The first choice of treatment for patients with plantar fasciitis is non-invasive treatment, rather than corticosteroid injection (CSI). However, no comprehensive study has compared the effectiveness of CSI with non-invasive treatments for plantar fasciitis. We conducted a meta-analysis comparing CSI and non-invasive treatment effects on plantar fasciitis. The primary outcome was pain reduction. Nine randomized controlled trials comparing CSI with 4 non-invasive treatment types were included. A trend favoring CSI over non-invasive treatments was indicated regarding reduction in the visual analogue scale (VAS) score at 1–1.5 (mean difference (MD), 1.70; 95% confidence interval (CI) = 0.39–3.01; P = 0.01) and 2–3 months (MD, 1.67; 95% CI = 0.58–2.76; P = 0.003). At 1.5-month follow-up, CSI was associated with improved VAS score compared with physical therapy (PT) (MD, 2.5; 95% CI = 0.1–4.9; P = 0.04). No significant differences in the VAS score reduction were observed between CSI and shock wave therapy within 3 months. In summary, CSI tends to be more effective for pain reduction than non-invasive treatments within 3 months. Moreover, CSI provides significant pain relief at 1.5 months after treatment compared with PT. This study provides important clinical information for selecting therapeutics.
Plantar fasciitis is the most common cause of inferior heel pain1. Typical symptoms include pain with the first weight-bearing step in the morning, and the diagnosis can be made clinically. Some clinicians prefer to use the term plantar fasciopathy in lieu of plantar fasciitis to de-emphasise the inflammatory component because pathological examination of the fascia typically reveals degeneration over inflammation2.
Although the cause of plantar fasciitis can be multifactorial, the most common etiology is biomechanical stress of the plantar fascia at its enthesis of the calcaneal tuberosity3. Prolonged weight-bearing, obesity, limited ankle joint dorsiflexion, posterior muscle group tightness and maladaptive patterns of walking or running can produce biomechanical stress of the plantar fascia2.
To date, there are various treatments for plantar fasciitis. Common treatments can be divided into non-invasive treatments, such as physical therapy (PT)4,5,6, orthosis7,8, oral nonsteroidal anti-inflammatory drugs (NSAIDs)9, radiation therapy (RT)10 and shock wave (SW)11 and invasive treatments, such as corticosteroid injection (CSI)12,13, botulinum toxin injection14, platelet-rich plasma (PRP) injection15 and surgery16. PT for plantar fascia comprises stretching exercises and mobilization to improve lower extremity joint mobility and flexibility of the plantar fascia5. Therapeutic ultrasound, a type of PT modality, is applied to the posterior heel to increase tissue circulation and metabolism, and to soften the plantar fascia6. Orthosis includes splinting, enhancing the mechanical control of the foot and ankle7 or providing insoles for shock absorption along the inferior foot8. Oral NSAIDs are known to inhibit cyclooxygenase-2, thereby exerting an anti-inflammatory effect on the plantar fascia to relieve pain9. RT treatments expose the heel area to radiation to reduce inflammation over the treated area10. SW treatment applies high pulse SW energy to the insertion zone of the plantar fascia, potentially healing the degenerative tissue of the plantar fascia11.
Corticosteroid can accelerate the process of pain relief through its strong anti-inflammatory effect. The mechanism of action of corticosteroid, which is administered via injection, involves the inhibition of fibroblast proliferation and ground substance protein expression, which are observed in the pathological features of plantar fasciitis13. Botulinum toxin, which is injected in the plantar fascia and gastrocnemius-soleus muscular complex, can reduce the tension in the plantar fascia and relax the muscles14. PRP stimulates the natural healing process by promoting platelet growth factors, thereby accelerating the physiological healing process of the plantar fascia15. Surgical procedures, such as fasciotomy for plantar fascia release16, are usually reserved as last-resort options for treating plantar fasciitis in patients with persistent recalcitrant heel pain after receiving other treatments.
A meta-analysis found that CSI provided better pain relief than placebo in treating plantar fasciitis17. Compared to botulinum toxin and PRP injection, CSI is cheaper, more easily prepared and performed and has an acceptable therapeutic effect. There has been no evidence showing that botulinum toxin and PRP injection provided a better therapeutic effect than CSI18. Currently, CSI is still one of the first-line treatments for plantar fasciitis19. Nevertheless, from the viewpoint of patients with plantar fasciitis, if non-invasive treatments could provide a therapeutic effect equal to that of CSI, these patients would choose non-invasive treatments over CSI as their first choice. However, a review of the literature yielded no comprehensive studies comparing the efficacy of CSI with that of non-invasive treatments for plantar fasciitis. Therefore, the present study aimed to conduct a meta-analysis that compared the therapeutic efficacy of CSI and that of non-invasive treatments for plantar fasciitis.
This study was conducted in accordance with the recommendations of the Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) Statement20.
Data sources and searches
We searched the PubMed, EMBASE, MEDLINE, Cochrane Central Register of Controlled Trials, Scopus and Web of Science databases using the following terms: plantar fasciitis, plantar fasciopathy, corticosteroid, steroid and glucocorticoid in the title or abstract from the earliest records up to 22 June 2017. There were no language restrictions.
The inclusion criteria of the present study were as follows: (1) a study that compared the efficacy of CSI and a non-invasive treatment for patients with plantar fasciitis or plantar fasciopathy, with a non-invasive treatment being defined as one not penetrating the body by incision or injection; (2) a randomized controlled trial (RCT); and (3) a full-text article reporting a pain score, e.g., visual analogue scale (VAS), both before and after the treatments, as well as a pain reduction score (the change value in pain score from before to after treatments) that could be obtained. The VAS, directly reflecting subjective pain experienced at a particular body part21, has been widely used to quantify heel pain12,22. The VAS is self-reported, with 0 denoting no pain and 10 denoting the worst possible pain. The exclusion criteria of the present study were as follows: (1) the reporting of studies that combined another treatment with either CSI or non-invasive treatment during the entire treatment period; (2) the article was a case report, review, study protocol, or abstract; or (3) no pain score was reported. Two investigators (C.M.C. and M.L.) developed the selection criteria, and one of them (C.M.C.) conducted the literature search. Another investigator (C.H.L.) assessed these criteria and independently checked the enrolled trials. Discrepancies were resolved by discussion with a third investigator (C.H.L.) and by referencing the original report.
Data extraction and quality assessment
All data from eligible studies were extracted by 2 independent investigators according to a standard protocol. The extracted data included patient characteristics, treatment regimens, timing of treatment administration and details of outcome measurements. The quality of each RCT was evaluated using the Jadad scale23, in which the aggregate score ranged from 0 to 5 points.
Data synthesis and analysis
Data were extracted from baseline measurements and at 1–1.5 and 2–3 months after the initial treatment. The mean change in pain reduction score from baseline is the primary outcome. Continuous variables were compared using the mean difference (MD) and accompanying 95% confidence intervals (CIs).
Where significant heterogeneity existed (I2 ≥ 50%), a random-effects analysis was applied. The Cochrane Collaboration’s Review Manager software package (RevMan 5.3) was used for this analysis. A P-value of <0.05 was considered statistically significant.
Characteristics of included studies
At the end of the article selection process, 10 RCTs were included in the qualitative synthesis (Table 1). Of these, 1 RCT compared CSI with RT but lacked standard deviation values, which are necessary for a meta-analysis. Therefore, 9 RCTs were ultimately selected for the meta-analysis. Figure 1 shows the screening and study selection procedure. Of the 9 RCTs, 5 described CSI vs SW, 2 described CSI vs PT, 1 described CSI vs insole and 1 described CSI vs NSAIDs. CSI was administered as a single injection in all 9 trials. SWs were administered 1–5 times, and the energy efflux intensity was 0.03–0.2 mJ/mm2 in 5 trials. PT was individually administered 11 times for a 3-week duration and 84 times for a 12-week duration in 2 trials. Insole was used daily for 1 month. For NSAIDs, patients were given 1 oral tablet of diclofenac (50 mg) twice a day for 4 weeks.
The quality of the included studies is shown in Table 2. Of the the 9 RCTs included in the meta-analysis, 4 had a Jadad score of <3 and 5 (2 CSI vs SW, 2 CSI vs PT and 1 CSI vs insole) had a score of ≥3.
The present study reported outcomes using VAS. Figure 2A shows the differences between CSI and non-invasive treatments and the between-group differences in VAS score reduction at 1–1.5 months. VAS score reduction was significant between CSI and non-invasive treatments at 1–1.5-month follow-up (MD, 1.70; 95% CI = 0.39–3.01; P = 0.01). VAS score reduction was significantly greater in the CSI group than in the PT group at 1.5-month follow-up (MD, 2.5; 95% CI = 0.1–4.9; P = 0.04). VAS score reduction was significantly greater in the CSI group than in the NSAIDs group at 1-month follow-up (MD, 2.96; 95% CI = 2.56–3.36; P < 0.01; heterogeneity, not applicable for a single trial). No significant differences were observed in VAS score reduction between CSI and SW at 1–1.5-month follow-up (MD, 1.17; 95% CI = –0.91–3.24; P = 0.27).
The differences between CSI and non-invasive treatments and the between-group differences in VAS score reduction at 2–3 months are shown in Fig. 2B. VAS score reduction at 2–3 months was significant between CSI and non-invasive treatments (MD, 1.67; 95% CI = 0.58.–2.76; P = 0.003). The difference in VAS score reduction between CSI and NSAID groups at 2 months was significant (MD, 3.74; 95% CI = 3.29–4.19; P < 0.01; heterogeneity, not applicable for a single trial). No significant differences in VAS score reduction between CSI and SW at 2–3-month follow-up were found (MD, 0.89; 95% CI = −1.1–2.88; P = 0.38).
The present meta-analysis compared the efficacy of CSI and that of non-invasive treatments in the treatment of plantar fasciitis. The major finding of the present study is that CSI resulted in better pain relief from plantar fasciitis than non-invasive treatments at 1–1.5 and 2–3 months after treatment. Another major finding is that CSI had better therapeutic effect in pain relief than PT at 1.5 months after treatment. Although the present study indicated that CSI had better result than did PT in terms of pain reduction at 3 months, no significant differences were observed between CSI and PT at 3 months. In the study by Tsai et al.22, the VAS score in patients who received CSI for plantar fasciitis decreased from 5.46 (pre-injection) to 1.50 (2 weeks post-injection) and 0.77 (2 months post-injection) and then went up to 2.46 (1 year post-injection). Another study12 found that, among patients receiving CSI for plantar fasciitis, VAS scores decreased from 6.44 (pre-injection) to 3.38 (3 weeks post-injection) and then ticked up slightly to 3.63 (3 months post-injection). The time of maximum therapeutic effect with CSI might be <3 months post-injection. We speculate this is the reason why the effect of CSI was not more significant than that of PT at 3 months post-treatment.
To the best of our knowledge, there have been only a few articles published that discuss the effect of PT on plantar fasciitis. The studies by Celik et al.5 and Ryan et al.4 were the 2 that compared the efficacy of CSI and PT for the treatment of plantar fasciitis in our present study. The PT interventions in the 2 studies were stretching exercises, and participants were individually instructed by a trained therapist initially and the therapist provided follow-ups and patient guidance in sessions thereafter. Celik et al.’s article5 illustrated that patients with plantar fasciitis received 11 times of stretching exercises and joint mobilization for 3 weeks, and significant improvement in pain reduction was detected not only at 3 months but also at 1 year after treatment. We considered the possibility that the effect could last up to 1 year because these patients were advised to repeat the same stretching exercises on their own; however, completion the these self-stretching exercises was not documented. Given the lack of sufficient evidence of the therapeutic effectiveness of PT for plantar fasciitis, more studies focusing on the outcomes, times and types of PT for plantar fasciitis should be conducted in the future.
Currently, plantar fasciitis is considered not only an inflammatory condition but also a degenerative process24,25. Theoretically, SW could increase the proliferation of growth factors, peripheral blood circulation, angiogenesis and neovascularization in the degenerative tissue of the heel26, and SW is therefore believed to be effective in the treatment of plantar fasciitis. Moreover, several meta-analyses have documented the advantages of SW over placebo treatments27,28. Our present meta-analysis yielded no differences in the effectiveness of SW and CSI at 1–1.5 and 2–3 months after treatment. A study29 by Hsiao et al. also found similar results. Hsiao et al.29 reported a better therapeutic effect in CSI than in SW at 3 months after treatment; however, it also did not reach significant difference. Studies comparing SW with CSI for longer follow-up periods, such as 6 months or 1 year, are scarce. An RCT conducted by Porter et al.30, found that both SW and CSI to be effective in reducing pain in treating plantar fasciitis at 12 months after treatment, but the average VAS scores for SW and CSI at 12 months after treatment were similar. Still, more studies comparing the long-term therapeutic effect of the 2 treatments are needed.
The earliest article included in the literature review31, which was published in 1996, mentioned the use of SW for plantar fasciitis treatment, and many studies11,30,32,33,34,35 comparing the effectiveness of SW and CSI for plantar fasciitis were published after that one. One meta-analysis27 suggested that setting the highest and mostly tolerable energy output within medium-intensity range (energy flux density 0.08–0.28 mJ/mm2) is the ideal alternative when applying focal SW therapy on plantar fasciitis. One of the 5 RCTs comparing the effectiveness of SW and CSI in the present study used low-intensity SW and 4 used medium-intensity SW in their SW groups. Of the 4 RCTs comparing SW and CSI at 3 months, all used medium-intensity SW in their SW groups. Thus, it seems that even in using the most effective SW therapeutic range, pain reduction in SW was not greater than that observed in CSI.
Previous studies have discussed the efficacy of orthosis, including insole8,36 or splinting37,38, for plantar fasciitis treatment. However, only one study, by Yucel et al.8, has compared the therapeutic effect of insole use and CSI, and it showed that pain reduction was better in the CSI group than in the insole group 1 month after treatment. However, head-to-head comparison studies between orthosis and CSI for plantar fasciitis remain scarce. Wearing an orthosis for plantar fasciitis treatment usually takes long treatment period. Currently, no standard guideline exists on how many times a day and for how many days an orthosis should be worn to achieve the desired therapeutic effect in treating plantar fasciitis. The major problem that researchers encounter when they study this topic is that of measuring patient compliance.
Although oral NSAIDs are frequently prescribed to patients with acute or chronic musculoskeletal or soft tissue pain, current evidence does not support its efficacy in treating plantar fasciitis. A randomized, prospective, placebo-controlled study showed that there were no statistically significant differences between the placebo and oral NSAID groups in pain relief at 1, 2 or 6 months39. Another head-to-head study, by Biswas et al.9, comparing oral NSAIDs and CSI showed that pain relief was significantly greater after CSI than after oral NSAIDs, and the recurrence of heel pain was significantly higher in the oral NSAID group9. This study9 was the only trial included in the meta-analysis that compared VAS score reduction in CSI and NSAIDs. Our results also favored CSI, although it was limited to a single trial comparison. Considering the side effects of oral NSAIDs and their limited therapeutic effect, NSAIDs as a treatment option for plantar fasciitis depend on the risk and benefits evaluation done by the clinician.
Because of its known anti-inflammatory effects, RT has been used for >60 years. However, its exact mechanism remains unknown10. Head-to-head comparison studies between RT and CSI for plantar fasciitis are also rare. In a study by Canyilmaz et al.10, patients with plantar fasciitis randomly received either RT (a total dose of 6.0 Gy given as 1 Gy 3 times a week for 2 weeks) or CSI (1 injection with 1 mL of 40 mg methylprednisolone and 0.5 mL of 1% lidocaine), and the results in the RT group were significantly superior to those in the CSI group (VAS, P < 0.001) at 3 and 6 months after treatment. Although evidence suggests that the risk of cancer following low to intermediate RT for benign disease is small, caution must be exercised when considering RT use in younger adults40. Niewald et al.41 enrolled 127 patients to receive either a standard dose or a very low dose of RT for plantar fasciitis, in which 9 patients (7%) had to be excluded after randomization because they withdrew their informed consent to radiotherapy. Obtaining patients’ consent to RT in treating plantar fasciitis is still challenging.
Of the 9 RCTs, only a few articles mentioned the complications after treatments. Porter et al.30 and Yucel et al.35 reported that 8 and 4 patients, respectively, required analgesia due to pain after CSI. In the study by Biswas et al.9, 60 patients received CSI, 6 reported injection site erythema, 2 reported injection site infection and 2 reported plantar fascia rupture. In total, 316 patients in the 9 RCTs received CSI, of which 2 patients (0.6%) reported plantar fascia rupture and 2 (0.6%) reported injection site infection. CSI provides some relief from pain, but can be associated with severe complications. A retrospective chart review showed that, after an average of 2.67 blind injections of steroid, 2.4% of patients with plantar fasciitis (3/123) experienced plantar fascia rupture42. However, some non-invasive treatments would also result in side effects or complications. In a study by Porter et al.30, 6 patients reported throbbing pain and erythema and 4 reported severe headache or migraine after SW. Yucel et al.35 also reported that 2 patients had a mild throbbing sensation that lasted for an average of 5 days and another 2 had mild erythema after SW. Biswas et al.9 reported that 40 patients had gastritis, 5 had esophagitis, 8 had pruritus and 5 experienced bloating after oral NSAIDs.
There are some limitations to our meta-analysis. First, due to the limited number of trials, not all non-invasive treatment options could be included. Therefore, the non-invasive treatments covered in the present study may not represent all types of non-invasive treatments, and the results of comparing CSI with certain non-invasive treatments other than SW, PT, insole and NSAIDs could not be obtained. Second, outcome measurements, other than VAS, were not universally used in all included trials. Without these data, we could not discern the comprehensive outcome of various treatment options in patients with plantar fasciitis. Third, because the included trials lack long-term data, we could provide only short-term (i.e. up to 3 months) comparison data. Despite these limitations, our study demonstrates a clear comparison of therapeutic outcome between CSI and non-invasive treatments for plantar fasciitis and provides important information to clinicians that could be useful in the selection of therapeutic options.
In conclusion, compared with non-invasive treatments, CSI treatment for plantar fasciitis is associated with short-term (i.e. 3 months) pain reduction. CSI is superior to PT in relieving pain at 1.5 months. CSI and SW have similar probabilities of providing pain relief within 3 months of follow-up. Large-scale, well-designed RCTs comparing different non-invasive treatment options with CSI, with various objective outcome assessments and longer follow-up, are required in the future.
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We would like to give special thanks to all the investigators who conducted the trials included in the present meta-analysis.
The authors declare no competing interests.
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Chen, CM., Lee, M., Lin, CH. et al. Comparative efficacy of corticosteroid injection and non-invasive treatments for plantar fasciitis: a systematic review and meta-analysis. Sci Rep 8, 4033 (2018). https://doi.org/10.1038/s41598-018-22402-w
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