperatively.
Materials and methods
A literature search was performed through EMBASE, Medline and PubMed databases. Articles were screened independently by two investigators. The level of evidence of studies was assessed using the Oxford Centre for Evidence-Based Medicine Criteria and the quality evaluated using the Methodological Index for Non-randomized Studies and Cochrane risk-of-bias tools.
Twenty studies met the eligibility criteria, reporting on 1354 knee arthroplasties. Studies included patients undergoing primary or revision TKA, pre- and/or postoperatively, and used patch testing to identify Nickel hypersensitivity. Prevalence of Nickel hypersensitivity ranged from 0% to 87.5%. One study compared the prevalence of Nickel hypersensitivity in the same patient group before and after surgery and noted newly positive patch test reactions in three patients (4.2%). Three studies reported lower prevalence of Nickel hypersensitivity in postoperative patients compared to preoperative ones. Seven studies suggested that hypersensitivity might cause adverse clinical outcomes, but six did not support any relationship. Seven studies recommended preoperative patch testing in patients with history of metal allergy, and nine concluded that testing may be valuable postoperatively.
Patients undergoing TKA with no prior history of metal hypersensitivity do not seem to be at an increased risk of developing Nickel hypersensitivity, and there is conflicting evidence that patients with pre-existing hypersensitivity are more likely to experience adverse outcomes. Patch testing remains the most commonly used method for diagnosing hypersensitivity, and evidence suggests preoperative testing in patients with history of metal allergy to aid prosthesis selection, and postoperatively in patients with suspected hypersensitivity once common causes of implant failure have been excluded, since revision with hypoallergenic implants may alleviate symptoms.
The reported prevalence of metal hypersensitivity in the general population ranges from 10 to 15% . Nickel hypersensitivity is the most common, followed by Chromium and Cobalt, with approximately 14% of the general population having cutaneous sensitivity to Nickel . The prevalence is reported to be four times more prevalent in females  and in certain occupations such as hairdressing, catering and bar work [3, 4]. Total knee arthroplasty (TKA) implants are typically composed of Nickel, Cobalt, Chromium, Molybdenum, Zirconium and Titanium alloys , and it has been suggested that patients could develop hypersensitivity reactions to these metals and associated complications postoperatively . In total hip arthroplasty (THA), the prevalence of metal hypersensitivity has been reported to be approximately 25% in patients with well-functioning implants and up to 60% in those with failed or poorly functioning implants . Similarly, the reported prevalence of metal hypersensitivity in TKA patients with stable implants is 44%, and 57% in those with loosened implants . However, it remains uncertain whether the relationship between sensitization and implant failure is cause or effect.
Patients with metal hypersensitivity can present in a similar way to joint infection [1, 8]. Symptoms may include persistent pain, swelling and stiffness, with the onset of symptoms occurring between 2 months and 2 years following primary TKA [1, 9]. The patient may develop localized dermatitis, effusions, and reduced range of motion [8, 10]. More generalized eczematous reactions, though less common, can occur . Radiography is typically unremarkable but might demonstrate periprosthetic osteolysis or implant loosening .
Metal hypersensitivity is a diagnosis of exclusion once more common causes of implant failure, such as infection and aseptic loosening, have been ruled out [10, 13]. Currently, there is no established or reliable test for detecting metal hypersensitivity, although skin patch testing (PT) is often employed due to ease of application, widespread availability, breadth of evaluation, and rapidity of results [9, 10, 14]. However, there is a lack of consensus over the clinical utility of patch testing patients with TKA [6, 10].
Since metal hypersensitivity occurs most frequently from exposure to Nickel, this systematic review was performed to collate and analyze the current literature on Nickel hypersensitivity in patients undergoing TKA. Previous review articles [1, 5, 6, 9, 10, 13,14,15,16,17,18,19] have been published providing an overview of metal hypersensitivity in total joint arthroplasty, but the current review focuses specifically on Nickel hypersensitivity in TKA patients as well as the usefulness of patch testing. The aims of the study were to evaluate: (1) the Nickel sensitizing potential of TKA, (2) the relationship between Nickel hypersensitivity and clinical outcomes and (3) the utility of skin patch testing in TKA patients pre- and/or postoperatively.
Materials and methods
This review was conducted in accordance with the 2020 Preferred Reporting Items for Systematic Review and Meta-Analysis (PRISMA) guidelines .
Clinical studies determining the prevalence of Nickel hypersensitivity by patch testing patients with total knee arthroplasty, pre- and/or postoperatively, were included. Studies which also involved patients undergoing orthopedic interventions other than TKA were not excluded, provided that an appropriate number of TKA patients were included. Full-text articles had to be available and published in English or with translation freely available. Case reports, review articles, conference abstracts and surveys were excluded.
A comprehensive electronic search strategy utilizing a combination of Medical Subject Heading (MeSH)-terms and keywords was developed by one author (CP) and refined with the help of the Department Librarian (PA). The EMBASE and Medline databases were searched using the Healthcare Database Advance Search (HDAS) platform and extended to the native PubMed database, identifying literature from inception until September 2021. The line-by-line strategy run in HDAS and PubMed is outlined in Supplementary Material 1 and Supplementary Material 2, respectively. The only limitation to the search strategy was the ‘search field’, restricted to title and abstract, ensuring the literature search was sensitive and yielded all articles meeting the eligibility criteria.
To supplement the electronic search, a detailed review of the reference lists of the final studies included in the systematic review and in review articles on the same or similar topic was performed. Finally, a search of the grey literature on OpenGrey was performed to identify any published or ongoing research.
Potentially eligible studies were identified by screening the titles and abstracts of all articles retrieved from the search. The eligibility of each full-text article was then assessed for inclusion. Each stage was performed independently by two investigators (CP, HF), and any inconsistencies were discussed until consensus obtained. Disagreements at either stage were resolved by the senior author (DHS).
The following data were extracted from the included studies:
Study characteristics (e.g. author, year, country, etc.)
Patient characteristics (e.g. sample size, average age, percentage of females etc.)
Type of TKA implant (i.e. metallic composition)
Details of patch testing (i.e. composition, timing)
Prevalence of Nickel hypersensitivity (i.e. number of patients, percentage of population)
Relevant clinical results (e.g. complications, implant status, further management etc.)
Main conclusions and recommendations
A data collection table in Microsoft Excel was designed by one author (CP) to display the information extracted from each eligible study.
Owing to heterogeneity in study design, participants, interventions and outcome measures, a quantitative meta-analysis was not appropriate.
Methodological quality assessment
Levels of evidence (LE) were assessed using the Oxford Centre for Evidence-Based Medicine (OCEBM) framework .
The quality of observational studies was independently assessed by two authors (CP, HF) using the Methodological Index for Non-randomized Studies (MINORS) tool . The ideal global score was 16 for non-comparative studies and 24 for comparative studies.
Any randomized controlled trials were scored using the revised Cochrane risk-of-bias tool for randomized trials (RoB 2) .
The assessments provided an overall impression of each study but were not used to weight any studies in the analysis.
The initial search performed through the EMBASE, Medline and PubMed databases identified 4002 records, of which 1695 records remained after deduplication. Of these, 1666 were excluded after screening titles and abstracts. Eight additional studies were identified by searching the reference lists of articles on the same topic, and no studies were identified by performing a search of the grey literature. As a result, 37 full-text articles were assessed for eligibility for inclusion, of which 17 were excluded (Fig. 1). Twenty studies were deemed eligible for inclusion in the review.
Nineteen observational studies were included, four having a cohort study design with LE of III [24,25,26,27], and 15 being either case-control or case-series, with LE of IV [7, 28,29,30,31,32,33,34,35,36,37,38,39,40,41]. The average MINORS score was 9.75 and 14.29 for non-comparative and comparative observational studies respectively. There was one randomized-controlled trial (RCT) with LE of II  (Table 1).
Details of the characteristics of each individual study are shown in Table 2.
The 20 studies included a total of 1354 TKAs, with an average of 68 knees per study. Amongst the studies which provided the mean age of all the participants involved (three studies with missing data [25, 26, 28]), the average age was 63.1 years (range, 11–96). The average proportion of females was 70% (two studies with missing data [25, 28]).
All patients underwent primary or revision TKA, with the other study participants comprising either control groups (e.g. no implant) or undergoing a different surgical procedure, such as THA. Fifteen studies [7, 25, 26, 30,31,32,33, 35,36,37,38,39,40,41,42] recorded the type of TKA implant used, with 13 noting the metallic composition of the prosthesis [7, 25, 26, 30,31,32,33, 35,36,37,38,39, 42]. The remaining five studies did not clearly document the type of implant used [24, 27,28,29, 34]. The characteristics of each individual patient group, including sample size, mean age, percentage of females, and implant type, are outlined in Table 3.
All 20 studies used patch testing to identify metal hypersensitivity. Details, including the composition and timing of testing in each study, are outlined in Table 4. The substances applied in the patch test, including the precise concentration of Nickel antigen, were documented in 18 studies (Table 4). Thirteen studies used Nickel Sulphate 5% [7, 25,26,27,28,29,30, 32, 36, 38,39,40, 42], one used Nickel Sulphate 2.5% , and two used both 2.5% and 5% [24, 34]. Three studies did not record the concentration of Nickel Sulphate used [35, 37, 41], while one did not document any of the substances used .
In four studies [26, 27, 30, 42], the same group of participants underwent patch testing before and after surgery. Four studies [7, 24, 28, 34] performed patch testing on one cohort of patients preoperatively and on a different cohort postoperatively. In ten studies [25, 29, 31, 33, 35,36,37,38,39,40], patients were patch tested only postoperatively, whilst in two [32, 41] patch testing was performed only preoperatively. The reported time until patch testing was performed postoperatively ranged from 3 months  to 16 years , but five studies [34,35,36,37, 39] did not record when the postoperative patch testing was performed.
Prevalence of Nickel hypersensitivity
The prevalence of Nickel hypersensitivity in the individual populations of each study together with relevant clinical outcomes, such as complications, implant status, and further management, is summarized in Table 5. The prevalence of Nickel hypersensitivity across the studied populations ranged from 0% [7, 26, 37] to 87.5% . Four studies [26, 27, 30, 42] analyzed the prevalence in the same patient group before and after surgery. One study  noted that three patients (4.2%) who tested negative initially developed a newly positive reaction to Nickel after their operation. One study  noted that no patients had developed a newly positive reaction compared to their preoperative baseline. One study  did not record a significant increase in prevalence following surgery and another  noted that two patients had developed ‘doubtful’ patch test reactions.
Four studies [7, 24, 28, 34] compared the prevalence in different patient groups pre- and postoperatively, and in three of these [24, 28, 34], a lower prevalence was noted in the postoperative cohort. Compared to a control group comprising patients without implants, one study  reported a lower prevalence of Nickel hypersensitivity in patients with stable TKA, but a higher prevalence in patients with loosened TKA. Ten studies [25, 29, 31, 33, 35,36,37,38,39,40] performed patch testing only postoperatively and the prevalence ranged from 7.7%  to 83.3% .
Study conclusions and recommendations
Three main themes were commented on: the sensitizing potential of TKA, the relationship between metal hypersensitivity and adverse clinical outcomes, and the utility of patch testing, with the main conclusions summarized in Table 6.
Nickel hypersensitivity and the implications on TKA is a controversial topic. This systematic review analyses the literature specifically focusing on Nickel hypersensitivity in patients undergoing TKA in order to assess the sensitising potential of TKA, the relationship with clinical outcomes, and the utility of skin patch testing.
Sensitizing potential of TKA
There was limited evidence to support the concept that implants used in TKA can elicit Nickel hypersensitivity in patients with no prior history of metal hypersensitivity. Only one study  which analyzed the prevalence of Nickel hypersensitivity in the same patient group before and after surgery noted that patients developed a newly positive reaction to Nickel after surgery, and this occurred in only three out of the 72 patients available for follow-up (4.2%). The other studies [26, 27, 42] which followed patients up after surgery did not find a significant increase in prevalence of Nickel hypersensitivity following operation, and three studies in the review [24, 28, 34] noted that Nickel hypersensitivity was in fact lower in postoperative patients with implants compared to preoperative patients without implants. Based on the evidence available, TKA implants do not appear to contribute to the development of Nickel hypersensitivity in patients with no prior history of metal allergy.
Nickel hypersensitivity and clinical outcomes
The literature evaluating the relationship between Nickel hypersensitivity and clinical outcomes was conflicting. Some studies in the review noted that patients with a positive patch test result to a metallic component of their implant developed eczema , joint loosening , recurrent pain [24, 27], and swelling . They were also more likely to be dissatisfied , and a higher prevalence of Nickel hypersensitivity was reported in TKA patients with complications compared to those without [7, 37]. It is conceivable that these symptoms could have been attributable to hypersensitivity, since patients who subsequently had their prosthesis removed, or revised with hypoallergenic implants, experienced resolution of symptoms, whereas those who did not remained symptomatic [24, 28, 34, 35].
Given that up to 20% of patients are not satisfied with the outcome of TKA due to multifactorial reasons , it is difficult to ascribe these symptoms to Nickel hypersensitivity alone. Carlsson and Möller  followed patients with established preoperative metal allergy up to 16 years after implanting prostheses containing metal to which they were allergic and reported no dermatological or orthopedic complications attributable to contact allergy. Their findings are consistent with other studies which found no significant association between hypersensitivity and pain  or radiographic loosening [7, 40]. Furthermore, although Verma et al  noted that some patients with a positive patch test developed eczema lateral to the surgical incision, they were unable to correlate their findings, and there is evidence that cutaneous eruptions at this site can develop as a result of resection of the infrapatellar branch of the saphenous nerve when utilizing a medial parapatellar approach [44,45,46].
The literature did not support the routine use of preoperative patch testing in all patients undergoing TKA. The majority of studies which commented on the utility of preoperative testing [24, 26, 28, 31,32,33,34] suggested that surgeons should consider the overall clinical context, performing patch testing only in patients with a history of metal hypersensitivity, with Granchi et al.  reporting that TKA failure was four times more likely in this cohort of patients.
The use of a diagnostic algorithm for metal hypersensitivity in patients undergoing TKA has been proposed in previous articles [6, 9, 14, 15] (Fig. 2). Patients with a positive history of metal hypersensitivity, confirmed with a positive patch test, should be assumed to be hypersensitive to metal and the use of hypoallergenic implants should be considered.
Hypoallergenic TKA implants include coated implants (with Titanium Nitride or Zirconia Nitride), ceramic implants (oxidized Zirconium), pure Titanium implants, and all-polyethylene tibial components [19, 47]. Satisfactory short-to-medium-term outcomes have been demonstrated with these implants. However concerns exist over their longevity and clinical performance , so appropriate informed consent should be obtained and shared decision-making should be undertaken.
The evidence suggests that patch testing could be a valuable diagnostic tool postoperatively to screen for metal hypersensitivity in symptomatic patients following TKA. In patients presenting with recent onset of periprosthetic dermatitis, arthralgia, evidence of loosening, or radiolucent lines on radiographs, patch testing seems a reasonable option once other failure mechanisms such as infection, instability and malalignment have been excluded and inflammatory markers (CRP and ESR) and joint aspiration have yielded negative results [6, 14]. A treatment algorithm could be employed to assist with the management of such patients (Fig. 3). Patients with a positive patch test may have their symptoms treated medically (e.g. with topical steroids or NSAIDs ) or consider undergoing revision with a hypoallergenic implant. This should again involve discussion, shared decision-making and appropriate consenting.
Lymphocyte transformation testing (LTT) was performed in addition to patch testing in a number of studies included in the review [26, 28, 30,31,32,33, 35, 37, 41]. LTT detects metal hypersensitivity by measuring the ratio of lymphocyte proliferation in peripheral blood (that has been incubated for seven days) with an antigen present over lymphocyte proliferation with the antigen absent, which is referred to as the stimulation index [10, 48]. It has been suggested that LTT might be more suitable than patch testing as it is more sensitive, less subjective, and patch testing itself can induce metal hypersensitivity in previously non-sensitive patients [26, 28]. However, there are limitations to its large-scale application including cost [29, 42] and the need for specialized laboratories . The role of LTT remains unclear but appears to be gaining support for its use in conjunction with PT when results are negative and allergy remains strongly suspected . Taking synovial biopsies for histopathological analysis of adverse local tissue reactions to implant materials may further assist with diagnosis .
Patch testing remains the most commonly used investigation for diagnosing metal hypersensitivity [9, 14, 49]. It is simple, inexpensive, widely available, and may allow for screening of several metals [10, 48] but debate remains over the correlation between dermal reactions elicited by skin patch testing and deep-tissue sensitivity surrounding an implant . Since the primary antigen-presenting cells responsible for contact dermatitis and implant-related hypersensitivity differ [10, 16], it is uncertain whether PT can reliably predict outcomes associated with total knee arthroplasty .
This systematic review has several limitations. Firstly, all the included studies had low levels of evidence, with only one  scoring above III, based on the OCEBM. In addition, the quality of the studies was poor; none of the observational studies achieving an ideal global MINORS score and the only RCT  demonstrating a high risk of bias when assessed using the RoB 2 tool. Caution should therefore be exercised when interpreting and comparing the results of these studies.
Several of the articles analyzed groups of patients undergoing not only knee, but also other orthopedic interventions [24, 27, 30, 31, 34, 36, 37, 41], such as hip and shoulder arthroplasty. However, the results of patch testing in those participants were not stratified by operation, but only as a single patient cohort [24, 25, 27, 30, 31, 34, 36, 37, 50]. Given that specific types of implants, such as metal-on-metal hip prostheses, have a greater propensity to release metal ions and potentially induce hypersensitivity , or loosening as the result of a different mechanism from allergy , it is difficult to interpret the relationship between Nickel hypersensitivity and total knee arthroplasty in this context.
The utility of late patch test reading at day six after application has been documented  and it is possible that many of the studies which interpreted patch tests at day two or three might have missed late positive reactions or been interpreted as false-negative readings. The time until patch testing was performed postoperatively was also highly variable across the studies, and it is thought that shorter periods (e.g. six months) may be insufficient to detect new hypersensitivity reactions to implant components .
The current literature does not support the concept that patients undergoing TKA with no prior history of Nickel hypersensitivity are at an increased risk of developing hypersensitivity, and there is conflicting evidence that patients with established Nickel hypersensitivity are more likely to experience dermatological or orthopedic complications such as persistent pain, implant loosening or failure. Despite its limitations, cutaneous patch testing remains the most commonly used method for diagnosing Nickel hypersensitivity. The literature does not support routine patch testing of patients prior to TKA but does support performing this test in patients with a history of metal hypersensitivity. In those with a positive patch test, the choice of implant to use should be made on a case-by-case basis after discussion with the patient, as in the absence of more robust evidence, the careful selection of which device to implant may minimize the potential risk of complications related to metal hypersensitivity. Patients with a clinical presentation suggestive of Nickel hypersensitivity following TKA may benefit from patch testing only after the more common causes of pain, loosening and failure have been excluded, since revision surgery with hypoallergenic implants may alleviate symptoms. To further establish the relationship and importance of Nickel hypersensitivity in patients undergoing TKA, large-scale, appropriately designed studies will be required.
Availability of data and materials
All available data are provided. Additional data, if needed, may be made available from the corresponding author on reasonable request.
Total knee arthroplasty
Total hip arthroplasty
Preferred Reporting Items for Systematic Review and Meta-Analysis
Medical Subject Heading
Healthcare Database Advance Search
Levels of Evidence
Oxford Centre for Evidence-Based Medicine
Methodological Index for Non-Randomized Studies
Risk of bias
Erythrocyte sedimentation rate
Lymphocyte transformation testing
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The authors would like to thank Ms. Irrum Afzal, Research Manager at the Academic Surgical Unit of the South West London Elective Orthopedic Centre (SWLEOC), for her guidance and contribution to the research process behind this systematic review. We are also grateful to Ms. Potenza Atiogbe, Multiprofessional Education and Library Services Manager at Epsom and St Helier’s NHS Trust, for her support and help in searching the literature and obtaining some of the publications used in this work.
This research did not receive any specific grant from any funding agencies in the public, commercial, or not-for-profit sectors.
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Peacock, C.J.H., Fu, H., Asopa, V. et al. The effect of Nickel hypersensitivity on the outcome of total knee arthroplasty and the value of skin patch testing: a systematic review. Arthroplasty 4, 40 (2022). https://doi.org/10.1186/s42836-022-00144-5
- Nickel hypersensitivity
- Total knee arthroplasty
- Total knee replacement
- Patch testing