Blinding Strategies in Dry Needling Trials: Systematic Review and Meta-Analysis

Transcutaneous auricular vagus nerve stimulation modifies cortical excitability in middle-aged and older adults

There is a growing interest in the clinical application of transcutaneous auricular vagus nerve stimulation (taVNS). However, its effect on cortical excitability, and whether this is modulated by stimulation duration, remains unclear. We evaluated whether taVNS can modify excitability in the primary motor cortex (M1) in middle-aged and older adults and whether the stimulation duration moderates this effect. In addition, we evaluated the blinding efficacy of a commonly reported sham method. In a double-blinded randomized cross-over sham-controlled study, 23 healthy adults (mean age 59.91 ± 6.87 years) received three conditions: active taVNS for 30 and 60 min and sham for 30 min. Single and paired-pulse transcranial magnetic stimulation was delivered over the right M1 to evaluate motor-evoked potentials. Adverse events, heart rate and blood pressure measures were evaluated. Participant blinding effectiveness was assessed via guesses about group allocation. There was an increase in short-interval intracortical inhibition (F = 7.006, p = .002) and a decrease in short-interval intracortical facilitation (F = 4.602, p = .014) after 60 min of taVNS, but not 30 min, compared to sham. taVNS was tolerable and safe. Heart rate and blood pressure were not modified by taVNS (p > .05). Overall, 96% of participants detected active stimulation and 22% detected sham stimulation. taVNS modifies cortical excitability in M1 and its effect depends on stimulation duration in middle-aged and older adults. taVNS increased GABAAergic inhibition and decreased glutamatergic activity. Sham taVNS protocol is credible but there is an imbalance in beliefs about group allocation.

Acute Effects of the Dry Needling Session on Gastrocnemius Muscle Biomechanical Properties, and Perfusion with Latent Trigger Points - A Single-Blind Randomized Controlled Trial in Mixed Martial Arts Athletes

The study aimed to evaluate the immediate effects of a dry needling (DN) therapy session on biomechanical properties, muscle power, perfusion, and pressure pain threshold of the gastrocnemius muscle with latent trigger points. Twenty mixed martial arts athletes (MMA) were randomly divided into two groups: experimental (eDN, n = 10) and sham (qDN, n = 10) to undergo one session of DN either with a real or a qazi needle. The measurements were taken at rest, 1-5 minutes after the DN (Post1-5min) and 24h after the DN (Post24h). DN significantly increased the muscle perfusion (Post1-5min and Post24h, p < 0.001), reduced its tone (Post1-5min and Post24h, p < 0.001) and stiffness (Post1-5min, p < 0.05; Post24 h, p < 0.001), and improved its elasticity (Post1-5min and Post24h, p < 0.001). DN also caused a significant increase in pressure pain threshold (Post1-5min, p < 0.001; Post24h, p < 0.05) and in muscle power (Post24h, p < 0.01). The DN session increased the blood perfusion and improved the biomechanical properties of the gastrocnemius muscle, which led to improved muscle power. The DN also had an analgesic effect. These effects were maintained at 24 h, which suggests that DN could facilitate muscle recovery in a post-exercise period of MMA athletes.

Meta-epidemiologic review: blinding and sham treatment in clinical trial design for osteopathic manipulative treatment research

Objective

To analyze the consistency of study designs in osteopathic manipulative treatment (OMT) research, focusing on blinding protocols and the use of sham treatments.

Data Source and Study Selection

PubMed and CINAHL were searched in January 2022. A total of 83 research studies between 2009 and 2021 were selected based on the presence of a double- or single-blind study design and/or sham treatment.

Data Extraction and Analysis

Data regarding the primary outcome measures, blinding design, measures used to determine success of blinding, osteopathic technique used, and sham technique used for each eligible study were extracted and compared among different study designs.

Results

A total of 5968 subjects participated in the 83 trials. The study population mainly consisted of asymptomatic individuals (25%) and chronic back pain patients (19%). Light touch was employed most commonly (49%) as the sham treatment, followed by unrelated sham (20%) and incomplete maneuvers (20%). Most studies blinded the subjects (80%) or the outcome evaluator/data analyzer (71%), while only 20% studies blinded the osteopathic physicians.

Conclusions

Strict double-blinding is achievable for OMT clinical research by blinding the subjects and data collectors/analyzers rather than the osteopaths providing the actual treatment. The use of questionnaires to determine the success of blinding should be considered. Additionally, including OMT-naïve subjects is preferred to enhance blinding success. When designing a sham treatment, careful consideration should be given to blinding the data collector, accounting for the placebo effect, and incorporating an additional no-treatment control group to improve the rigor of the study design.

Design and testing the validity of an inexpensive and accessible sham dry needling protocol

OBJECTIVE

To use a simple method of needle blunting to produce a placebo dry needling protocol which is indistinguishable from the sensations felt during therapeutic dry needling.

METHODS

A randomised cross-over design was used to compare the perception of needle skin penetration, pain experienced and types of sensations experienced following a single placebo dry needling and a single therapeutic dry needling application.

RESULTS

There were no significant differences in the proportions of patients reported ability to perceive needle penetration (p = 0.646), description of needling sensations (p = 0.3) or pain rating (p = 0.405) when comparing placebo needling to therapeutic dry needling.

CONCLUSION

Needle tip bending creates a simple, cost-effective and effective placebo needle for use in comparisons with therapeutic dry needling. This offers researchers a viable alternative to expensive and inappropriate acupuncture sham devices when conducting dry needling trials.

Dry needling in a multimodal rehabilitation protocol following rotator cuff repair surgery: study protocol for a double-blinded randomized sham-controlled trial

BACKGROUND

Rotator cuff tear (RCT) is one of the main causes of shoulder pain and dysfunction. Rotator cuff repair (RCR) is a common surgical procedure for the management of RCTs. Presence of myofascial trigger points (MTrP) as a result of surgical procedure can aggravate postoperative shoulder pain. The purpose of this protocol is to describe a randomized controlled trial design to evaluate the effect of implementing 4 sessions of myofascial trigger point dry needling (MTrP-DN) within a multimodal rehabilitation protocol following RCR surgery.

METHODS

Forty-six participants aged 40-75 will be recruited having postoperative shoulder pain after RCR and meeting the inclusion criteria. Participants will be randomly divided into 2 groups: One group will undergo MTrP-DN, manual therapy, exercise therapy and electrotherapy and the other will receive sham dry needling (S-DN), manual therapy, exercise therapy and electrotherapy. This protocol will cover 4 weeks of intervention. The primary outcome measure will be the Numeric Pain Rating Scale (NPRS) for pain. Secondary outcome measures will be Shoulder Pain and Disability Index (SPDI), range of motion (ROM), strength and adverse events.

DISCUSSION

This is the first study to investigate the use of 4 sessions of MTrP-DN in combination with a multimodal rehabilitation protocol for postoperative shoulder pain, restriction, weakness and dysfunction following RCR. The results of this study may help to determine the effect of MTrP-DN on various outcomes after RCR surgery.

TRIAL REGISTRATION

This trial was registered at the ( https://www.irct.ir ), (IRCT20211005052677N1) on 19/2/2022.

Clinical Effectiveness of Dry Needling in Patients with Musculoskeletal Pain-An Umbrella Review

The number of systematic reviews (SR) summarizing the literature regarding the clinical effects of Dry Needling (DN) has increased rapidly. Yet, rigorous evidence about the clinical effectiveness of this technique is still lacking. The aim of this umbrella review is to summarize the evidence about the clinical effects of trigger point DN on musculoskeletal disorders across all body regions. PubMed, Web of Science and Embase were searched to identify SRs examining the effect of DN (as a stand-alone intervention or combined with another treatment modality) compared to sham/no intervention or a physical therapy (PT) intervention with at least one clinical outcome in the domain of pain or physical functioning. Risk of bias (RoB) was assessed with the AMSTAR-2 tool. Quantification of the overlap in primary studies was calculated using the corrected covered area (CCA). The electronic search yielded 2286 results, of which 36 SRs were included in this review. Overall, DN is superior to sham/no intervention and equally effective to other interventions for pain reduction at short-term regardless of the body region. Some SRs favored wet needling (WN) over DN for short-term pain reductions. Results on physical functioning outcomes were contradictory across body regions. Limited data is available for mid- and long-term effects. DN has a short-term analgesic effect in all body regions and may be of additional value to the interventions that are used to date in clinical practice. Several studies have shown an additional treatment effect when combining DN to physiotherapeutic interventions compared to these interventions in isolation. There is a substantial need for the standardization of DN protocols to address the problem of heterogeneity and to strengthen the current evidence.

Immediate effects of dry needling on pain sensitivity and pain modulation in patients with chronic idiopathic neck pain: a single-blinded randomized clinical trial

BACKGROUND

Dry needling is frequently used for the treatment of neck pain but knowledge about its neurophysiological central effects is scarce.

OBJECTIVES

To compare the immediate effects of a single session of dry needling (DN) and sham needling (SN) on local and distant pressure pain thresholds and conditioned pain modulation in patients with chronic idiopathic neck pain.

METHOD

Participants with chronic idiopathic neck pain were randomly allocated to a DN or SN group. The primary outcome measure was the pressure pain threshold (PPT) at one peripheral location: quadriceps muscle (Q). Secondary outcome measures were local PPTs at the treated (most painful) (tUT) and non-treated upper trapezius muscle (ntUT), absolute and relative conditioned pain modulation (CPM) effects and pain during hot water immersion. Patients were assessed at baseline and immediately post intervention. Linear mixed models were used to examine interaction effects as well as between- and within-group differences.

RESULTS

Fifty-four participants were included for statistical analysis. Linear mixed model analyses showed no significant "group X time" interaction effects for any of the outcome measures. The relative CPM effect at the Q was significantly higher post-intervention, compared to baseline within the DN group (mean difference= 13.52%; 95% CI: 0.46, 26.59).

CONCLUSION

The present study shows no superior effect of DN, compared to SN, in the immediate effect on local and distant PPTs and CPM in patients with chronic idiopathic neck pain.

Effectiveness of Dry Needling of Myofascial Trigger Points in the Triceps Surae Muscles: Systematic Review

This study aims to analyze the effects of Dry Needling (DN) for the release of myofascial trigger points (MTrPs) in the triceps surae muscles (TSM). A systematic review was performed up to February 2022 in PubMed, PEDro, Scopus, CENTRAL, and Web of Science. Selection criteria were studies involving subjects older than 18 years presenting MTrPs in the TSM, without any concomitant acute or chronic musculoskeletal conditions; DN interventions applied to the MTrPs of the TSM; and results on pain, range of motion (ROM), muscle strength, muscle stiffness, and functional outcomes. The PEDro scale was used to assess the methodological quality of the studies, and the Risk of Bias Tool 2.0 to assess risk of bias. A total of 12 studies were included in the systematic review, involving 426 participants. These results suggest that DN of MTrPs in TSM could have a positive impact on muscle stiffness and functional outcomes. There are inconclusive findings on musculoskeletal pain, ROM, and muscle strength. Significant results were obtained in favor of the control groups on pressure pain thresholds. Despite the benefits obtained on muscle stiffness and functional performance, the evidence for the use of DN of MTrPs in the TSM remains inconclusive.

Immediate Effects of Adding Dry Needling to Thoracic Manipulation and Exercise in Cervical Range of Motion for Adults With Neck Pain: A Randomized Clinical Trial

OBJECTIVE

The purpose of this study was to determine the immediate effects of adding dry needling (DN) to thoracic spine manipulation and neck-specific exercise in individuals with neck pain.

METHODS

Forty-two participants with neck pain were randomized to either the true (n = 21) or sham (n = 21) DN groups, receiving treatment on the initial visit and 2 to 3 days later. Outcomes were assessed on day 1, both at baseline and immediately after the initial treatment, at the second treatment 2 to 3 days later, and at the final visit 5 to 7 days after visit 2. Primary outcomes were Neck Disability Index (NDI) (0-50) and current pain via numeric pain rating scale (0-10). Secondary outcomes were cervical range of motion, pain pressure threshold, and global rating of change.

RESULTS

Repeated measures analysis of covariance with baseline value as covariate revealed no significant difference in NDI scores at either follow-up time point with adjusted mean differences (95% confidence interval) of -0.11 (-2.70 to 2.48) and 0.31 (-1.96 to 2.57). There were no between-group differences in pain at any time point via Independent-Samples Median Test (P value range of .54-1.0). Secondary outcome measures were similarly not statistically different between groups except for immediate improvements in rotation to the side opposite of pain, which favored DN, with an adjusted mean difference (95% confidence interval) of 7.85 (3.54-12.15) degrees.

CONCLUSION

The addition of DN to thoracic spinal manipulation and neck-specific exercise did not affect improvements in NDI score or numeric pain rating scale but showed an increase in cervical range of motion.

Effects of previous experience with dry needling therapy on blinding effectiveness and pain outcomes in people with neck pain: A preliminary sham-controlled study

BACKGROUND

Participants' previous experience with an intervention may be an important variable when conducting sham-controlled trials.

OBJECTIVE

This study explored if previous experience with dry needling (DN) influenced blinding effectiveness and pain outcomes, after the application of DN in patients with neck pain.

DESIGN

A preliminary randomized, sham-controlled study.

METHODS

Participants were randomized to receive a single session of real or sham DN. Previous experience with DN (yes/no) was recorded. Blinding effectiveness was assessed by asking participants to guess their group allocation (real/sham/not sure) 5 min post-intervention. Outcomes including pain intensity, pressure pain thresholds, and self-perceived improvement, were assessed by a blinded assessor at baseline, one- and seven-days post-intervention.

RESULTS

Of 50 patients recruited, 30 had previous experience and 20 did not. Fifty-seven percent (n = 17/30) with previous experience and 35% (n = 7/20) without experience correctly identified their group allocation, but this difference was not significant (χ² = 2.333; P = 0.127). No interaction between previous experience and clinical outcomes were found, except that participants with previous experience receiving real DN showed greater improvements in pain during cervical rotation than those without previous experience at one (Δ -11.5 mm 95%CI -22.0 to -1.0 mm) and seven days (Δ -8.5 mm, -16.00 to -1.0 mm) post-intervention.

CONCLUSIONS

Participants with previous experience were 22% more accurate at identifying their group allocation than those without experience, but the difference was not significant. Previous experience did not influence most clinical outcomes, except for pain intensity after real DN. Future studies evaluating effects of previous experience of DN should include more detailed information of previous experience.

The importance of the local twitch response during needling interventions in spinal pain associated with myofascial trigger points: a systematic review and meta-analysis

OBJECTIVE

To compare the clinical effects of needling interventions eliciting local twitch responses (LTRs) versus needling without eliciting LTRs when applied to muscle trigger points (TrPs) associated with spinal pain of musculoskeletal origin.

DATABASES AND DATA TREATMENT

Electronic databases were searched for randomized or non-randomized clinical trials where one group received needling intervention where LTRs were elicited and was compared with another group receiving the same intervention without elicitation of LTRs in spinal pain disorders associated with TrPs. Outcomes included pain intensity, pain-related disability, and pressure pain thresholds. The risk of bias (RoB) was assessed using the Cochrane risk of bias tool or ROBINS-I tool, methodological quality was assessed with the PEDro score, and quality of evidence was evaluated using the GRADE approach.

RESULTS

Six trials were included. The application of a needling intervention eliciting LTRs was associated with a significant reduction in pain intensity immediately after treatment (mean difference (MD): -2.03 points, 95% confidence interval (CI): -3.77 to -0.29; standardized MD (SMD): -1.35, 95% CI: -2.32 to -0.38, p = 0.02) when compared to the same needling intervention without elicitation of LTRs. No effect at short-term follow-up (MD: -0.20 points, 95% CI: -1.46 to 1.06, p = 0.75) was observed. No significant differences based on elicitation or non-elicitation of LTRs were found in related disability (SMD: -0.05, 95% CI: -0.41 to 0.30, p = 0.77) or pressure pain thresholds (MD: 23.39 kPa, 95% CI: -13.68 to 60.47, p = 0.22).

DISCUSSION

Low-level evidence suggests an immediate effect of obtaining LTRs during needling interventions on pain intensity, with no significant effects on related disability or pressure pain sensitivity in spinal pain disorders associated with muscle TrPs.

REGISTRATION NUMBER

OSF Registry-https://doi.org/10.17605/OSF.IO/5ZX9N.

Effects of dry needling of the obliquus capitis inferior on sensorimotor control and cervical mobility in people with neck pain: A double-blind, randomized sham-controlled trial

BACKGROUND

Impairments of sensorimotor control relating to head and eye movement control and postural stability are often present in people with neck pain. The upper cervical spine and particularly the obliquus capitis inferior (OCI) play an important proprioceptive role; and its impairment may alter cervical sensorimotor control. Dry needling (DN) is a valid technique to target the OCI.

OBJECTIVES

To investigate if a single DN session of the OCI muscle improves head and eye movement control-related outcomes, postural stability, and cervical mobility in people with neck pain.

METHODS

Forty people with neck pain were randomly assigned to receive a single session of DN or sham needling of the OCI. Cervical joint position error (JPE), cervical movement sense, standing balance and oculomotor control were examined at baseline, immediately post-intervention, and at one-week follow-up. Active cervical rotation range of motion and the flexion rotation test were used to examine the global and upper cervical rotation mobility, respectively.

RESULTS

Linear mixed-models revealed that the DN group showed a decrease of JPE immediately post-intervention compared to the sham group (mean difference [MD]= -0.93°; 95% confidence interval [CI]: -1.85, -0.02) which was maintained at one-week follow-up (MD= -1.64°; 95%CI: -2.85, -0.43). No effects on standing balance or cervical movement sense were observed in both groups. Upper cervical mobility showed an increase immediately after DN compared to the sham group (MD= 5.14°; 95%CI: 0.77, 9.75) which remained stable at one-week follow-up (MD= 6.98°; 95%CI: 1.31, 12.40). Both group showed an immediate increase in global cervical mobility (MD= -0.14°; 95%CI: -5.29, 4.89).

CONCLUSION

The results from the current study suggest that a single session of DN of the OCI reduces JPE deficits and increases upper cervical mobility in patients with neck pain. Future trials should examine if the addition of this technique to sensorimotor control training add further benefits in the management of neck pain.

A novel blinding protocol to test participant and therapist blinding during dry needling: a randomised controlled experiment

OBJECTIVES

Dry needling is widely used in physiotherapy. Lack of blinding in clinical trials means that dry needling effects and mechanisms remain unclear, with blinding issues accepted as an unavoidable barrier to better evidence. The authors aimed to overcome this barrier by designing a protocol to double-blind dry needling trials.

DESIGN

A prospectively registered randomised experiment tested a novel blinding protocol for blinding effectiveness.

SETTING

University physiotherapy clinic.

PARTICIPANTS

Therapists (n=15) and asymptomatic volunteers ('recipients') (n=45) were randomly allocated to real and/or sham interventions.

INTERVENTIONS

The protocol involved custom-made needles and cognitive and multisensory blinding techniques.

MAIN OUTCOME MEASURES

The primary outcome was guesses about allocation. The a priori criterion for successful blinding was ≤50% correct guesses (random chance). Secondary analyses explored blinding patterns using blinding indices.

RESULTS

Correct guesses were not different from 50% for therapists [41% (95%CI 30 to 50), n=120 guesses] or recipients [49% (95%CI 38 to 60), n=90 guesses]. Blinding indices supported the primary result but revealed that recipients were better at detecting real dry needling than sham.

CONCLUSION

Both therapists and recipients were successfully blinded, which contrasts with the widely held assumption that double-blinding is impossible for needling interventions. The authors recommend that any future trials can, and therefore should, blind therapists. However, secondary analyses revealed that recipients receiving real dry needling were less blinded than sham recipients, which may still create bias in clinical trials and suggests further work is needed to improve recipient blinding. Nonetheless, the current findings offer an opportunity to gain better evidence concerning the effects and mechanisms of dry needling.

STUDY REGISTRATION

https://osf.io/rkzeb/.

A collaborative experiential problem-solving approach to develop shams for complex physical interventions: a case study of dry needling

OBJECTIVE

Complex physical interventions are widely used in physiotherapy, despite doubts over the validity of clinical trial results due to lack of credible shams. Credible shams are critically needed, so too, therefore, is a process by which they can be developed. The authors used a novel methodology to develop and test blinding protocols for dry needling, a complex physical intervention for which blinding is particularly difficult.

DESIGN

The research design was a practical three-day workshop influenced by Participatory Action Research, which uses iteration and reflection to solve a problem.

PARTICIPANTS

Five multidisciplinary experts (researchers, clinicians, technician, magician) were invited. Healthy volunteers ('recipients', n=17) and accredited physiotherapists (n=6) were recruited to enable testing of blinding strategies.

MAIN OUTCOME MEASURES

Primary outcomes were expert opinion on the potential to blind recipients/therapists for (1) individual blinding strategies, and (2) entire blinding protocols. Secondary outcomes included recipient/therapist blinding effectiveness and acceptability.

RESULTS

Experts iteratively developed 11 blinding protocols involving 22 blinding strategies. Experts rated 18 of the blinding strategies to 'definitely have potential' and identified four categories: knowledge of the sham, clinical interaction, disinformation, and sensation. Recipient and therapist blinding became more successful as the protocols evolved.

CONCLUSIONS

Credible shams capable of simultaneous recipient and therapist blinding have been regarded to be impossible in dry needling. The preliminary success of the devised protocols suggest that our novel approach may be a crucial step in sham development. Improvements in expert rankings and blinding effectiveness as the protocols progressed support the value of this workshop approach.

Immediate Effects of Dry Needling on the Autonomic Nervous System and Mechanical Hyperalgesia: A Randomized Controlled Trial

BACKGROUND

Dry needling (DN) is often used for the treatment of muscle pain among physiotherapists. However, little is known about the mechanisms of action by which its effects are generated. The aim of this randomized controlled trial was to determine if the use of DN in healthy subjects activates the sympathetic nervous system, thus resulting in a decrease in pain caused by stress.

METHODS

Sixty-five healthy volunteer subjects were recruited from the University of Alcala, Madrid, Spain, with an age of 27.78 (SD = 8.41) years. The participants were randomly assigned to participate in a group with deep DN in the adductor pollicis muscle or a placebo needling group. The autonomic nervous system was evaluated, in addition to local and remote mechanical hyperalgesia.

RESULTS

In a comparison of the moment at which the needling intervention was carried out with the baseline, the heart rate of the dry needling group significantly increased by 20.60% (SE = 2.88), whereas that of the placebo group increased by 5.33% (SE = 2.32) (p = 0.001, d = 1.02). The pressure pain threshold showed significant differences between both groups, being significantly higher in the needling group (adductor muscle p = 0.001; d = 0.85; anterior tibialis muscle p = 0.022, d = 0.58).

CONCLUSIONS

This work appears to indicate that dry needling produces an immediate activation in the sympathetic nervous system, improving local and distant mechanical hyperalgesia.

Blinding, sham, and treatment effects in randomized controlled trials for back pain in 2000-2019: A review and meta-analytic approach

BACKGROUND

Blinding aims to minimize biases from what participants and investigators know or believe. Randomized controlled trials, despite being the gold standard to evaluate treatment effect, do not generally assess the success of blinding. We investigated the extent of blinding in back pain trials and the associations between participant guesses and treatment effects.

METHODS

We did a review with PubMed/OvidMedline, 2000-2019. Eligibility criteria were back pain trials with data available on treatment effect and participants' guess of treatment. For blinding, blinding index was used as chance-corrected measure of excessive correct guess (0 for random guess). For treatment effects, within- or between-arm effect sizes were used. Analyses of investigators' guess/blinding or by treatment modality were performed exploratorily.

RESULTS

Forty trials (3899 participants) were included. Active and sham treatment groups had mean blinding index of 0.26 (95% confidence interval: 0.12, 0.41) and 0.01 (-0.11, 0.14), respectively, meaning 26% of participants in active treatment believed they received active treatment, whereas only 1% in sham believed they received sham treatment, beyond chance, that is, random guess. A greater belief of receiving active treatment was associated with a larger within-arm effect size in both arms, and ideal blinding (namely, "random guess," and "wishful thinking" that signifies both groups believing they received active treatment) showed smaller effect sizes, with correlation of effect size and summary blinding indexes of 0.35 (p = 0.028) for between-arm comparison. We observed uniformly large sham treatment effects for all modalities, and larger correlation for investigator's (un)blinding, 0.53 (p = 0.046).

CONCLUSION

Participants in active treatments in back pain trials guessed treatment identity more correctly, while those in sham treatments tended to display successful blinding. Excessive correct guesses (that could reflect weaker blinding and/or noticeable effects) by participants and investigators demonstrated larger effect sizes. Blinding and sham treatment effects on back pain need due consideration in individual trials and meta-analyses.

Dry Needling for the Treatment of Tension-Type, Cervicogenic, or Migraine Headaches: A Systematic Review and Meta-Analysis

OBJECTIVE

Dry needling is a treatment technique used by clinicians to relieve symptoms in patients with tension-type headache (TTH), cervicogenic headache (CGH), or migraine. This systematic review's main objective was to assess the effectiveness of dry needling on headache pain intensity and related disability in patients with TTH, CGH, or migraine.

METHODS

Medline/PubMed, Scopus, Embase, PEDro, Web of Science, Ovid, Allied and Complementary Medicine Database/EBSCO, Cochrane Central Register of Controlled Clinical Trials, Google Scholar, and trial registries were searched until April 1, 2020, along with reference lists of eligible studies and related reviews. Randomized clinical trials or observational studies that compared the effectiveness of dry needling with any other interventions were eligible for inclusion. Three reviewers independently selected studies, extracted data, and assessed risk of bias. Random-effects meta-analyses were performed to produce pooled-effect estimates (Morris dppc2) and their respective CIs.

RESULTS

Of 2715 identified studies, 11 randomized clinical trials were eligible for qualitative synthesis and 9 for meta-analysis. Only 4 trials were of high quality. Very low-quality evidence suggested that dry needling is not statistically better than other interventions for improving headache pain intensity in the short term in patients with TTH (SMD -1.27, 95% CI = -3.56 to 1.03, n = 230), CGH (SMD -0.41, 95% CI = -4.69 to 3.87, n = 104), or mixed headache (TTH and migraine; SMD 0.03; 95% CI = -0.42 to 0.48, n = 90). Dry needling provided significantly greater improvement in related disability in the short term in patients with TTH (SMD -2.28, 95% CI = -2.66 to -1.91, n = 160) and CGH (SMD -0.72, 95% CI = -1.09 to -0.34, n = 144). The synthesis of results showed that dry needling could significantly improve headache frequency, health-related quality of life, trigger point tenderness, and cervical range of motion in TTH and CGH.

CONCLUSIONS

Dry needling produces similar effects to other interventions for short-term headache pain relief, whereas dry needling seems to be better than other therapies for improvement in related disability in the short term.

IMPACT

Although further high-methodological quality studies are warranted to provide a more robust conclusion, our systematic review suggested that for every 1 or 2 patients with TTH treated by dry needling, 1 patient will likely show decreased headache intensity (number needed to treat [NNT] = 2; large effect) and improved related disability (NNT = 1; very large effect). In CGH, for every 3 or 4 patients treated by dry needling, 1 patient will likely exhibit decreased headache intensity (NNT = 4; small effect) and improved related disability (NNT = 3; medium effect).

Effects of Dry Needling on Muscle Stiffness in Latent Myofascial Trigger Points: A Randomized Controlled Trial

The aim of this study was to analyze the effects of dry needling (DN) in upper trapezius latent trigger points (LTrPs) on muscle stiffness. A total of 51 recreational physically active subjects with LTrPs in the upper trapezius volunteered to participate and were randomly divided into a DN-group (n = 27) and a sham-DN group (n = 24). Volunteers received 1-session of DN or placebo treatment. Muscle stiffness, measured with strain and shear-wave elastography, pressure pain threshold (PPT), post-needling soreness, and muscle thickness were evaluated before treatment, and at 30-min, 24-hours, and 72-hours follow-up after treatment. The DN-group showed lower values from baseline for muscle stiffness measured with shear-wave elastrography at 24-hours (from 44.44 ± 15.97 to 35.78 ± 11.65 kpa; P < .01) and at 72-hours (35.04 ± 12.61 kpa; P < .01) and with strain elastography at 72-hours (from 1.75 ± 0.50 to 1.36 ± 0.40 AU; P < .01). The DN-group showed higher values of PPT than the sham-DN group at 72-hours (4.23 ± 0.75 vs. 5.19 ± 1.16 kg/cm²; P < .05). There was a progressive decrease in post-needling soreness compared to pain during needling of 33.13 ± 21.31% at 30-min, 80.92 ± 10.06% at 24-hours, and a total decrease in post-needling soreness in all participants at 72-hours. DN therapy is effective in reducing short-term muscle stiffness and increasing the PPT in volunteers with LTrPs in the upper trapezius after a treatment session. PERSPECTIVE: This study found that one session of DN intervention in latent trigger points of the upper trapezius muscle reduced muscle stiffness and the pressure pain threshold for the dry needling group compared to the sham dry needling group.

Effects of Trigger Point Dry Needling for Nontraumatic Shoulder Pain of Musculoskeletal Origin: A Systematic Review and Meta-Analysis

OBJECTIVE

The purpose of this study was to evaluate the effects of trigger point (TrP) dry needling alone or as an adjunct to other interventions on pain intensity and related disability in nontraumatic shoulder pain.

METHODS

Ten databases were searched from inception to January 2020 for randomized clinical trials in which at least 1 group received TrP dry needling for shoulder pain of musculoskeletal origin with outcomes collected on pain intensity and related disability. Data extraction including participant and therapist details, interventions, blinding strategy, blinding assessment outcomes, and results were extracted by 2 reviewers. The risk of bias (Cochrane Risk of Bias, Cochrane Guidelines), methodological quality (Physiotherapy Evidence Database score), and evidence level (Grading of Recommendations Assessment, Development, and Evaluation approach) were assessed. The search identified 551 publications with 6 trials eligible for inclusion.

RESULTS

There was moderate-quality evidence that TrP dry needling reduces shoulder pain intensity with a small effect (mean difference = -0.49 points, 95% CI = -0.84 to -0.13; standardized mean difference = -0.25, 95% CI = -0.42 to -0.09) and low-quality evidence that TrP dry needling improves related disability with a large effect (mean difference = -9.99 points, 95% CI -15.97 to -4.01; standardized mean difference = -1.14, 95% CI -1.81 to -0.47) compared with a comparison group. The effects on pain were only found at short term. The Cochrane Risk of Bias was generally low, but the heterogenicity of the results downgraded the evidence level.

CONCLUSION

Moderate- to low-quality evidence suggests positive effects of TrP dry needling for pain intensity (small effect) and pain-related disability (large effect) in nontraumatic shoulder pain of musculoskeletal origin, mostly at short term. Future clinical trials investigating long-term effects are needed.

IMPACT

Dry needling is commonly used for the management of musculoskeletal pain. This is the first meta-analysis to examine the effects of dry needling on nontraumatic shoulder pain.

Is Dry Needling Effective for the Management of Spasticity, Pain, and Motor Function in Post-Stroke Patients? A Systematic Review and Meta-Analysis

OBJECTIVE

To evaluate the effects of muscle dry needling alone or combined with other interventions on post-stroke spasticity (muscle tone), related pain, motor function, and pressure sensitivity.

DATABASES AND DATA TREATMENT

Electronic databases were searched for randomized controlled trials including post-stroke patients where at least one group received dry needling and outcomes were collected on spasticity and related pain. Secondary outcomes included motor function and pressure pain sensitivity. Data were extracted by two reviewers. The risk of bias was assessed with the Cochrane Risk of Bias tool, methodological quality was assessed with the Physiotherapy Evidence Database score, and the quality of evidence was assessed by the Grading of Recommendations Assessment, Development, and Evaluation approach. Between-groups mean differences (MDs) and standardized mean differences (SMDs) were calculated.

RESULTS

Seven studies (three within the lower extremity, four in the upper extremity) were included. The meta-analysis found significantly large effect sizes of dry needling for reducing spasticity (SMD: -1.01, 95%confidence interval [CI] -1.68 to -0.34), post-stroke pain (SMD -1.01, 95%CI -1.73 to -0.30), and pressure pain sensitivity (SMD 1.21, 95% CI: 0.62 to 1.80) as compared with a comparative group at short-term follow-up. The effect on spasticity was found mainly in the lower extremity (MD -1.05, 95% CI: -1.32 to -0.78) at short-term follow-up. No effect on spasticity was seen at 4 weeks. No significant effect on motor function (SMD 0.16, 95% CI: -0.13 to 0.44) was observed. The risk of bias was generally low, but the imprecision of the results downgraded the level of evidence.

CONCLUSION

Moderate evidence suggests a positive effect of dry needling on spasticity (muscle tone) in the lower extremity in post-stroke patients. The effects on related pain and motor function are inconclusive.

Benefits of Adding Gluteal Dry Needling to a Four-Week Physical Exercise Program in a Chronic Low Back Pain Population. A Randomized Clinical Trial

OBJECTIVE

To determine if adding dry needling to a four-week exercise program has an additional benefit compared with adding sham dry needling to the same exercise program in subjects with chronic low back pain.

DESIGN

Randomized clinical trial.

SETTING

Physiotherapy and Pain Clinic of Alcala University.

SUBJECTS

Forty-six patients with chronic low back pain.

METHODS

Subjects were randomized to two groups: the dry needling group (N = 23) or sham dry needling group (N = 23). Both groups received a four-week exercise program and before the exercise started a session of dry needling or sham dry needling. Pain (visual analog scale), disability (Roland-Morris Questionnaire), and fear avoidance beliefs (Fear Avoidance Beliefs Questionnaire) were assessed at baseline, after treatment, and at three-month follow-up. Pressure pain thresholds (algometer) were measured at baseline, after the dry needling or the sham dry needling, and after treatment.

RESULTS

Both groups showed significant improvements for all variables. In the between-group comparison, the dry needling group improved significantly in pain at three-month follow-up and pressure pain thresholds at the end of treatment for all measures, and at three-month follow-up there was no improvement in gluteus medium.

CONCLUSIONS

In chronic low back patients, adding dry needling to a four-week exercise program has an additional benefit in pain and sensitivity compared with adding sham dry needling to the same exercise program.

The effect of dry needling on gastrocnemius muscle stiffness and strength in participants with latent trigger points

Abnormal muscle stiffness is a potential complication after injury and identifying interventions that modify muscle stiffness may be useful to promote recovery. The purpose of this study was to identify the short-term effects of dry needling (DN) on resting and contracted gastrocnemius muscle stiffness and strength of the triceps surae in individuals with latent myofascial trigger points (MTrPs). In this randomized controlled trial, 52 individuals received two DN treatment sessions to latent MTrPs and 50 individuals received two sham needling sessions. Resting and contracted muscle stiffness were assessed both at the treatment site and a standardized central site in the medial gastrocnemius head immediately post-treatment and one week after the last session. There were significant group by time interactions for resting muscle stiffness at the site of the MTrP (p = .03), but not at the central site (p = .29). Post-needling between group comparison indicated that the DN group had significantly lower resting muscle stiffness at the site of the MTrP than the sham group after adjusting for baseline differences. There were no significant between group differences in contracted muscle stiffness or muscle strength. Identifying strategies that can reduce aberrant muscle stiffness may help to guide management of individuals with neuromuscular pain-related conditions. Level of evidence: Therapy, level 2.

Effectiveness of Dry Needling in the Management of Spasticity in Patients Post Stroke

OBJECTIVE

To determine the effectiveness of the dry needling technique (DNT) in the treatment of spasticity for individuals with stroke.

DESIGN

We reviewed the Embase, Pubmed/MEDLINE, Web of Science and Cochrane Central Register of Controlled Trials (CENTRAL) databases. We also performed a manual search of the references that are included in the selected articles. Studies included were: i) randomized clinical trials (RCTs); ii) involving patients with a diagnosis of stroke; and iii) using DNT alone or in a multimodal treatment. Muscular spasticity was the primary outcome of the study. The additional outcomes included were: pressure pain sensitivity, range of motion and perception of pain. The analysis of the certainty of the evidence was analyzed using GRADE. The risk of bias of the included studies was assessed with the Cochrane Risk of Bias Tool for Randomized Controlled Trials.

RESULTS

A total of six RCTs with 221 patients were included in this systematic review, where a significant decrease in spasticity was observed in most of the muscles evaluated, though the certainty of the evidence was low. The effects were only evaluated in the short term in all included studies and the sample size was small.

CONCLUSION

These results should be taken with caution because the included studies are few in number and have different comparators. More RCTs are needed to cover aspects of biases found in the literature, in particular the blinding of participants and personnel.

Effectiveness of Dry Needling for Myofascial Trigger Points Associated with Neck Pain Symptoms: An Updated Systematic Review and Meta-Analysis

Our aim was to evaluate the effect of dry needling alone as compared to sham needling, no intervention, or other physical interventions applied over trigger points (TrPs) related with neck pain symptoms. Randomized controlled trials including one group receiving dry needling for TrPs associated with neck pain were identified in electronic databases. Outcomes included pain intensity, pain-related disability, pressure pain thresholds, and cervical range of motion. The Cochrane risk of bias tool and the Physiotherapy Evidence Database (PEDro) score were used to assessed risk of bias (RoB) and methodological quality of the trials. The quality of evidence was assessed by using the Grading of Recommendations Assessment, Development, and Evaluation (GRADE) approach. Between-groups mean differences (MD) and standardized mean differences (SMD) were calculated (3) Twenty-eight trials were finally included. Dry needling reduced pain immediately after (MD −1.53, 95% CI −2.29 to −0.76) and at short-term (MD −2.31, 95% CI −3.64 to −0.99) when compared with sham/placebo/waiting list/other form of dry needling and, also, at short-term (MD −0.51, 95% CI −0.95 to −0.06) compared with manual therapy. No differences in comparison with other physical therapy interventions were observed. An effect on pain-related disability at the short-term was found when comparing dry needing with sham/placebo/waiting list/other form of dry needling (SMD −0.87, 95% CI −1.60 to −0.14) but not with manual therapy or other interventions. Dry needling was effective for improving pressure pain thresholds immediately after the intervention (MD 55.48 kPa, 95% CI 27.03 to 83.93). No effect on cervical range of motion of dry needling against either comparative group was found. No between-treatment effect was observed in any outcome at mid-term. Low to moderate evidence suggests that dry needling can be effective for improving pain intensity and pain-related disability in individuals with neck pain symptoms associated with TrPs at the short-term. No significant effects on pressure pain sensitivity or cervical range of motion were observed.

Dry needling for the management of spasticity, pain, and range of movement in adults after stroke: A systematic review

OBJECTIVE

To summarise the available evidence about the effectiveness of deep dry needling (DN) on spasticity, pain-related outcomes, and range-of-movement (ROM) in adults after stroke.

DESIGN

A computer search of Web of Science, Scopus, Medline, Cochrane Library, Cinahl, and Physiotherapy Evidence Database (PEDro) was conducted. A hand search of the reference lists of the selected studies and other relevant publications was also undertaken. Studies were assessed by two independent reviewers and included if they complied with the following criteria: (1) participants were adults after a stroke, (2) use of DN alone or within a multimodal approach, compared to no intervention or other treatments; (3) assessment of spasticity, pain, or joint ROM as a primary or secondary outcome. We included randomised controlled trials (RCTs), case series, and case reports. Data were extracted using a standardised protocol. The methodological quality of the studies was assessed with the Checklist for Measuring quality.

RESULTS

A total of sixteen studies, 7 of which were RCTs, were selected. All studies generally reported an improvement of spasticity level, pain intensity, and ROM after the use of DN, alone or combined with other interventions, in stroke survivors.

CONCLUSION

The management of adults after stroke with DN may impact positively on spasticity, pain, and ROM. However, there was significant heterogeneity across trials in terms of sample size, control groups, treated muscles, and outcome measures, and a meta-analysis was not feasible. Further research should include proper blinding, sham placebo DN as control intervention, and investigate long-term effects.

Effects of Trigger Point Dry Needling for the Management of Knee Pain Syndromes: A Systematic Review and Meta-Analysis

Background: To evaluate the effect of trigger point dry needling alone or as an adjunct with other interventions on pain and related disability in people with knee pain. Methods: Several electronic databases were searched for randomized controlled trials where at least one group received dry needling for knee pain. Studies had to include human subjects and collect outcomes on pain and pain-related disability in musculoskeletal knee pain. Data were extracted by two reviewers. The risk of bias was assessed by the Cochrane Guidelines, methodological quality was assessed with the Physiotherapy Evidence Database (PEDro) score, and the quality of evidence by using the GRADE approach. Standardized mean differences (SMD) were calculated. Results: Ten studies (six patellofemoral pain, two knee osteoarthritis, two post-surgery knee pain) were included. The meta-analysis found moderate effect sizes of dry needling for reducing pain (SMD −0.53, 95% CI −0.87 to −0.19) and improving related disability (SMD −0.58, 95% CI −1.08 to −0.09) as compared to a comparison group at short-term. The main effect was observed for patellofemoral pain (SMD −0.64, 95% CI −1.17 to −0.11). No significant effects were observed at mid- or long-term follow-ups. The risk of bias was generally low, but the heterogenicity and the imprecision of the results downgraded the level of evidence. Conclusion: Low to moderate evidence suggests a positive effect of trigger point dry needling on pain and related disability in patellofemoral pain, but not knee osteoarthritis or post-surgery knee pain, at short-term. More high-quality trials investigating long-term effects are clearly needed.

Effects of trigger point dry needling on lateral epicondylalgia of musculoskeletal origin: a systematic review and meta-analysis

OBJECTIVE

This meta-analysis evaluated the effect of dry needling alone or combined with other treatment interventions on pain, related-disability, pressure pain sensitivity, and strength in people with lateral epicondylalgia of musculoskeletal origin.

DATA SOURCES

MEDLINE, CINAHL, PubMed, PEDro, Cochrane Library, SCOPUS and Web of Science databases from their inception to 5 April 2020.

REVIEW METHODS

Randomized controlled trials collecting outcomes on pain, related-disability, pressure pain thresholds, or strength where one group received dry needling for lateral epicondylalgia of musculoskeletal origin. The risk of bias was assessed by the Cochrane Guidelines, methodological quality was assessed with the PEDro score, and the quality of evidence by using the GRADE approach.

RESULTS

Seven studies including 320 patients with lateral epicondylalgia were included. The meta-analysis found that dry needling reduced pain intensity (SMD ‒1.13, 95%CI ‒1.64 to ‒0.62) and related-disability (SMD ‒2.17, 95%CI ‒3.34 to ‒1.01) with large effect sizes compared to a comparative group. Dry needling also increased pressure pain thresholds with a large effect size (SMD 0.98, 95%CI 0.30 to 1.67) and grip strength with a small size effect (SMD 0.48, 95%CI 0.16 to 0.81) when compared to a comparative group. The most significant effect was at short-term. The risk of bias was generally low, but the heterogenicity of the results downgraded the evidence level.

CONCLUSION

Low to moderate evidence suggests a positive effect of dry needling for pain, pain-related disability, pressure pain sensitivity and strength at short-term in patients with lateral epicondylalgia of musculoskeletal origin.

LEVEL OF EVIDENCE

Therapy, level 1a.

REGISTRATION NUMBER

OSF Registry - https://doi.org/10.17605/OSF.IO/ZY3E8.

Towards more credible shams for physical interventions: A Delphi survey

BACKGROUND/AIMS

In clinical trials of physical interventions, participant blinding is often poorly addressed and therapist blinding routinely omitted. This situation presents a substantial barrier to moving the field forward. Improving the success of blinding will be a vital step towards determining the true mechanisms of physical interventions. We used a Delphi approach to identify important elements of shams for physical interventions to maximise the likelihood of participant and therapist blinding in clinical trials.

METHODS

Two expert groups were recruited: (1) experts in research methodology and (2) experts in deceptive and/or hypnotic techniques including magic. Magicians were included because they were considered a potentially rich source of innovation for developing credible shams due to their unique skills in altering perceptions and beliefs. Three rounds of survey were conducted, commencing with an open-ended question. Responses were converted to single 'items', which participants rated in the following two rounds using a 9-point Likert scale, categorised as 'Not important' (0-3), 'Depends' (4-6) and 'Essential' (7-9). Consensus was pre-defined as ≥80% agreement within a 3-point category.

RESULTS

Thirty-eight experts agreed to participate (research methodology: n = 22; deceptive and/or hypnotic techniques: n = 16), and 30 experts responded to at least one round (research methodology: n = 19; deceptive and/or hypnotic techniques: n = 11). Of 79 items, five reached consensus in the 'Essential' category in both groups, which related to beliefs of participants (n = 3 items), interactions with researchers (n = 1 item) and standardisation of clinical assessments (n = 1 item). Thirteen additional items reached consensus in the 'Essential' category in one group. Experts in research methodology had one additional item reach consensus, related to authentic delivery of study information. The remaining 12 additional items that reached consensus in the deceptive and/or hypnotic techniques group related mainly to therapist attitude and behaviour and the clinical interaction.

CONCLUSION

Experts agreed that, for shams to be believable, consideration of cognitive influences is essential. Contrary to the focus of previous shams for physical interventions, replicating the tactile sensation of the active treatment was not considered an essential part of sham development. Therefore, when designing sham-controlled clinical trials, researchers should carefully consider the cognitive credibility of the entire intervention experience, and not just the indistinguishability of the sham intervention itself. The findings provide new guidance to researchers on important contributors to blinding in physical intervention trials.