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 Table of Contents  
ORIGINAL ARTICLE
Year : 2019  |  Volume : 33  |  Issue : 1  |  Page : 25-30

A Comparative study of intra-articular injection of steroid versus prolotherapy for pain relief in patients of osteoarthritis knee


Department of Anaesthesiology, King George's Medical University, Lucknow, Uttar Pradesh, India

Date of Web Publication9-Apr-2019

Correspondence Address:
Dr. Hemlata
Type IV/3, SGPGI Campus, Lucknow - 226 014, Uttar Pradesh
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ijpn.ijpn_14_19

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  Abstract 

Background: Osteoarthritis (OA) is a major source of disability owing to pain and loss of function. Intra-articular (IA) injection is the last nonoperative modality that can be used. We compared the efficacy of IA steroids and prolotherapy for relieving pain in patients of knee OA. Materials and Methods: We conducted a randomized, double-blind comparative study on 56 patients of OA knee assigned into two groups: steroid and prolotherapy group. Injections were given at 0, 1, and 2 months. During 6-month follow-up, patients were evaluated for pain relief by visual analog scale (VAS) score, quality of life (QOL) score, and requirement of rescue analgesic. Results: At baseline, mean VAS score of prolotherapy group (6.71 ± 0.94) and steroid group (6.36 ± 0.99) were comparable (P = 0.166). After 6 months, mean VAS score in prolotherapy group was 4.07 ± 1.44 as compared to 3.14 ± 0.89 in steroid group, and difference was statistically significant (P = 0.009). Furthermore, at baseline, QOL score of prolotherapy group (81.75 ± 4.69) and steroid group (79.29 ± 3.89) were comparable. After 6 months, it was found to be 70.43 ± 4.97 in prolotherapy group and 67.36 ± 2.74 in steroid group, the difference being highly significant (P = 0.007). Number of patients requiring rescue analgesia (P = 0.280) and the mean number of doses of rescue analgesic consumed (P = 0.538), both were slightly higher in prolotherapy group. Conclusion: Intra-articular steroid was better than prolotherapy in relieving pain of OA knee.

Keywords: Intra-articular steroid, osteoarthritis knee, prolotherapy, quality of life questionnaire, visual analog scale


How to cite this article:
Singh S, Kumar S, Hemlata, Chaudhary A, Malik A. A Comparative study of intra-articular injection of steroid versus prolotherapy for pain relief in patients of osteoarthritis knee. Indian J Pain 2019;33:25-30

How to cite this URL:
Singh S, Kumar S, Hemlata, Chaudhary A, Malik A. A Comparative study of intra-articular injection of steroid versus prolotherapy for pain relief in patients of osteoarthritis knee. Indian J Pain [serial online] 2019 [cited 2019 Nov 15];33:25-30. Available from: http://www.indianjpain.org/text.asp?2019/33/1/25/255707


  Introduction Top


Osteoarthritis (OA) is a clinical syndrome of joint pain which is characterized by gradual loss of articular cartilage, osteophyte formation, subchondral bone remodeling, and inflammation of the joint.[1] OA knee is a major source of disability worldwide owing to pain and loss of function.[2] When oral analgesics are ineffective, intra-articular (IA) injection (corticosteroids, viscosupplements, blood-derived products, prolotherapy) is the last nonoperative modality that can be performed.[3],[4] Synovial inflammation plays a critical role in the symptoms and structural progression of OA.[5]

Corticosteroids have been a mainstay in the treatment of OA knee owing to their anti-inflammatory and immunosuppressive effects. Clinically, it causes decrease in erythema, swelling, heat, and tenderness of the inflamed joints. It also leads to increase in relative viscosity of the synovial fluid with an increase in hyaluronic acid (HA) concentration.[6],[7]

Prolotherapy is an emerging cost-effective treatment option for chronic musculoskeletal pain conditions including OA knee. It involves the injection of a small amount of an irritant substance (most commonly, hypertonic solution of dextrose) into synovial space. It is presumed to work by several mechanisms including a direct, an osmotic, and an inflammatory growth effect.[8] The hypothesized mechanisms for pain relief include stimulation of local healing among chronically injured extra- and intra-articular tissues, reduction of joint instability through the strengthening of stretched or torn ligaments, and stimulation of cellular proliferation.[9]

To the best of our knowledge, no study till date has compared the efficacy of IA steroids with prolotherapy for pain relief in patients of OA knee. Therefore, this study was undertaken to compare the efficacy of IA steroids with prolotherapy.


  Materials and Methods Top


This prospective randomized double-blinded study was conducted on patients visiting pain clinic OPD of our institute from September 2017 to August 2018. Prior institutional ethics committee approval (Ref. code: 88th ECM II B-Thesis/P19) and written informed consent from the patients were obtained. This study is registered with Clinical Trials Registry of India (CTRI/2018/05/014227).

We enrolled 70 adult patients aged 40–70 years, of knee OA Grade I or II having pain with Visual Analog Scale (VAS) score >5. Patients giving negative consent, with inflammatory arthritis, for example, Rheumatoid arthritis, diabetes mellitus, history of recent surgery or IA injection of steroid or HA in last 3 months, platelet count <150,000/mm3, on anticoagulant therapy, any liver or hematological or coagulation disorders, any active local site infection, or malignancy were excluded from the study. After excluding 6 patients, 64 patients scheduled for IA knee injection were randomly allocated to two groups of 32 each using a sealed envelope method. A computer-generated random allocation sequence, concealed in 64 consecutively numbered, sealed envelopes, mentioning group distribution, was prepared by a ward nurse not involved in the trial.

After explaining the procedure and taking proper written and informed consent, the patients were taken in the procedure room. Before the procedure, baseline VAS score was measured and baseline quality of life (QOL) score was measured by filling McGill QOL questionnaire.[10] The assigned envelopes were opened by enrolled patients on the day of injection for group allocation. All the monitors were attached (i.e. pulse oximeter, noninvasive blood pressure, and electrocardiogram). An anesthesia technician, otherwise not involved in the study, prepared the injections (total volume 6 ml) depending on the group allocated.

  • Group A (prolotherapy): solution consisted of 5 ml of 25% dextrose with 1 ml lignocaine 2%
  • Group B (steroid): solution consisted of 40 mg (1 ml) triamcinolone acetonide, 1 ml of lignocaine 2%, and 4 ml sterile water.


The patients were laid supine with a small pillow or bolster under the knee to place the joint in mild flexion. The part was cleaned properly and draped under proper aseptic conditions. Using anterolateral approach, anterior aspect of the knee was palpated to locate the patellar tendon. Moving 1 cm lateral to patellar tendon, a depression was present which marked the entry point of needle. A 10 ml syringe with 21-gauge needle was used. The needle was placed perpendicular to the skin with tip of needle directed at 45° angle into the center of knee. The placement of needle was confirmed by C-arm. The needle was aspirated to look for any fluid. The drug was then injected into the joint space depending on the group allocated.

After the injection, patients were advised on relative knee rest for 2–4 days with progressive resumption of routine activity over 1 month. The patients were asked to take paracetamol tablets in case of any complaint of pain during the study period. They were discouraged from using NSAIDs and from starting new therapies for pain during the study period.

The injections were repeated at 1 and 2 months irrespective of any relief in symptoms and were given only after recording VAS and QOL scores. All the parameters including VAS scores were recorded by an assessor who was unaware of the group allocation and did not participate in the IA injection of drugs.

Follow-up was done through OPD visits of patients at 1 week and at monthly intervals upto 6 months and through regular telephonic communications regarding pain relief with respect to VAS score, requirement of rescue analgesics and improvement of QOL (using McGill QOL Questionnaire). We also looked for any side effect after injection. The VAS score ranged from 0 to 10, with 0 indicating no pain and 10 indicating the worst imaginable pain. All the above parameters were recorded, and appropriate statistical tests were applied on collected data.

Statistical analysis

The statistical analysis was done using Statistical Package for Social Sciences (SPSS Inc., Chicago, IL, USA) Version 21.0. All normally distributed, continuous variables were presented as mean ± SD To compare the means between or within independent groups, the independent samples t-test was used. The Chi-square test was used to compare proportions as appropriate. The VAS pain scores and the QOL score were analyzed using the Mann–Whitney U test. P < 0.05 was considered significant. The results were analyzed using paired t-test for continuous, and Chi-square test for categorical variables.

Sample size estimation

Based on previous studies,[11],[12] the hypothesized difference of 1.2 in terms of VAS was considered to be clinically significant. Assuming a type I error of 0.05 and a desired power value of 80% using the two-tailed Z-test for proportions, 28 patients were calculated as the minimum sample size for each group. The significance level of the test was targeted at 0.05. Considering possible dropouts, 35 patients were included in each group.


  Results Top


Among the seventy patients who were enrolled for the study, 6 were excluded as they were found to have diabetes mellitus. Of the remaining 64 patients included in study, only 56 patients completed the study [Figure 1]. Four patients in Group B were excluded as they discontinued treatment in-between. Four patients in Group A were excluded from the study following initial randomization and were not considered for further analysis; three patients preferred to undergo total knee arthroplasty while the other patient did not come for follow-up.
Figure 1: CONSORT flow chart. A total of 70 patients were enrolled for eligibility, of which 64 patients were posted for study following randomization and 56 patients completed the study and were assessed for statistical analysis

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There was no difference between groups regarding age, gender distribution, grade of OA, side of knee involved, and mean platelet count [Table 1].
Table 1: Comparison of demographic profile and baseline characteristics

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There was decrease in mean VAS score from baseline in both the groups, and it was lower in steroid group as compared to prolotherapy group at all intervals. The difference in the VAS score between both the groups was also statistically significant (P < 0.05) at all the follow-up time intervals except at 3 months (P = 0.094) [Table 2].
Table 2: Comparison of visual analog scale scores at baseline and different follow-up intervals between two groups

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There was improvement in QOL of patients in both the groups as evident from decrease in mean QOL scores from baseline at all the subsequent intervals. At all the time intervals, mean QOL scores were lower in steroid group as compared to prolotherapy group. The difference between both the groups was also statistically significant (P < 0.05) at all the follow-up time intervals except at 2 months (P = 0.080) and 3 months (P = 0.185) [Table 3].
Table 3: Comparison of quality of life scores at baseline and different follow-up intervals between two groups

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Overall requirement of rescue analgesic, total doses of rescue analgesic consumed, and incidence of side effects were more in prolotherapy group [Table 4]. This further supports the superiority of analgesic efficacy of IA steroids over prolotherapy.
Table 4: Total number of patients requiring rescue analgesia, total number of doses of rescue analgesic used, and other side effects

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  Discussion Top


Our study showed that both steroid as well as prolotherapy were effective in the nonoperative management of patients with knee OA, but steroid was much better in relieving pain as well as QOL of the patients.

Many studies done in past have shown the efficacy of IA injection of steroids in decreasing pain in patients with OA knee. Raynauld et al.,[13] in their study, reported that OA patients who received long-term intra-arterial injections of triamcinolone acetonide showed improvements in pain (described in terms of WOMAC pain subscale) compared with the saline control patients. Shikhar et al.[14] observed that use of IA corticosteroids was safe and could be beneficial in providing short-term as well as long-term pain relief from OA knee. The findings of their studies are in agreement with that of our study in which IA injection of triamcinolone acetonide resulted in a decrease in VAS score from 6.36 ± 0.99 at baseline to 4.32 ± 0.82 at 1 month and 3.14 ± 0.89 at 6 months. Another study conducted by Dieppe et al.[15] showed that IA steroid injections caused a significantly greater reduction in pain and tenderness than placebo injections and were preferred by patients.

There are some other studies in which triamcinolone was found to be better than other steroids. Pyne et al.[16] reported that triamcinolone was statistically more efficient in pain relief than methylprednisolone 3 weeks after injection. In a 6-month randomized study, Valtonen [17] showed that multiple triamcinolone injections provided more long-term beneficial effects in patients with symptomatic OA as compared to betamethasone. Furthermore, Blyth et al.[18] found triamcinolone to be more efficacious than hydrocortisone for relieving IA pain. Based on all these studies, we selected triamcinolone for our study, and out of triamcinolone acetonide and hexacetonide, we used triamcinolone acetonide because it was relatively easily available in our setup.

We used a dose of 40 mg of TA as it was found to be clinically effective for relief of symptoms of OA knee in many previous studies like that of Raynauld et al.[13] and Jain and Jain [19] A systematic review with meta-analysis by Godwin and Dawes [20] had concluded that intra-articular corticosteroid injection results in clinically and statistically significant reduction in osteoarthritic knee pain 1 week after injection. They further concluded that the beneficial effect could last for 3–4 weeks but was unlikely to continue beyond that. Similarly, Bellamy et al.[21] and Ravaud et al.[22] had also found only short-term pain relief (up to 4 weeks) from IA corticosteroids after which their effects reduced gradually. Based on these evidences, we kept the timing for repeat injections at 1 and 2 months after the first one.

There are a number of studies which found prolotherapy to be beneficial in alleviating pain of OA knee. Reeves et al.[23] in their study reported that dextrose prolotherapy injection was clinically superior to bacteriostatic water in treatment of OA knee, with substantial improvements in joint pain, subjective joint swelling, flexion range of motion, and tendency for knee buckling. Furthermore, Sit et al.[24] in their systematic review concluded that prolotherapy is significantly beneficial in the treatment of OA knee. In our study also, prolotherapy was found to be efficacious in relieving pain of OA knee from a VAS score of 6.71 at baseline to 5.25 at 1 week and 4.07 at 6 months.

Though IA steroids has never been compared with prolotherapy in knee joint, there had been few studies which compared IA steroids with prolotherapy in joints other than knee to compare their efficacy in relieving pain. Jahangiri et al.[25] while comparing IA steroid with prolotherapy in their study found that the pain relief in both the groups was comparable at 2 months, but the results were better for corticosteroid at 1 month, and apparently more favorable outcome for prolotherapy at 6 months (with mean difference [95% CI] in VAS = 1.1 [0.2, 2.0], P = 0.02). In another study conducted by Kim et al.,[26] authors reached to the conclusion that IA prolotherapy provided significant relief of sacroiliac joint pain, and its effects lasted longer than those of steroid injections. In both the above studies, prolotherapy was found to be more beneficial than IA steroids. This disparity in their results with ours could be due to a different joint involved, different drug used (methylprednisolone acetate by Jahangiri et al.[25]), different dose of drug used (1 ml by Jahangiri et al.[21] and 2.5 ml by Kim et al.[26]), and different local anesthetic agent used for dilution (2% lidocaine by Jahangiri et al.[25] and 0.25% levobupivacaine by Kim et al.[26]).

The QOL has never been studied as separate entity to compare steroid and prolotherapy in knee OA. However, in the previous studies, various other means have been used such as range of motion, WOMAC (Western Ontario and Mc Master Universities OA Index) function score, Oxford knee score (OKS) questionnaire, joint stiffness, etc., to assess the functional improvement of the knee joint and QOL of the patient.

In our study, we compared the improvement in QOL in terms of score depending on the answers given to McGill QOL questionnaire.[10] We observed that the mean QOL scores at baseline were comparable in both the groups, the score being slightly higher in prolotherapy group as compared to that of steroid group but the difference was not statistically significant. At all the subsequent follow-up intervals, there was more improvement in the steroid group, and the difference in scores between two groups was statistically significant except at 2nd and 3rd month.

In their study, Raynauld et al.[13] demonstrated that the OA patients who were administered triamcinolone acetonide intra-articularly had significantly greater range of movement and improvement in joint stiffness than the patients receiving saline. They found an improvement in WOMAC function score which is in agreement with the findings of a decrease in QOL scores in our study. Buyuk et al.[11] also reported that IA steroid, i.e. triamcinolone and methylprednisolone are effective at improving function in patients with OA knee. Jain and Jain [19] also found an improvement in the WOMAC scores with steroids which were comparable in both triamcinolone and methylprednisolone groups. Shikhar et al.[14] observed improvement in QOL with steroids (methylprednisolone and triamcinolone). Jain et al.[19] also reported the role of steroids (methylprednisolone and triamcinolone) in improving the stiffness and joint function.

In a study by Eslamian et al.,[27] they concluded that dextrose prolotherapy resulted in significant improvement of validated pain, ROM, and WOMAC-based function scores, when baseline levels were compared at 24 weeks. Rabago et al.[28] found significant improvements in composite WOMAC scores at 26 and 32 weeks which remained stable up to 52 weeks for the dextrose “prolotherapy” group compared with “saline injections” and “at home exercise” groups. On completing OKS questionnaire which included important functional points (amount of the time able to walk without pain, limping, or giving way the knee, etc.), Farpour et al.[29] concluded that dextrose prolotherapy improves the functional status of knee joint. Sit et al.[24] also stated that IA dextrose prolotherapy provide immediate, practical benefits to individual patients and improved QOL.

A study was conducted by Jahangiri et al.[25] to compare the efficacy of prolotherapy with IA steroid in first carpometacarpal joint in terms of joint function. They found that both prolotherapy and corticosteroid injection increased functional level, but prolotherapy seemed to be more effective (mean difference [95% CI] in total function score = 1.0 [0.2, 1.8], P = 0.01). The discrepancy between our study and their study might be because of use of a different steroid (methylprednisolone acetate), different dose of drug (1 ml), different local anesthetic agent used for dilution (lidocaine 2%), different questionnaire for assessment of QOL, and involvement of a different joint in which the drug was administered.

In our study, we also compared need for rescue analgesia between IA steroids and prolotherapy and found a greater need for rescue analgesics (paracetamol tablets) post-prolotherapy (50% patients) as compared to postintraarterial steroid injection (35.7% patients) pointing toward much better pain-relieving efficacy of steroids than prolotherapy.

Just like the number of patients requiring rescue analgesic, the total doses of rescue analgesic (paracetamol tablets) consumed were also lesser post-IA steroid injection compared to postprolotherapy. However, the difference between the two groups was not statistically significant (P = 0.538).

As far as the incidence of side effects are concerned, it was more in prolotherapy group (4 patients [14.3%] vs. 2 patients [7.1%]). In prolotherapy group, one patient experienced flare, one complained of nausea, one patient had redness over the injection site, and one complained of pain post injection at local site. Whereas in steroid group, both the patients complained of nausea and no other side effect. There was no significant difference between the two groups with respect to side effects.

Limitations

First, the sample size was not large enough to reveal significant between-group differences in clinical efficacy data and detect uncommon adverse events. Another limitation was the use of VAS score for assessing pain as it is a subjective test for evaluating outcomes and is subject to bias. Lack of a control (placebo) group and limited timeframe for the study were other limiting factors.


  Conclusions Top


We concluded that both steroid (triamcinolone acetonide) and prolotherapy (25% dextrose) are effective as IA injections in knee joint for providing pain relief and improving QOL in patients of OA knee; however, steroid is more efficacious than prolotherapy for both. As both provide analgesia by different modes of action, a multimodal approach can be used to provide more complete analgesia with minimal side effects.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.

 
  References Top

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Shikhar P, Pandey JK, Narayan A, Mahajan R. A prospective clinical evaluation between intra-articular injections of methyl prednisolone and triamcinolone in osteoarthritis of knee based on the efficacy, duration and safety. Int J Curr Microbiol Appl Sci 2013;2:369-81.  Back to cited text no. 14
    
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