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Accumulation of blood chromium and cobalt in the participants with metal objects: findings from the 2015 to 2018 National Health and Nutrition Examination Survey (NHANES)

BMC Geriatrics volume 23, Article number: 72 (2023) Cite this article

Abstract

Background

Chromium (Cr) and cobalt (Co) are the essential elements for producing metal implants, but might have potential health issues. The research on the correlation between metal implants and blood Cr and Co on a large population is still limited.

Methods

National Health and Nutrition Examination Survey (NHANES) is a program of studies designed to assess the health status of Americans began in the early 1960s. The study was based on the NHANES database from two data collection years (2015–2016 and 2017–2018). The exposure variable of this study was whether the participants had metal objects in the body or not. The outcome variables were blood concentrations of Cr and Co. Age, body mass index, sex, race/ethnicity, income to poverty ratio, tap water behavior, shellfish/fish/tuna/salmon eating habits, level of education, smoking behavior, marital status, blood hemoglobin, and data collection years were included as confounding variables.

Results

A total of 4412 participants, aged 40 years or older, were included in this analysis, consisting of the without metal objects group (n = 3150) and the metal objects group (n = 1262). Metal objects was positively correlated to the accumulation of blood Cr (β = 0.072, 95% CI: 0.043–0.102, p < 0.001) and blood Co (β = 0.079, 95% CI: 0.049–0.109, p < 0.001). However, the positive correlation of metal objects with blood Cr was only presented in women (β = 0.112, 95% CI: 0.074–0.151, p < 0.001), but not in men. Meanwhile, the positive relationship between metal objects and blood Cr/Co was not observed in the Asian subgroup.

Conclusions

Blood Cr and Co concentrations were statistically higher in people with metal objects, but with race and sex differences.

Level of Evidence

Level IV, cross-sectional study

Peer Review reports

Introduction

Metal objects such as artificial joints, pins, plates, or metal suture material are mainly considered treatment options for orthopedic diseases, including osteoarthritis [1, 2], fracture [3, 4], bone tumor [5], and others [6]. For orthopedics, as one of the ordinary metal objects, the artificial joint is to diminish pain, correct deformity, restore function, and improve patients’ quality of life. However, patients’ or their families’ concerns about the adverse effects of those implants have been raised for the possible accumulation of metal ions in the blood.

Humans can be exposed to metals in various ways. Drinking water and eating foods such as fish, smoking, geographical environment, and occupational exposures have been suspected as sources of heavy metals [7,8,9]. Chromium (Cr) and cobalt (Co) are the essential elements for producing metal implants, but might have potential health issues. One study based on 100 patients with metal implants has shown that serum Co ion level was elevated after metal-on-metal total hip arthroplasty [10]. A recent study on 51 patients also reported a relationship between increased serum Cr and Co levels and spinal implants [11]. The literature review based on 43 studies indicated blood concentration of Cr ranged between 0.5 and 2.5 μg/L, and Co ranged from 0.7 to 3.4 μg/L among those patients exposed to metal-on-metal implants [12,13,14] Meanwhile, percutaneous coronary intervention with Co-Cr coronary stents does not cause serum Cr and Co concentrations elevation based on 20 patients [6]. The controversial results might be due to the limitation of the sample size, so the research on the effect of metal implants on a large population is still needed.

Fortunately, the extensive data capabilities with thousands of participants in the United States National Health and Nutrition Examination Survey (NHANES) database resolve the data acquisition difficulty. Therefore, this study aimed to reveal the association between metal implants and the blood Co or Cr level (Co/Cr) in the population with different race/ethnicity and sex from NHANES. It was hypothesized that the blood Co/Cr in the participants with metal implants were significantly higher than those without metal implants.

Materials and methods

Study population

The study population was based on the two data collection years of the NHANES database from 2015–2016 and 2017–2018 (Fig. 1). After exclusion of participants with missing metal objects information (n = 13,203), participants with pregnancy (n = 6), participants with missing body mass index (BMI) (n = 76), and participants with missing blood Cr/Co data (n = 1527), a total of 4412 participants were included in this analysis. Approval of this study was obtained from the ethics review board of the National Center for Health Statistics, and written consent was obtained from every participant.

Fig. 1
figure 1

Flow chart of sample selection from the NHANES 2015–2018

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Variables

The exposure variable of this study was the participants with metal objects or not. Newly released in the data collection years of 2015–2016, the NHANES contained the question “Any metal objects inside your body?” in the Medical Conditions Data of the Questionnaire Data section (https://wwwn.cdc.gov/Nchs/Nhanes/2015-2016/MCQ_I.htm). The definition of metal objects in the question contained any artificial joints, pins, plates, metal suture material, or other types of metal objects in the body. The metal object should not be visible on the outside of the body or in the mouth. The interviewers aged 40 years and older were eligible to answer yes or no.

The outcome variable was the whole blood concentrations (ug/L) of Cr and Co, measured using inductively coupled plasma mass spectrometry [15]. The detailed description of the laboratory methods was noted in the Laboratory Method Files section (https://wwwn.cdc.gov/Nchs/Nhanes/2015-2016/CRCO_I.htm).

The following categorical variables were included in this analysis: sex (male or female), race/ethnicity, income to poverty ratio, tap water behavior, shellfish/fish/tuna/salmon eating habits, level of education, smoking behavior, marital status, and data collection years. In addition, the continuous covariates were also included: age, BMI, and blood hemoglobin. The detailed definitions of the covariates are available at https://wwwn.cdc.gov/nchs/nhanes/. Those confounders were evaluated using prior knowledge [16,17,18,19] and descriptive statistics from our cohort through the use of directed acyclic graphs (Supplement Fig. 1).

Statistical analysis

The weighted χ2 test for categorical variables or linear regression model for continuous variables were applied to calculate the difference between the groups with or without metal objects. A multivariate linear regression model was applied to evaluate the association between metal objects and blood Cr/Co. The subgroup analysis was performed by stratified multivariate regression analysis. Furthermore, to detect trends, smooth curve fittings were used to address the relationship between age/BMI and blood Cr/Co in different groups. All analyses were performed with EmpowerStats software (version 3.0, X&Y Solutions, Boston, MA, USA) and the R Project for Statistical Computing (version 3.2.3, R Core Team), and p < 0.05 was deemed statistically significant. The R code of the modified ggplot2 package to draw smooth fitting curves was attached in the Supplement file 1.

Results

A total of 4412 participants, aged 40 years or older, were included in this analysis, consisting of the without metal objects group (n = 3150) and with metal objects group (n = 1262), as shown in Table 1. There were statistically significant differences in baseline characteristics between the groups, except the BMI, income to poverty ratio, blood hemoglobin, data collection years, marital status (Table 1 and Supplement Table 1). Compared to the group without metal objects, participants were more likely to be older, Whites, smoke ≥ 100 cigarettes, drink tap water, and eat shellfish, fish, tuna, or salmon. 74.8% of participants with metal objects are non-Hispanic White, but the incidence is only 63.6% in the group with metal objects.

The results of the multivariate regression analyses were presented in Table 2. In the unadjusted model, metal objects were positively correlated to blood Cr accumulation (β = 0.074, 95% CI: 0.046–0.102, p < 0.001). After adjustment for confounders, this positive association was still present in minimally adjusted model (β = 0.076, 95% CI: 0.047–0.105, p < 0.001) and fully adjusted model (β = 0.072, 95% CI: 0.043–0.102, p < 0.001). Meanwhile, metal objects were positively correlated to the blood Co accumulation in all three models. Individuals with metal objects had a 0.079 ug/L greater blood Co than those without metal objects (Table 2).

On subgroup analyses, stratified by sex, reported in Table 3, the positive correlation of metal objects with blood Cr was only presented in women (β = 0.112, 95% CI: 0.074–0.151, p < 0.001), but not in men. The positive correlation of metal objects with blood Co remained in both men (β = 0.102, 95% CI: 0.069–0.136, p < 0.001) and women (β = 0.054, 95% CI: 0.005–0.103, p = 0.031). As reported in Table 4, stratified by race/ethnicity, the positive relationship between metal objects and blood Cr was not observed in the Asian subgroup. Meanwhile, the positive relationship between metal objects and blood Co was not observed in the Asian and Hispanic subgroups.

Smooth curve fittings are shown in Fig. 2. Among participants with metal objects, a wave-shaped curve (Fig. 2a) was observed; senior citizens would have significantly higher blood Co (p = 0.008) but no association with blood Cr (p = 0.474). Among participants without metal objects, no association between age and blood Cr (p = 0.508) or Co (p = 0.269), although U-shaped curves (Fig. 2b) were observed.

Fig. 2
figure 2

Smooth curve fittings between age and blood Cr (a) and Co (b) in different groups

Full size image

Discussion

This article used the NHANES database to explain the relationship between metal implants and concentrations of blood Cr and Co ions in a United States population surveyed between 2015 and 2018 through regression analysis, in an attempt to answer one of the most common questions doctors face with their patients: Doctor, will I have heavy metal poisoning from this implant? It is suggested that the presence of implant does cause the increase of blood ion concentration in the human body, but the concentration is far lower than the toxicological dose (Supplement Fig. 2). Based on Hart et al., [20] the acceptable upper limits of 2.56 μg/L for Cr and 2.02 μg/L for Co in whole blood have been proposed. However, based on different articles, the reference value varies. Another article [21] indicated that the concentration of Cr and Co in whole blood should be lower than 2.8 μg/L and 1.6 μg/L, respectively.

Prior to this, many studies focused on implant ion release. The release of ions in total hip arthroplasty mechanically assisted crevice corrosion is always a focus of attention [22,23,24]. However, most studies tend to focus on changes in metals such as titanium (Ti) and lead or other ions [25, 26]. Together, metal ion studies using the NHANES database are not primarily concerned with metal implants [27,28,29]. The traditional metal-on-metal hip implant contained the Co-Cr liner and the Ti shell. The modular junction between them (Co-Cr/Ti junction) has raised concerns over the corrosion potential at the dissimilar metal interface. Co-Cr/Ti junctions create more metal chips during wear and tear that can be absorbed by surrounding tissues, either deposited in the tissues or released into the blood [30,31,32,33].

Meanwhile, analysis of micronutrients in pregnant women revealed the accumulation of Co ions in pregnant women and analyzed its possible proportional relationship with vitamin B12 intake and smoking [34]. Tvermoes et al. and Chen et al. found that female adults had higher Co levels than male adults [35, 36]. However, this study showed that men were more likely than women to accumulate Co in the body. The controversy might be the difference between the studies with different confounders and follow-up times.

In addition, from the results of the stratified analysis, we can infer that there are racial differences in the accumulation of Cr in the body. Whites are the most likely to accumulate Cr, followed by African-American, followed by Hispanics, and Asian people are not easy to accumulate Cr. Similarly, Whites were most likely to accumulate Co, followed by African-American, and Asian and Hispanic people were not easy to accumulate Co. This paper combined the content of metal ions in the body with race analysis, and the mechanism may be related to the differences in genes related to metabolism between races, [37, 38] which requires further research. However, the lack of significance might due to restricted samples of Asians.

This study also noticed a distinct difference in the concentration of Cr and Co ions, which might be related to the distribution pattern of the two ions in tissues. It was found that Co was selectively leached from the alloy and released into the blood during plant corrosion. The free Cr released due to corrosion precipitated in local tissues as Cr phosphate, but did not form organometallic complexes in serum [39,40,41,42,43]. However, other studies have shown that Cr released from hip implants is preferentially distributed into serum, not red blood cells. Thus, the form of the Cr in the blood of these patients is in the non-toxic trivalent state, which is considered an essential nutrient [44]. At the same time, the serum metal ions can distinguish between patients with internal plant corrosion and patients without corrosion [45]. Taper junction corrosion and fretting, also known as mechanically assisted crevice corrosion, produces Co and Cr ions, fretting products, and corrosion debris, which may cause adverse local tissue reactions. And Cr and Co levels may help determine mechanically assisted crevice corrosion in a particular joint, and significantly elevated levels may explain symptoms, but not significantly elevated serum values [46,47,48].

What’s more, Co is part of vitamin B12, an indispensable heavy metal in the body. Studies have shown that Co can increase plasma high-density lipoprotein and decrease low-density lipoprotein, free fatty acids, and triglycerides in mice [48]. By regulating glycogen depot through suppressing glucagon signaling, Co could also influence body weight [49]. Di Santo et al. notes that although Cr and Co concentrations were elevated in patients with metal implants, they were far from the levels that would cause disease [50]. However, we should notice that the toxicity of a particular metal or metal ion could be different along the concentration of the metal or metal ion [51, 52].

This study has several shortcomings. First, as a cross-sectional study, temporal order and causality may not be clear. It is not possible to determine the sequential relationship between metal implants and blood ion levels in vivo. Second, due to privacy considerations, the NHANES database cannot provide the geographical location of participants, nor can it determine whether they live in an urban or rural environment, close to traffic or industrial areas, which makes it impossible to assess the influence of geographical environment and occupational exposure on metal ion content in the body. Meanwhile, the participants did not report the implantation site and the type of implants in each patient. This is a highly heterogenous group. There is no clinical specificity and no additional determination regarding the type of implant, number of implants, reason for the implants or duration that the implants have been present. Also, the implant might not contain Cr or Co, and the influence of weight-bearing joint and non-weight bearing joint implants might be different. However, this study did notice the elevated blood concentrations of Cr and Co in the participants with metal implants. Patients should be noticed the change after the operation. Although, the concentration is lower than the toxicological dose, it still needs longer follow-up.

Table 1 The characteristics of participants
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Table 2 Association between metal objects and blood chromium/cobalt
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Table 3 Association between metal objects and blood chromium/cobalt, stratified by sex
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Table 4 Association between metal objects and blood chromium/cobalt, stratified by race
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Availability of data and materials

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request. The detailed information on the data is available at https://wwwn.cdc.gov/nchs/nhanes/.

Abbreviations

NHANESL:

National Health and Nutrition Examination Survey

BMI:

Body mass index

Co:

Cobalt

Cr:

Chromium

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Acknowledgements

Not applicable.

Funding

National Natural Science Foundation of China (No. 81701552, No. 81802208) fund this study.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, the Third Xiangya Hospital of Central South University, Changsha, 410013, Hunan, China

    Jinshen He, Jinfei Li & Song Wu

  2. Mathematics and Statistics School, Central South University, Changsha, 410000, Hunan, China

    Jiaoju Wang

  3. Department of Rheumatology and Immunology, the Second Xiangya Hospital of Central South University, Changsha, 410011, Hunan, China

    Qi Tang

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  1. Jinshen He
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Contributions

Jinshen He was responsible for the design of this study and performed the experiments. Qi Tang, Jinfei Li, Song Wu, and Jiaoju Wang analyzed/interpreted the results and wrote the manuscript. All authors participated in the design of the research and the review of the manuscript. The author(s) read and approved the final manuscript.

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Correspondence to Qi Tang.

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Approval of this study was obtained from the ethics review board of the National Center for Health Statistics. All participants gave written informed consent. The experimental protocol was established according to the ethical guidelines of the Declaration of Helsinki.

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Supplementary Information

Additional file 1: Supplement Figure 1.

The directed acyclic graphs of confounders.

Additional file 2: Supplement Figure 2.

The relationship between metal implants and concentrations of blood Cr/Co. It was made by the authors and approved by www.figdraw.com.

Additional file 3: Supplement File 1.

R package codes.

Additional file 4: Supplement Table 1.

Some other characteristics of participants

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He, J., Li, J., Wu, S. et al. Accumulation of blood chromium and cobalt in the participants with metal objects: findings from the 2015 to 2018 National Health and Nutrition Examination Survey (NHANES). BMC Geriatr 23, 72 (2023). https://doi.org/10.1186/s12877-022-03710-3

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Keywords

BMC Geriatrics

ISSN: 1471-2318

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