Abstract
Background
As the ultimate method for the treatment of osteoarthritis, total knee arthroplasty (TKA) has been widely used in the clinic. Local injection of multimodal cocktails, including corticosteroids, is commonly used for pain management after TKA. This meta-analysis aims to systematically evaluate the effect of periarticular injection of corticosteroids on postoperative pain relief and knee functional recovery in patients undergoing TKA.
Methods
PubMed, Cochrane Library, EMBASE, and Web of Science databases were comprehensively searched for all randomized controlled trials (RCTs) published before July 1, 2020, that investigated the efficacy of corticosteroids for TKA.
Results
Ten RCTs involving a total of 829 patients were assessed in the meta-analysis. Compared with the control group, the visual analogue scale (VAS) score at rest of the corticosteroid group decreased significantly at postoperative day 1 (POD1), POD2, and POD3 (p < 0.05). Besides, the range of flexion motion of the knee joint in the corticosteroid group at POD1 and POD2 was significantly increased (p < 0.05); at the same time, the range of extension motion at POD2 and POD3 showed the opposite trend between the two groups (p < 0.05). The morphine equivalent of postoperative analgesia was significantly reduced (p < 0.05), and the time required for straight leg raising (SLR) was significantly shortened (p < 0.05). There was no significant difference between the two groups in terms of postoperative drainage, length of hospital stay, and complications such as infection, nausea, and vomiting (p > 0.05).
Conclusion
The additional corticosteroids to multimodal cocktail periarticular injection can relieve the early pain intensity at rest after TKA, increase the early range of motion (ROM) of the knee joint, reduce the dosage of postoperative analgesics, and shorten the duration of time required for SLR. However, it has no effect on reducing postoperative complications and shortening the length of hospital stay.
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Background
Total knee arthroplasty (TKA) is the ultimate treatment for severe knee arthritis, but it often leads to unbearable postoperative pain and pain-related knee joint dysfunction [1, 2]. Perfect postoperative analgesia is essential to improve patient comfort and promote their rapid recovery [3, 4].
Periarticular infiltration analgesia is widely used in the clinic to relieve pain after TKA [5, 6]. It can suppress the inflammation at the surgical site, provide satisfactory analgesic effects, maintain muscle strength, and reduce the consumption of opioids and related complications [6,7,8]. Corticosteroids have been widely used in various surgical procedures as an anti-inflammatory drug [9, 10]. Some studies have reported that the addition of corticosteroids to multimodal cocktail periarticular injection can inhibit inflammation and provide additional analgesia [11, 12], while others have found no benefit and may even increase the risk of complications [13, 14]. Therefore, in order to draw a more convincing conclusion, a comprehensive analysis of the relevant data of this kind of research has a certain clinical significance. Prior to this, some related meta-analysis has been conducted, but most of them are insufficient to a certain extent. The studies of Fan et al. [15], Zhou et al. [16], and Meng et al. [17] confused the intravenous and local application of corticosteroids. Chai et al. [18] failed to distinguish between periarticular injection and intra-articular injection in their study and did not convert different kinds of drugs in the analysis of postoperative analgesic consumption. Ultimately, the above factors led to the poor credibility of these existing meta-analyses, so it is necessary to make further analysis.
In order to solve this problem, this meta-analysis, by analyzing the current RCTs involving periarticular injection only, aims to clarify whether periarticular injection including corticosteroids can relieve postoperative pain and improve knee joint function in different time points, and explore its safety. In addition, two recent RCTs [19, 20] were included in this study to obtain a higher quality result.
Methods
We conduct this meta-analysis according to the rules of Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) [21].
Search strategies
The PubMed, Cochrane Library, EMBASE, and Web of Science databases were comprehensively searched for randomized controlled clinical trials (RCTs) published before July 2020 that investigated the efficacy of additional corticosteroids to multimodal cocktail periarticular injection in TKA. In addition, the reference lists of all included studies were checked for any potential additional publications. We used the keywords of knee arthroplasty, knee replacement, glucocorticoids, glucocorticosteroid, corticosteroid, and so on. The detailed search strategies for each database are presented in the Supplemental materials (Supplementary Table. 1 Details about the search strategies).
Inclusion and exclusion criteria
Inclusion criteria:
(1) Randomized controlled trials (RCTs); (2) the target population consisted of patients undergoing unilateral primary TKA; (3) additional corticosteroids added in multimodal cocktail for the corticosteroid group; (4) no other difference between the corticosteroid group and control group besides the administration of corticosteroids; (5) only periarticular injection approach was administered; (6) the outcomes were related with VAS, range of motion (ROM) of the knee, postoperative drainage, duration of time required for straight leg raising (SLR), length of hospital stay, consumption of opioid for postoperative analgesia, and incidence of complications such as postoperative infection, wound oozing, nausea, and vomiting; (7) the full text was available.
Exclusion criteria:
(1) Patients undergoing bilateral TKA, unicondylar knee arthroplasty, or revision; (2) patients with a long history of corticosteroid medication; (3) intra-articular injection; (4) animal studies.
Data extraction
Two reviewers independently screened the papers from their titles and abstracts and selected relevant studies that met the eligibility criteria. Data were extracted and collated independently by the same two reviewers independently with any disagreement settled by a third reviewer. We would send an e-mail to the original investigators when requisite data were lacking in the publications.
The following items were extracted: (1) basic information: name of the first author, publication date, sample size, and demographic data of participants; (2) techniques: corticosteroid type, dosages, drug regimens; perioperative medication; and anesthesia method; (3) primary outcome: VAS scores at rest and on motion and range of motion (ROM) of the knee; (4) secondary outcome: postoperative drainage, duration of time required for straight leg raising (SLR), length of hospital stay, consumption of opioid for postoperative analgesia, and incidence of complications such as postoperative infection, wound oozing, nausea, and vomiting. The raw data are presented in the supplementary materials (Supplementary Table. 2 Raw data).
Statistical analysis
The meta-analysis was conducted using Review Manager Software (Revman 5.4, Cochrane Collaboration, Oxford, UK). Continuous data was expressed by weighted mean difference (WMD) and 95% confidence interval (CI), and dichotomous data was expressed by relative risk (RR) and 95% CI. Cochran’s Q test and Higgins’ I2 statistical test were used to assess the statistical heterogeneity. The results showed a low level of heterogeneity when I2 < 50%, and a fixed-effects model would be used. The results showed significant heterogeneity when I2 ≥ 50%, then sensitivity analysis and subgroup analyses would be conducted to find the source of the heterogeneity. If the heterogeneity could not be eliminated, a random effects model that estimated the uncertainty of results with sampling error and study variance would be used when the related studies had no clinical heterogeneity. Descriptive analysis was used for data that cannot be merged.
Risk of bias assessment was done by using the Cochrane Collaboration tool (Cochrane, London, UK). Finally, a funnel plot was used to assess potential publication bias visually.
Results
Search results and study characteristics
A total of 675 articles were retrieved, and 271 of them remained after excluding duplicate articles. After reading the title and abstract, 199 articles were eliminated, leaving 72. Sixty-two articles were discarded for various reasons (retrospective study, review article, unicondylar knee arthroplasty, case report, intravenous injection, and expert consensus or guide) when the full text was browsed for further screening, and 10 studies [11, 12, 14, 19, 20, 22,23,24,25,26] finally met the inclusion criteria (Fig. 1, flow chart of study selection). The characteristics of the 10 studies which involved 829 participants are summarized in Table 1.
Primary outcomes
VAS score at rest
The pooling results showed that the VAS score at rest of the corticosteroid group was significantly lower than that of the control group at postoperative day 1 (POD1) (MD − 0.65; 95% CI − 1.29 to − 0.01; p < 0.05; I2 = 82%), POD2 (MD − 0.33; 95% CI − 0.50 to − 0.16; p < 0.05; I2 = 0%), and POD3 (MD − 0.40; 95% CI − 0.69 to − 0.12; p < 0.05; I2 = 30%) day after the operation. There was no significant difference in VAS score at the operation night, POD4, POD5, POD7, and 2 weeks after the operation. The meta-analysis result at POD1 showed heterogeneity. Sensitivity analysis and subgroup analysis failed to find the source of heterogeneity. Considering that there was no clinical heterogeneity in these studies, a random effect model was used to analyze it. The rest of the data was analyzed using fixed effects (Fig. 2, VAS score at rest).
VAS score on motion
The results showed that there was no significant difference in VAS score on motion between the corticosteroid group and control group at POD1, POD2, and POD3. The meta-analysis results showed obvious heterogeneity at POD1. Sensitivity analysis and subgroup analysis could not eliminate heterogeneity, so a random effect model was used to analyze the relevant results. The rest of the data were analyzed by fixed effect. VAS scores at other time points after operation were not analyzed because of the limited sample size (Fig. 3, VAS score on motion).
Range of flexion motion
Compared with the control group, the range of flexion motion of the knee joint was increased in the corticosteroid group at POD1 (MD 5.38; 95% CI 2.39 to 8.37; p < 0.05; I2 = 0%) and POD2 (MD 3.35; 95% CI 0.53 to 6.17; p < 0.05; I2 = 47%). However, there was no significant difference between the two groups at POD3, POD4, POD5, POD7, and 2, 4, 6, 12, and 24 weeks after surgery. Heterogeneity was detected at 4 weeks after the operation. Sensitivity analysis and subgroup analysis failed to eliminate the heterogeneity, so the random effect model was used (Fig. 4, range of flexion motion).
Range of extension motion
The results showed that the range of extension motion in the corticosteroid group decreased at POD2 (MD − 2.09; 95% CI − 3.80 to − 0.38; p < 0.05; I2 = 23%) and POD3 (MD − 2.01; 95% CI − 3.54 to − 0.49; p < 0.05; I2 = 39%) compared with the control group. On the contrary, there was no significant difference between the two groups at POD1, POD4, and POD5. There was certain heterogeneity in the data at POD1, but it could not be eliminated after sensitivity analysis and subgroup analysis. After confirming that there was no clinical heterogeneity in the related studies, the random effect model was applied (Fig. 5, range of extension motion).
Secondary outcomes
Morphine equivalent for postoperative analgesia
A total of 5 studies, 389 cases, involved opioid consumption for postoperative analgesia. All opioid doses were converted to corresponding morphine equivalent for statistical analysis in this meta-analysis. The results showed that the postoperative analgesic dosage of patients in the corticosteroid group was significantly less than that of the control group (MD − 4.68; 95% CI − 5.93 to − 3.43; p < 0.05; I2 = 0%) (Fig. 6, morphine equivalent).
Postoperative drainage
The postoperative knee joint drainage was recorded in 3 studies including 292 patients. The results showed that there was no significant difference in drainage volume between the two groups (MD − 9.41; 95% CI − 47.61 to 28.80; p > 0.05; I2 = 49%) (Fig. 7, postoperative drainage).
Time required for straight leg raising (SLR) and length of hospital stay
The time required for SLR was shown in 2 studies, involving 252 cases, and better outcome was shown in the corticosteroid group (MD − 0.58; 95% CI − 0.81 to − 0.35; p < 0.05; I2 = 0%) (Fig. 8, time required for straight leg raising). The length of hospital stay was reported in 3 studies, with 278 cases, and the pooled outcomes showed no significant difference (MD − 0.78; 95% CI − 1.85 to 0.28; p > 0.05; I2 = 93%) (Fig. 9, length of hospital stay). The random effect model was used to analyze data about the length of hospital stay, because related studies had clinical homogeneity; besides, sensitivity analysis and subgroup analysis could not eliminate the heterogeneity.
Incidence of complications
A total of 9 studies, 758 cases, reported the occurrence of postoperative surgical site infection. Six of the studies showed that there was no postoperative infection that occurred in the two groups. The meta-analysis results of the remaining three studies indicated that no significant difference existed in the incidence of infection between the two groups (RR 1.98; 95% CI 0.37 to 10.66; p > 0.05; I2 = 0%). Two studies involving 202 cases reported no tendon rupture occurred in both groups. Five studies, involving 455 cases, recorded postoperative nausea and vomiting (RR 1.08; 95% CI 0.69 to 1.69; p > 0.05; I2 = 0%), and 3 studies with 329 cases showed the wound oozing (RR 1.30; 95% CI 0.55 to 3.07; p > 0.05; I2 = 0%). Pooled outcomes showed no significant difference (Fig. 10, incidence of complications).
Bias assessment
We can learn from the risk of bias graph (Fig. 11, risk of bias graph) that two studies [14, 23] had a high risk for attrition bias, while other studies have not found any high-risk items. As for the publication bias, the funnel plot has no obvious asymmetry, so we concluded that there was no significant publication bias (Fig. 12, funnel plot).
Discussion
Severe postoperative pain of TKA significantly affects the patient’s experience and postoperative rapid recovery. Exploring effective postoperative analgesia is of great significance. Patient-controlled intravenous analgesia (PCIA) often requires large doses of opioid analgesics, which often lead to complications such as nausea and vomiting, skin itching, and even respiratory depression [27]. Epidural block and femoral nerve block are effective methods for pain control after TKA, but they may weaken the strength of quadriceps femoris and affect the early rehabilitation of patients [6, 28, 29]. Adductor canal block can provide the same postoperative analgesic effect as femoral nerve block without inhibiting the strength of quadriceps femoris, but it cannot effectively cover the lateral and posterior part of the knee [30, 31]. From the above, it can be seen that conventional analgesic methods are difficult to provide perfect analgesic effect after TKA, and it is of great clinical value to explore new analgesic methods. Some studies have shown that periarticular injection can obtain good analgesic effect and even improve the postoperative range of motion and promote rehabilitation [6, 32, 33]. Local injections often contain local anesthetics such as ropivacaine or bupivacaine, epinephrine, nonsteroidal anti-inflammatory drugs, and morphine [6, 22, 34]. In addition, some studies have added corticosteroids to multimodal cocktail periarticular injection, but the results are not consistent [12, 14, 22, 24,25,26, 35]. Although current studies have not found that corticosteroids increase the risk of serious complications such as postoperative infection, their clinical application is still concerned. The purpose of this meta-analysis was to evaluate whether the addition of corticosteroids to periarticular injection can relieve postoperative pain and promote knee function recovery after TKA, and to determine whether it is safe enough.
The results of this study showed that the addition of corticosteroids to the periarticular injection could relieve the pain score at rest from POD1 to POD3 and improve flexion range of POD1 and POD2 and extension range of POD2 and POD3. In addition, it also reduces the postoperative consumption of opioids and promotes the recovery of straight leg raising function. Similar to previous studies, corticosteroids did not increase the incidence of adverse reactions such as infection, tendon rupture, wound oozing, nausea, and vomiting. However, our research results show that corticosteroids are not significantly helpful in relieving pain scores on motion, reducing wound drainage, and shortening hospital stay.
There is a close relationship between postoperative pain and inflammatory response [36]. Some studies have shown that corticosteroids can alleviate pain by inhibiting inflammatory response [19, 37]. However, due to the lack of relevant studies, this meta-analysis did not make detailed statistics on inflammatory indicators such as C-reactive protein, erythrocyte sedimentation rate, and IL-6. Better knee function recovery may be related to better pain relief. There was no significant difference in the range of knee joint motion between the two groups at POD4, which may reflect that corticosteroids cannot provide long-lasting analgesia. In summary, our results show that although the addition of corticosteroids to multimodal cocktail periarticular injection does not significantly help the long-term rehabilitation after TKA, it can obviously alleviate the early postoperative pain and improve the early knee joint function, and it did not increase the incidence of related complications.
The limitations of our study mainly include the following aspects. (1) There were only 10 randomized controlled trials and 827 cases in our study. Therefore, a larger sample size is needed for further research, and it is even possible to compare and analyze the efficacy of different corticosteroids. (2) Meta-analysis of some ROM, VAS score, and length of hospital stay showed heterogeneity, but sensitivity analysis and subgroup analysis failed to eliminate it. After excluding clinical heterogeneity, the random effects model is used for data processing, which may have a slight impact on the reliability of the result. (3) The included studies lack inflammatory indicators such as IL-6, C-reactive protein, and erythrocyte sedimentation rate, which cannot explain the related mechanism in a deeper level.
Conclusion
Adding corticosteroids into periarticular injection can relieve pain score at rest and improve the ROM of the knee in early stage after TKA. In addition, it can reduce the consumption of opioids and promote the recovery of straight leg raising function. Moreover, the use of corticosteroids did not increase the incidence of adverse reactions such as infection, tendon rupture, wound ozzing, nausea, and vomiting. However, it had no significant effect on relieving pain scores on motion, reducing wound drainage, and shortening hospital stay.
Availability of data and materials
All data generated or analyzed during this study are included in published articles.
Change history
19 March 2021
A Correction to this paper has been published: https://doi.org/10.1186/s13018-021-02317-5
Abbreviations
- TKA:
-
Total knee arthroplasty
- RCTs:
-
Randomized controlled trials
- VAS:
-
Visual analogue scale
- POD1:
-
Postoperative day 1
- ROM:
-
Range of motion
- SLR:
-
Straight leg raising
- PRISMA:
-
Preferred Reporting Items for Systematic Reviews and Meta-Analyses
- WMD:
-
Weighted mean difference
- CI:
-
Confidence interval
- RR:
-
Relative risk
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Li, Q., Mu, G., Liu, X. et al. Efficacy of additional corticosteroids to multimodal cocktail periarticular injection in total knee arthroplasty: a meta-analysis of randomized controlled trials. J Orthop Surg Res 16, 77 (2021). https://doi.org/10.1186/s13018-020-02144-0
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DOI: https://doi.org/10.1186/s13018-020-02144-0