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Neck pain is a costly and common problem. Current treatments are not adequately effective for a large proportion of patients who continue to experience recurrent pain. Therefore, new treatment strategies should be investigated in an attempt to reduce the disability and high costs associated with neck pain. Dry needling is a technique in which a fine needle is used to penetrate the skin, subcutaneous tissues, and muscle with the intent to mechanically disrupt tissue without the use of an anesthetic. Dry needling is emerging as a treatment modality that is widely used clinically to address a variety of musculoskeletal conditions. Recent studies of dry needling in mechanical neck pain suggest potential benefits, but do not utilize methods typical to clinical practice and lack long-term follow-up. Therefore, a clinical trial with realistic treatment time frames and methods consistent with clinical practice is needed to examine the effectiveness of dry needling on reducing pain and enhancing function in patients presenting to physical therapy with mechanical neck pain.
The aim of this trial will be to examine the short- and long-term effectiveness of dry needling delivered by a physical therapist on pain, disability, and patient-perceived improvements in patients with mechanical neck pain.
We will conduct a randomized, double-blind, placebo-controlled trial in accordance with the CONSORT guidelines. A total of 76 patients over the age of 18 with acute or chronic mechanical neck pain resulting from postural dysfunction, trauma, or insidious onset who are referred to physical therapy will be enrolled after meeting the eligibility criteria. Subjects will be excluded if they have previous history of surgery, whiplash in the last 6 weeks, nerve root compression, red flags, or contraindications to dry needling or manual therapy. Participants will be randomized to receive (1) dry needling, manual therapy, and exercise or (2) sham dry needling, manual therapy, and exercise. Participants will receive seven physical therapy treatments lasting 45 minutes each over a maximum of 4 weeks. The primary outcome will be disability as measured by the Neck Disability Index. Secondary outcomes include the following: pain, patient-perceived improvement, patient expectations, and successful blinding to the needling intervention. Outcome measures will be assessed at 4 weeks, 6 months, and 12 months by an assessor who is blind to the group allocation of the participants to determine the short- and long-term treatment effects. We will examine the primary aim with a two-way, repeated-measures analysis of variance with treatment group as the between-subjects variable and time as the within-subjects variable. The hypothesis of interest will be the two-way group by time interaction. An a priori alpha level of .05 will be used for all analyses.
Recruitment is currently underway and is expected to be completed by the end of 2017. Data collection for long-term outcomes will occur throughout 2017 and 2018. Data analysis, preparation, and publication submission is expected to occur throughout the final three quarters of 2018.
The successful completion of this trial will provide evidence to demonstrate whether dry needling is effective for the management of mechanical neck pain when used in a combined treatment approach, as is the common clinical practice.
ClinicalTrials.gov NCT02731014; https://clinicaltrials.gov/ct2/show/NCT02731014 (Archived by WebCite at http://www.webcitation.org/6ujZgbhsq)
Neck pain is common, with 30%-50% of the population afflicted in a given year [
Commonly, physical therapists utilize patient education, exercise, mobilization, manipulation, massage, and electrophysical modalities when treating patients with mechanical neck pain. Yet the most recent Cochrane reviews on patient education [
Dry needling has emerged as a treatment modality that is widely used in the clinical environment to address a variety of musculoskeletal conditions including neck pain [
Most commonly, dry needling targets myofascial trigger points (MTrPs), which are described as localized hypersensitive spots in a palpable taut band of muscle [
There have been five recent studies examining dry needling performed by a physical therapist for patients with neck pain. Four of the trials examined the short-term effectiveness of dry needling: three in chronic mechanical neck pain [
Recent systematic reviews suggest that dry needling can be recommended in the short and medium term to reduce neck and shoulder pain [
The majority of the studies included in the recent reviews compared dry needling to control, sham, or to another intervention directly. Not only is this not consistent with how dry needling is commonly used clinically by physical therapists, but emerging evidence suggests that dry needling, when performed in combination with other interventions, may be more effective at reducing lower back pain than when performed alone [
The majority of existing studies lack adequate sample sizes, only collect short-term outcomes, frequently examine dry needling as a stand-alone intervention, and only treat one muscle for one to two sessions, which is not consistent with how dry needling is commonly performed clinically. Typically, clinicians will perform an examination to locate active and latent MTrPs and needle numerous active trigger points in a single session. They may then dry needle the patient over many sessions to achieve optimal effects. With the high prevalence of neck pain and its contribution to prolonged disability in patients, it is essential to identify optimal treatment approaches [
We hypothesize that patients who receive dry needling, manual therapy, and exercise will achieve greater reductions in pain and disability in the short term (ie, 4 weeks) and long term (ie, 6 and 12 months) compared to those who receive sham dry needling, manual therapy, and exercise.
We will conduct a randomized, double-blind, placebo-controlled trial according to the CONSORT guidelines (see
Flowchart of the study trial.
Each physical therapy clinic, upon receiving a patient referral for neck pain, attempts to schedule the patient with the therapists who have agreed to assess and treat participants in the trial. Upon arrival for their initial assessments, patients are informed about the potential opportunity to participate in the study if they meet inclusion/exclusion criteria. A combination of physical examination and self-report measures will be used to assess each patient’s potential eligibility to participate. Inclusion criteria for the study include the following: aged 18 years or older, a primary complaint of neck pain, and a Neck Disability Index (NDI)>10 points=20% [
If a patient is determined to have met inclusion/exclusion criteria, they will be asked if they would like to participate in the study. If they choose to provide informed consent, each patient will complete the baseline questionnaires as well as the baseline outcome assessments. Demographic information will be collected for descriptive purposes, including age, gender, employment status, past medical history, mechanism of injury, location and nature of the patient’s symptoms, number of days since onset, number of previous episodes of neck pain, and treatment for previous episodes. Once patients are admitted to the study, no patient will be removed from the study for noncompliance and an intention-to-treat analysis will be used.
All subjects will complete several commonly used instruments to assess their level of disability and neck pain. The primary outcome measure will be the NDI to capture the effect of treatment on the level of disability. Secondary outcome measures will include the Visual Analog Scale (VAS) to assess pain, the Global Rating of Change Scale (GROC) to measure the patient’s perceived recovery, the patient perception of the intervention to determine if they felt they received the genuine dry needling intervention, and patient expectations to determine which treatments they believed would be most beneficial for their current condition. The self-report measures that will be used include those discussed in the following sections.
The NDI was created to measure pain-related disability associated with activities of daily living in people with neck pain [
The VAS is a single-item measure of pain using a 100-mm horizontal line anchored on the left side, which represents
The GROC will be used, which is a 15-point global rating scale described by Jaeschke et al [
Patient perceptions about the intervention will be used to determine whether the sham was an effective placebo. Patients will be asked for their perceptions on the dry needling intervention they received in order to determine if they felt they received genuine treatment. The following questions will be asked: What did you think of the dry needling intervention? Would you be willing to have the dry needling intervention again if you were attending physical therapy? Do you think you received the real dry needling intervention?
Patient expectations will be assessed at enrollment into the trial. Patients will be asked to rate each intervention on a 5-point Likert scale as to whether they believe each specific intervention will significantly help to improve this episode of their neck pain.
All outcome assessments will be performed by an individual blind to group assignment and will be performed at baseline, 4 weeks, 6 months, and 12 months. The latter two assessments will be mailed to the patients to improve return rate (see
Summary of outcome measures and time points for collection.
Outcome measure | Baseline | 4 weeks | 6 months | 12 months |
Neck Disability Index | Yes | Yes | Yes | Yes |
Visual Analog Scale | Yes | Yes | Yes | Yes |
Global Rating of Change | No | Yes | Yes | Yes |
Patient perception of intervention | No | Yes | Yes | Yes |
Patient expectations | Yes | No | No | No |
Once the baseline examination is complete, equal numbers of patients will be randomly assigned to one of two groups: (1) manual therapy, exercise, and dry needling (MTEX-Needle group) or (2) manual therapy, exercise, and sham dry needling (MTEX-Sham group). A random-number generator will be used to conduct the randomization. The randomization procedure will be conducted prior to the initiation of the study using a computer program randomizer by an individual not involved in patient recruitment. The randomization will be concealed according to the following procedure. The group assignment will be recorded on a label that will be placed inside an envelope and the envelope will be sealed. After the baseline examination is complete, the randomization envelope will be handed to a treating therapist and treatment will begin according to group assignment. Treatment will be initiated immediately following the baseline examination, unless prohibited by time constraints; in this case, the patient will be scheduled for a follow-up session within 3-5 days to receive the first treatment. Patients in both groups will attend physical therapy for seven treatments over a maximum of 4 weeks. Each treatment session will last for a total of 45 minutes of one-on-one treatment time with the treating physical therapist.
To ensure that the clinicians involved in administering the treatment are familiar with the procedures of the study, they will be required to participate in a 2-hour training session. During the training session, the manual therapy, exercise, and dry needling techniques will be reviewed to ensure treatments are applied in a standardized manner consistent with the treatment algorithm outlined below. The majority of the training time (ie, 1 hour) will be dedicated to ensuring standardization of the application of the dry needling and sham needling techniques. The second hour will be spent reviewing the manual therapy techniques, therapeutic exercises, and algorithms to help standardize their prescription, as well as data collection procedures. Due to the pragmatic nature of this study design, even when the treatment algorithm is followed for manual therapy and exercise, there will likely be some variation in the interventions selected by each therapist based on each patient’s relevant examination findings. As this is a pragmatic trial designed to mimic usual clinical practice, this individualization of a patient’s treatment is acceptable and expected. All therapists applying all interventions will be licensed physical therapists who have also completed the required postgraduate training that enables them by their state practice act to utilize dry needling, and who regularly use the technique in practice.
Individuals randomized to both groups will receive manual therapy to address joint mobility of the cervical and thoracic spine. Mobilization of the cervical spine and thrust manipulation targeting the thoracic spine will occur at the beginning of each treatment. The treatment algorithm, combined with physical examination findings, will guide clinicians to allow them to determine which techniques will be used and is outlined below (see
The examiner will record a single range of motion measurement for flexion and extension using an inclinometer as described by Hole [
Spring testing of the cervical and thoracic spine over the spinous processes of the vertebrae will be tested with the patient prone [
Manual intervention algorithm for treatment selection.
Assessment | Treatment |
Clinicians assess cervical spine mobility and range of motion, including overpressure and repeated movements, if indicated | If hypomobility or limited range of motion is identified in the cervical spine, the therapist will utilize cervical thrust manipulation or nonthrust mobilizations; this may include central and unilateral posterior-anterior, side glides, and occipito-atlanto joint (C0-1) |
Thrust manipulations may be repeated up to two times if reassessment of the patient shows improvements in range of motion, mobility, and/or pain | |
Nonthrust mobilizations generally performed two to three times ×30 repetitions at each hypomobile level and may be repeated again (two to three times ×30 repetitions) if the patient shows improvements in range of motion, mobility, and/or pain | |
Clinicians assess thoracic spine mobility and range of motion | If hypomobility or limited range of motion is identified in the thoracic spine, the therapist will utilize thoracic thrust manipulation and/or nonthrust manipulation (may include central and unilateral posterior-anterior techniques to the thoracic spine and ribs) |
Thrust manipulation will be used unless contraindications noted (history or self-report of osteopenia/osteoporosis, etc) | |
Thrust manipulations may be repeated up to two times if reassessment of the patient shows improvements in range of motion, mobility, and/or pain | |
Nonthrust manipulations generally performed two to three times ×30 repetitions at each hypomobile level and may be repeated again (two to three times ×30 repetitions) if the patient shows improvements in range of motion, mobility, and/or pain |
Exercise intervention algorithm for treatment selection.
Assessment | Treatment | Progression |
Muscular endurance of the cervical flexors was evaluated with the deep neck flexor endurance test and evaluated based on hold time in seconds | Prepare participant in supine, hook-lying position and ensure craniocervical and cervical regions are in a neutral position (support with a folded towel if necessary). |
Begin with craniocervical flexion. |
Craniocervical and cervical extensors | Patient either prone on elbows or in four-point kneeling position. |
Patient either prone on elbows or in four-point kneeling position. |
Muscle length test: upper trapezius, latissimus dorsi, pectoralis minor, pectoralis major, levator scapulae, anterior and middle scalenes, and the suboccipital muscles; also scored as tight or normal | Stretching of muscles determined to have decreased length |
Self-overpressure to stretching of muscles will be added as appropriate |
Manual muscle tests performed for the lower trapezius, rhomboids, middle trapezius, and serratus anterior | Patient to perform exercises without exacerbation of symptoms |
Patient will be progressed to medium, heavy, and extra heavy for resistance as appropriate, based on the patient’s ability |
Individuals randomized to both groups will receive exercise designed to improve performance of both the deep neck flexor musculature as well as the scapular musculature. The physical examination will guide exercise interventions. See the exercise intervention treatment algorithm in
The patient will be instructed to maintain usual activity levels within the limits of pain. Advice to maintain usual activity has been found to assist in recovery from neck pain. Patients will be instructed to do all activities that do not increase symptoms and to avoid activities that aggravate symptoms.
Endurance of the neck flexors will be assessed with the patient lying supine in a hook-lying position. The patient will retract the chin and lift the head and neck until the head is approximately one inch above the plinth. Once in position, a line will be drawn across one of the skin folds along the patient’s neck while the therapist maintains support just under the patient’s occiput. When either the line edges begin to separate or if the patient’s head touches the therapist’s hand for more than one second, the test will be terminated. This technique has been demonstrated to have moderate reliability (ICC of .67) [
Length of the upper trapezius, latissimus dorsi, pectoralis minor, pectoralis major, levator scapulae, anterior and middle scalenes, and the suboccipital muscles will be assessed according to the descriptions provided by Cleland et al [
Strength of the upper quadrant will be tested according to the techniques described by Kendall [
Individuals randomized to the MTEX-Needle group will receive dry needling targeting the posterior musculature of the cervical and thoracic spine. Dry needling will occur after the manual therapy and exercise at each treatment session. The physical examination findings will guide clinicians to allow them to determine which specific muscles will be targeted (see
The neck and upper quarter will be examined for the presence of the following: a hypersensitive spot in a palpable taut band, palpable or visible local twitch on pincer palpation, and reproduction of referred pain elicited by palpation of the sensitive spot. These criteria have been shown to exhibit good interexaminer reliability (κ=.84-.88) when applied by an experienced clinician [
Park Sham acupuncture needles (AcuPrime) will be used to perform sham dry needling in all patients randomized to the MTEX-Sham group. These needles have been reported to be indistinguishable from real needles in a patient who has not experienced dry needling before [
Descriptive statistics, including frequency counts for categorical variables and measures of central tendency and dispersion for continuous variables, will be calculated to summarize the data. Baseline demographic data will be compared across treatment groups to assess the adequacy of the randomization.
Dry needling intervention algorithm for treatment selection.
Assessment | Treatment |
Trigger point assessment performed on the trapezius | Patient in prone, therapist identifies the hypersensitive spot in the trapezius |
The overlying skin will be cleansed with alcohol | |
Once the needle has been inserted manually into the trigger point, the needle will be pistoned in an up-and-down fashion so that 2- to 3-mm vertical motions occur (ie, fast-in and fast-out technique as described by Hong) at approximately 1 Hz for 25-30 seconds, with the aim of eliciting local twitch responses | |
After needle is removed, pressure with a cotton ball will be maintained to prevent excessive bleeding | |
The number of sites and specific muscles treated will be recorded by the therapist | |
Trigger point assessment performed on the levator scapulae | Patient in prone, therapist identifies the hypersensitive spot in the levator scapulae |
The overlying skin will be cleansed with alcohol | |
Once the needle has been inserted manually into the trigger point, the needle will be pistoned in an up-and-down fashion so that 2- to 3-mm vertical motions occur (ie, fast-in and fast-out technique as described by Hong) at approximately 1 Hz for 25-30 seconds, with the aim of eliciting local twitch responses | |
After needle is removed, pressure with a cotton ball will be maintained to prevent excessive bleeding | |
The number of sites and specific muscles treated will be recorded by the therapist | |
Trigger point assessment performed on the splenius capitis, semispinalis, spinalis capitis, and multifidi | Patient in prone, therapist identifies the hypersensitive spot in the splenius capitis, semispinalis, spinalis capitis, or multifidi |
The overlying skin will be cleansed with alcohol | |
Once the needle has been inserted manually into the trigger point, the needle will be pistoned in an up-and-down fashion so that 2- to 3-mm vertical motions occur (ie, fast-in and fast-out technique as described by Hong) at approximately 1 Hz for 25-30 seconds, with the aim of eliciting local twitch responses | |
After needle is removed, pressure with a cotton ball will be maintained to prevent excessive bleeding | |
The number of sites and specific muscles treated will be recorded by the therapist | |
Trigger point assessment performed on the suboccipital muscles | Patient in prone, therapist identifies the hypersensitive spot in the suboccipital muscles |
The overlying skin will be cleansed with alcohol | |
Once the needle has been inserted manually into the trigger point, the needle will be pistoned in an up-and-down fashion so that 2- to 3-mm vertical motions occur (ie, fast-in and fast-out technique as described by Hong) at approximately 1 Hz for 25-30 seconds, with the aim of eliciting local twitch responses | |
After needle is removed, pressure with a cotton ball will be maintained to prevent excessive bleeding | |
The number of sites and specific muscles treated will be recorded by the therapist |
We will compare baseline variables between groups by using independent
Sample size and power calculations were performed using G*Power version 2 statistical software (Heinrich-Heine- Universität Düsseldorf) based on the minimal clinical improvement of 12 points on the NDI [
The risks associated with a patient’s participation in this study are minimal. Patients may experience an increase in pain intensity from completing the range of motion exercise due to a muscle or ligament injury. Based on our clinical experience, the chance of this happening is rare, which means it occurs in less than 1% of people. We have attempted to minimize this risk by having a licensed physical therapist examine all patients and instruct them in the proper exercise technique. In addition, a therapist will re-examine a patient at any time, if appropriate. It is also possible that patients will experience mild muscle soreness after the manipulation is performed. Based on our clinical experience, the chance of this happening is common, which means it occurs in 1%-25% of people. However, this soreness typically resolves within 1-48 hours after manipulation. We have minimized the risks associated with manipulation by ensuring that the licensed physical therapists participating in this study already routinely use manipulation in the management of patients with neck pain. We have further minimized this risk by ensuring that each physical therapist participating in this study has been specifically trained in the use of the manipulation techniques to be used in this study. Furthermore, all potential subjects will be screened to ensure they do not exhibit any exclusion criteria that may place the individual at increased risk for a serious complication.
When dry needling treatment is performed, it is possible that patients will experience the following common adverse events: bruising, bleeding, pain during treatment, pain after treatment, or aggravation of symptoms 1.7%-7.6% of the time (~2-8 out of 100). Uncommon adverse events include the following: drowsiness, headache, or nausea 0.13%-0.26% of the time (~1-3 out of 1000). Possible rare adverse events include fatigue, altered emotions, shaking, itching, claustrophobia, or numbness 0.01%-0.04% of the time (1-4 out of 10,000). Dry needling is very safe; however, the most serious side effect from dry needling is pneumothorax (ie, lung collapse due to air inside the chest wall), which can occur in less than 0.01% (<1 out of 10,000) treatments. This risk is very low and in a recent survey of physical therapists who use dry needling, Brady et al reported that no episodes of pneumothorax occurred in over 7600 treatments. We have minimized the risks associated with dry needling by ensuring that the licensed physical therapists participating in this study already routinely use dry needling in the management of patients with neck pain. We have further minimized this risk by ensuring that each physical therapist participating in this study has been specifically trained in the use of the dry needling techniques to be used in this study. Furthermore, all potential subjects will be screened to ensure they do not exhibit any exclusion criteria that may place the individual at increased risk for a serious complication.
Should any adverse event occur, it would be appropriately managed by the treating physical therapist by activating emergency services if immediate medical attention is required; standard clinical advice will be used in the case of minor events, such as transient soreness.
This trial is registered at ClinicalTrials.gov (NCT02731014) and recruitment is currently underway and is expected to be completed by the end of 2017. Data collection for long-term outcomes will occur throughout 2017 and 2018. Data analysis, preparation, and publication submission is expected to occur throughout the final three quarters of 2018. See
Timeline and milestones.
Activity | 2016 (quarter) | 2017 (quarter) | 2018 (quarter) | |||||||
3 | 4 | 1 | 2 | 3 | 4 | 1 | 2 | 3 | 4 | |
Participant recruitment | X | X | X | X | X | X | ||||
Data collection for long-term outcomes | X | X | X | X | X | X | X | X | ||
Data analysis, preparation, and submission for publication | X | X | X | |||||||
Publication submissions | X |
Neck pain is commonly unresponsive or does not fully resolve with current treatment strategies, with 37% of patients going on to experience chronic neck pain of greater than one year [
Therefore, the aim of this trial is to determine if the addition of dry needling to an exercise and manual therapy treatment program will further reduce pain and improve disability in patients with mechanical neck pain, as compared to exercise and manual therapy and sham needling.
We hypothesize that patients who receive dry needling, manual therapy, and exercise will achieve greater reductions in pain and disability in the short term (ie, 4 weeks) and long term (ie, 6 and 12 months) compared to those who receive sham dry needling, manual therapy, and exercise.
As the use of dry needling by physical therapists becomes more widespread, and more therapists are trained in this approach, research is needed to support or refute its effectiveness. The results of this trial will assist in providing long-term outcomes examining the effectiveness of dry needling, which are currently lacking in the literature.
We anticipate the potential challenges to this study to include the following: difficulty with patient recruitment, patient compliance with follow-up schedule, and patients lost to follow-up over the 1-year, long-term, follow-up period. To address these challenges, we have utilized two large clinics in different locations in the United States to improve the ability to recruit patients in a timely manner. Further, we will provide a small financial reimbursement for patients as incentive for completion of the 4-week, 6-month, and 12-month follow-up in order to assist with compliance and reduce the numbers lost to follow-up.
We recognize that there are a number of potential limitations in the study design. The treating therapists cannot be blinded to group assignment, which may influence the verbal and nonverbal interaction with subjects. To try to manage this limitation, all therapists will be trained to maximize the consistency with which the dry needling intervention and the sham intervention will be performed.
We have chosen to allow therapists to perform individualized dry needling treatment specific to each patient within the outlined treatment algorithm to be consistent with clinical practice and improve external generalizability. We believe that providing treatment specific to the patient’s presentation will improve outcomes. We understand this may be seen as a limitation as it may lead to variation in the treatments that will be applied by therapists, which may mask the difference between groups. However, individualized treatment better reflects clinical practice.
Another potential limitation is that we are not including physical measures such as range of motion or pain pressure threshold in our analyses. We have chosen to limit our outcomes to validated questionnaires in an effort to decrease loss to follow-up, especially at the long-term time points.
APTA Grant review peer review report.
CONSORT‐EHEALTH checklist (V.1.6.1).
Global Rating of Change Scale
inter-class correlation
manual therapy, exercise, and dry needling
manual therapy, exercise, and sham dry needling
myofascial trigger point
Neck Disability Index
Visual Analog Scale
The authors would like to thank the Orthopaedic Section of the American Physical Therapy Association for providing funding for this trial.
None declared.