- Study protocol
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Taping patients with clinical signs of subacromial impingement syndrome: the design of a randomized controlled trial
BMC Musculoskeletal Disorders volume 12, Article number: 188 (2011)
Shoulder problems are a common complaint of the musculoskeletal system. Physical therapists treat these patients with different modalities such as exercise, massage, and shoulder taping. Although different techniques have been described, the effectiveness of taping has not yet been established. The aim of this study is to assess the effectiveness and cost-effectiveness of usual physical therapy care in combination with a particular tape technique for subacromial impingement syndrome of the shoulder compared to usual physical therapy care without this tape technique in a primary healthcare setting.
Methods and design
An economic evaluation alongside a randomized controlled trial will be conducted. A sample of 140 patients between 18 and 65 years of age with a diagnosis of subacromial impingement syndrome (SAIS) as assessed by physical therapists will be recruited. Eligible patients will be randomized to either the intervention group (usual care in combination with the particular tape technique) or the control group (usual care without this tape technique). In both groups, usual care will consist of individualized physical therapy care. The primary outcomes will be shoulder-specific function (the Simple Shoulder Test) and pain severity (11-point numerical rating scale). The economic evaluation will be performed using a societal perspective. All relevant costs will be registered using cost diaries. Utilities (Quality Adjusted Life Years) will be measured using the EuroQol. The data will be collected at baseline, and 4, 12, and 26 weeks follow-up.
This pragmatic study will provide information about the effectiveness and cost-effectiveness of taping in patients presenting with clinical signs of SAIS.
Trial registration number: NTR2575
Shoulder problems are a common complaint of the musculoskeletal system. It is the second most common musculoskeletal disorder following low back pain  and results in high morbidity . Of all shoulder problems, subacromial impingement syndrome (SAIS) is the most frequent diagnosis , accounting for 44-65% of all shoulder problems [4–6]. In general, SAIS (also known as external impingement) is defined as the entrapment of the rotator cuff and subacromial bursa between the humerus and the coracoacromial arch .
Patients with SAIS are commonly treated by a physical therapist (PT). Various therapeutic options have been described, however, most are lacking a rigorous scientific background and there is uncertainty about the associated costs . Some reviews have reported that exercise and manual treatment are most effective in relieving pain and improving function in SAIS, but the evidence for effectiveness is still under debate [8, 9].
A promising modality in physical therapy is the application of taping. The essential function of the tape is to provide support during movement. However, research indicates that the tape also plays a role in decreasing the upper trapezius muscle activity  and offers a constant input on the proprioceptive system of the upper body muscles which support the active movement .
Three studies have examined the clinical effects of taping patients with SAIS using leukotape in combination with fixomull stretch (BSN medical®) [12–14]. In a pilot study of 22 patients with unilateral shoulder pain of more than six weeks, Miller et al.  compared taping as an adjunct to usual physical therapy with usual physical therapy alone. They found a strong trend toward reduced pain and improved function in favor of scapular taping at two weeks. The magnitude of these differences was reduced at a follow-up at six weeks. Case studies of taping patients with SAIS have been published by Host et al.  and Shamus and Shamus . Both studies found a reduction in pain and an improvement of function. In sum, the effects in pain relief and improving shoulder function due to shoulder taping looks promising. However, study samples were small or had no control group. In addition, tape techniques vary and we must conclude that the evidence for its usefulness is still limited. Therefore, the primary aim of this study is to assess the effectiveness and cost-effectiveness of usual physical therapy care in combination with one particular tape technique for subacromial impingement syndrome of the shoulder compared to usual physical therapy care alone in a primary health care setting.
An economic evaluation will be conducted alongside a randomized controlled trial (RCT). Figure 1 provides an overview of the study design. Outcomes will be measured at baseline, 4, 12 and 26 weeks follow-up.
A sample of 140 patients between 18 and 65 years of age with clinical signs of SAIS will be recruited from the primary physical therapy setting in the Netherlands between September 2010 and November 2011.
The Medical Ethics Committee of the VU University Medical Centre in Amsterdam has approved the study protocol (registration number: 2010\119).
To be eligible for the trial, patients must meet the following criteria as assessed by the participating PTs; Two positive impingement tests indicating SAIS (see section impingement tests), age between 18 and 65 years, and accepting the consequences of participation in the study. Patients will be excluded if they have a primary SAIS (anatomical abnormalities as scapulohumeral joint dysplasia, total cuff tear etc. confirmed with radiography and/or diagnostic ultrasound with exception of calcifications, minor arthrosis, and partial cuff tears]), been operated previously at the shoulder or cervical spine, a rheumatic disease such as polymyalgia rheumatica, rheumatoid arthritis, lupus erythematosis and fibromyalgia, a severe arthritis of the glenohumeral joint, had three or more subacromial corticosteroid injections in the last year, a (suspected) severe disease such as malignancy, had severe trauma of the shoulder in the last 6 months, a neurologic disease with negative consequences for the shoulder (such as cerebral vascular accident, multiple sclerosis, Parkinson's disease), type II diabetes, had a luxation or fracture of the affected shoulder, a cervico-radicular syndrome, a pathology of organs with negative consequences for the shoulder, dementia, a psychiatric disease, an insufficient understanding of the Dutch language, a bad condition of the skin around the shoulder because of a skin disease, and an allergy to tape.
Recruitment of patients
At the first consult, PTs will inform all eligible patients who attend their primary care clinic about the study and will assess patients for the in- and exclusion criteria. Patients will be further instructed about the study through a patient information letter. For patients interested in participating, the PT will provide contact details of the patients to the investigators. One of the investigators will phone the patient before the second consult to answer potential questions and to provide information. If the patient decides to participate, they will be asked to fill in baseline questionnaires (digital or paper) before the second physical therapy consult. At the second consult, the patient will sign an informed consent form. Thereafter, the PT will open a numbered opaque sealed envelope containing the treatment allocation (i.e. usual physical therapy care in combination with one particular tape technique or usual physical therapy care without this tape technique).
Prior to the study, every practice will receive 10 to 20 concealed envelopes, which contain an allocation to one of the two treatment strategies. The randomization process will be generated by computer. To prevent unequal treatment-group sizes, the patients will be randomized according to a stratified block randomization method, in blocks of four. The PTs will not know the sequence of the treatment allocation codes of each practice to guarantee allocation concealment.
Many different diagnostic criteria for the SAIS have been suggested . In general, clinicians base the diagnosis of SAIS on the history of the patient and specific signs and symptoms. Research findings suggest that single tests have limited use in informing diagnosis and a combination of tests improves clinical utility [9, 15]. For the present study, two or more positive well-known SAIS tests will indicate a SAIS, which is in concordance with previous pragmatic studies . The following SAIS tests will be used: the painful arc of abduction test , the empty can test (Jobe test) , the external rotation resistance test  and the Hawkins-Kennedy test . The reliability of all tests is acceptable for clinical use .
All patients will be treated by PTs of the participating clinics. Prior to the study, all PTs will follow a 1½-hour training session in which the rationale of the study will be described and discussed, and the taping method will be instructed and trained. The PTs will receive a detailed manual of the study protocol including a standardized eligibility checklist, and a description of the impingement tests and the taping technique.
Patients who are allocated to usual physical therapy in combination with tape will be treated at the end of each treatment session for at least 4 weeks by a modified tape technique after Shamus and Shamus . In this technique, the arm of the patient lays on the treatment table, with the shoulder in 80° abduction in the plane of the scapula (Figure 2). Two strips of rigid tape (leukotape, BSN medical®) will be placed upon two strips of elastic tape (fixomull stretch, BSN medical®) without tension. When the arm of the patient is brought back to a relaxed position along the body, the arm will be slightly abducted from the body (approximately 10°) due to the tension of the tape (Figure 3). The tape will be worn for a minimum of 2 and a maximum of 7 days. Tape will be worn for short periods (2-3 days) for patients with severe pain and at the beginning of the tape period, and longer for patients with less pain and who are familiar with wearing the tape. In addition, patients with severe pain will be taped with the shoulder in less abduction (50-70°) so that the tape produces less tension when the arm is in the relaxed position. At least one to two days before the next treatment, the tape will be removed by the patient in order to let the skin recover from the tape. The PT is free to determine the abduction angle of the shoulder in which the shoulder will be taped, the exact days the tape will be worn and the number of treatments per week in order to reflect clinical practice. During the first 4 weeks, the treatment with tape will be stopped if the patient is free of pain, allergic to tape or reports a substantial increase in complaints because of the tape.
Usual care will consist of individualized tailored physical therapy. The content of treatment, i.e. the choice of interventions, is at the discretion of the PT. In general, therapy is expected to include exercises to improve mobility and muscle function, passive mobilizations, instructions (posture and movement), massages and ice packages . Furthermore, if the patient is not allocated to usual care in combination with shoulder taping, the use of kinesiotape will be allowed. In the Netherlands, kinesiotape is frequently used, but the theoretical concept, the tape structure, and the techniques are not comparable to the tape and tape technique used in this study [21, 22]. During the first four weeks the patients are requested not to receive any co-interventions (such as complementary and/or alternative medicine [CAM], injection therapy or surgery). The use of (pain) medication is allowed in both groups.
For both interventions the number of treatment sessions, the treatment modalities, the treatment goals, any deviations from the protocol, and reasons for prematurely terminating treatment (e.g. skin problems due to the tape) will be recorded. In addition, PTs in both groups familiar with the classification system described in Cools and Walravens  will classify the patients according to this system, in order to identify subgroups that respond best to the tape technique used. The principal investigators will regularly monitor the PTs for compliance with the treatment protocols, by means of phone calls and e-mail contact.
At baseline, patients will be asked to fill in digital or paper questionnaires before the start of the treatment, and after 4 and 26 weeks follow-up. After 12 weeks, patients will be called by the investigators to collect data about global perceived recovery, pain severity, and costs (Table 1).
The baseline questionnaire will include questions about socio-demographic characteristics (e.g. age, gender, and marital status), pain severity, shoulder-specific function, primary functional problem, health related quality of life and general health. General health will be evaluated with the Short-Form 36 (SF-36) . This questionnaire consists of 36 questions that can be aggregated to form eight subscales (physical functioning, mental health, general health perceptions, pain, role limitations physical, role limitations emotional, social functioning, and vitality) and two sum scales (physical and mental component scales). The scores on all subscales range from 0-100, with higher scores indicating better outcomes. It is a widely used measurement instrument with satisfactory validity, reproducibility and responsiveness to change . The Dutch translation has been found to be sufficiently valid .
The primary outcome measures will be:
The Simple Shoulder Test (SST)  measuring shoulder function. The SST will measure gains and losses of function over time through a series of 12 questions with dichotomous "yes" or "no" response options. More scores on yes relates to less pain and less disability of the shoulder. The SST has been found to be sufficiently valid, reliable and responsive [28, 29].
Secondary outcome measures include:
Global perceived recovery, measured by self-assessment on a 7-point Likert scale ranging from "completely recovered to "worse than ever" . This will be dichotomized into success (complete and much recovered) and non-success (slightly recovered, no change, slightly worse, much worse, and worse than ever).
Perceived recovery from a primary functional problem, measured by an 11-point NRS. Prior to the treatment programme, the patients will select one functional activity that often occurs and cannot be avoided. The patient will be asked to describe the activity as specific as possible and wherever possible to quantify the activity in terms of time, distance, weight lifted, and so on. Beurskens et al. investigated the value of this instrument in patients with low back pain, but used a more complex procedure compared to our pragmatic approach . They concluded that the responsiveness is good and changes in function problems were displayed properly.
The treating PTs and patients cannot be blinded for the treatment allocation because of the knowledge of receiving the modality. The investigators, who will conduct the data collection and data entry, will not be blinded. However, almost all outcome measures will be collected using questionnaires without personal contact with the patient. The participating statistician will perform the analyses blinded for treatment allocation.
Power calculations, based on the studies carried out by Santamato et al.  and Tashjian et al.  were performed for the 2 main outcomes (power 0.95; alpha 0.05). To detect a clinically relevant mean difference between the two treatment groups of 2 points on the SST  (standard deviation [SD] 2), 26 patients are needed per group. To detect a clinically relevant mean difference of 2 points (SD 3) for pain (11-point NRS) , 2 groups of 59 patients are needed. Anticipating a potential drop-out of 15%, 70 participants per treatment group (total n = 140) will be recruited.
Baseline characteristics of the two treatment groups will be compared regarding the main prognostic characteristics. The primary analysis will be on an intention-to-treat basis. The data will be analyzed in a linear mixed model with measurements at baseline, 4, 12 and 26 weeks. In this model, the effect of the interaction is time by treatment interaction. The included levels will be; repeated measures (i.e. time), patient, PT, and PT practice. The treatment effects between baseline measurement and follow-up will be calculated between the two treatment groups with a 95% confidence interval. If prognostic factors are unevenly distributed, multivariate analysis will be used to correct for the differences between the groups.
The influence of deviations on the treatment protocol will be evaluated using a per protocol analysis. A deviation of the protocol is defined as not receiving treatment after allocation, withdrawal from therapy after one to three visits and not being treated according to patient's treatment allocation.
Economic evaluation from a societal perspective
The economic evaluation will be conducted from a societal perspective. Both a cost-effectiveness and cost-utility analysis will be performed. Shoulder function (SST) and pain severity (NRS) will be primary outcomes in the cost-effectiveness analysis. Health-related quality of life will be measured with the EuroQol (EQ-5D) . This questionnaire assesses 5 dimensions (mobility, self-care, usual activities, pain/discomfort and anxiety/depression) on a 3-point scale; no problems, moderate problems and severe problems. The questionnaire is appropriate for estimating quality-adjusted life-years (QALYs), and can be used for cost-utility analysis. The total score is expressed in utilities according to the Dolan model . QALYs will be calculated by multiplying the utility of a health state by the time spent in this health state, based on the Dutch valuation tariff .
Direct and indirect costs will be measured by means of self-completed cost diaries . The following costs will be evaluated: I) health care costs (e.g. primary care, medical specialist care, prescription of medication, and hospitalization); II) patient costs (out-of-pocket expenses, such as over-the-counter medication and CAM); and III) costs of loss of productivity (work absenteeism).
Costs will be valued according to the guidelines published in the updated handbook for economic evaluation in the Netherlands . For paid labour, the costs will be calculated, using both the human capital approach and the friction cost approach. The incremental costs from the intervention group over the usual care group will be compared to incremental outcomes. The incremental cost-effectiveness ratios (ICER) will be calculated with the mean differences in costs and effects. To calculate the mean differences in costs and to analyse the uncertainty around the ICERs, the bias-corrected percentile bootstrapping method (5,000 replications) will be used. The uncertainties around the ICERs will be presented in a cost-effectiveness plane. Finally, the probability that usual care with the particular tape technique is cost-effective in comparison to usual care for various thresholds decision makers are willing to pay to gain one extra unit of effect will be presented on a cost-effectiveness acceptability curve.
Few studies have been performed evaluating the clinical effects of taping shoulders in patients presenting clinical signs and symptoms of SAIS, although some promising results have been reported [12–14]. It is interesting to note that there have been some studies for other patient populations using leukotape in combination with fixomull stretch. Peterson  described a taping technique with electrical stimulation in one patient with central cord syndrome and bilateral shoulder subluxation and concluded that the shoulder taping along with electrical stimulation and a rehabilitation program may have played a role in the reduction of the patient's shoulder subluxation. In a RCT, the effect of shoulder taping in 98 patients with a stroke was studied . They found a non significant trend for less pain and better function in strapped patients after 6 weeks. Finally, a number of authors have investigated the effect of shoulder taping on electro-activity of shoulder muscles, but their findings are contradictory [10, 11, 44, 45].
In sum, the use of shoulder taping is a promising modality in improving outcomes on pain relief and function improvement in those presenting to primary physical therapy care with signs and symptoms of SAIS, however the method has not been adequately tested.
To our knowledge this is the first RCT examining the possible additional effect of taping using a modified technique according to Shamus and Shamus  compared to usual physical therapy alone in primary care patients presenting with signs and symptoms of SAIS. In addition, it includes the first economic evaluation on taping for SAIS.
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The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-2474/12/188/prepub
Leukotape P combi packs (patella taping kits) will be provided by BSN medical®. The funder will have no role in the design, conduct, analysis or writing of the report.
All authors participated in the design of the study. JK drafted the manuscript with input from the other authors. All authors read, revised and approved the final manuscript.
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Kalter, J., Apeldoorn, A.T., Ostelo, R.W. et al. Taping patients with clinical signs of subacromial impingement syndrome: the design of a randomized controlled trial. BMC Musculoskelet Disord 12, 188 (2011). https://doi.org/10.1186/1471-2474-12-188
- Usual Care
- Numerical Rating Scale
- Physical Therapist
- Polymyalgia Rheumatica
- Subacromial Impingement Syndrome