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Well-described exercises for chronic low back pain in Life Science Literature: A systematic review

Abstract

BACKGROUND:

Therapeutic exercise (TE) is recommended in multimodal treatment for patients with non-specific chronic back pain (cLBP).

OBJECTIVE:

The aim of this study is to identify an exercise or a spectrum of exercises, well described and reproducible by the clinician, for cLBP patients.

METHODS:

Systematic review by researching in the databases MEDLINE, EMBASE, PEDro, CINAHL, and Scopus. Evidence from Randomized Controlled Trials (RCTs) supported the TE in patients with non-specific cLBP, provided that it was well described and could be repeated by another therapist. Methodological evaluation was performed using the PEDro scale and only studies with a score of 6 were included. The assessment of the intervention description was carried out with the TIDieR checklist. The risk of bias was examined.

RESULTS:

Twenty-one articles were included in this systematic review. The defective description and the poorly reporting of the intervention makes it more difficult for the clinician to include the TE into clinical practice.

CONCLUSIONS:

The findings of this study showed that the reporting of the intervention in high quality RCT on chronic low back pain is low, threatening the external validity of the results.

1.Introduction

Worldwide, low back pain (LBP) is the prime cause of disability [1, 2]; more than 80% of people have at least one episode of back pain in their life time [3]. LBP is the most common reason for medical consultation [4] among musculoskeletal disorders [3]; on the basis of these reports, LBP is associated with the high costs to companies, including those related to health care and indirect care, in terms of absence from work or reduced productivity [1]. The LBP is also classified according to the duration of the symptoms: acute ( 4 weeks), sub-acute (between 4 and -12 weeks) and chronic ( 12 weeks) [4]. Among the most common non-pharmacological treatments [4] for cLBP, therapeutic exercise is widely recommended [5, 6, 7]. Several studies showed that in the treatment of LBP, no particular exercise is more effective than another [8] hence, Life Science Literature recommends exercise programs modifiable and tailored to the needs and preferences of the patient, provided that the physical exercise is supervised [3, 6].

To convert evidence of effective treatment into practice and to replicate the action recommended and described in a research, clinicians need to have precise information about the details of the interventions of the exercise including dose, frequency, and intensity. This requires clear, complete, and accessible reports of all elements of the exercise, as assessed in the research studies.

Given the importance of adequate reporting of physical activity interventions in clinical trials, it is necessary to consider the Template for Intervention Description and Replication (TIDieR) in order to improve the generalizability of the results. It was developed by an international group of experts and stakeholders [9] to guide the complete reporting on physical activity interventions. The TIDieR checklist contains the minimum information about the physical activity interventions, as reported by the authors, with sufficient details that allow their replication. In addition, the TIDieR checklist has been widely adopted by scientific journals to improve the reporting of physical activity interventions [10].

Yamato et al. reported that, for most physiotherapy trials, physical activity interventions are incompletely recorded and therefore, not reproducible [11]. Poorly reported interventions can create barriers to implementation of best clinical practices that may affect treatment effectiveness, not allowing patients to receive up-to-date evidence-based interventions [12].

Aspects of completeness and quality in reporting the physical activity interventions in the treatment for cLBP have not been evaluated in Life Science Literature. The present article aims to identify an exercise or a spectrum of exercises for cLBP patients, appropriately described and reproducible by the clinician, based on assessment, needs and preferences of the patient, that can be used in response to the physical, emotional, social and economic problems caused by LBP pain [2].

2.Objectives

To verify if Life Science Literature contains studies describing exercise programs for patients with cLBP that are reproducible by a physiotherapist, we performed a systematic review of RCTs, that evaluate the effectiveness of exercise therapy, as compared to non-treatment or other treatments in reducing the main outcomes, such as pain, disability, functions and quality of life, using the TIDieR checklist as an essential tool to evaluate the quality of interventions reported in RCTs.

3.Methods

The methodology and the reporting of this systematic review were based on the Preferred Reporting Items for Systematic Reviews and Meta-Analysis Statement [13]. The protocol was a-priori registered on PROSPERO, an international prospective register of systematic reviews (registration number: CRD42018117317).

3.1Eligibility criteria

RCTs, assessing TE in adult patients aged 18 years and over with non-specific cLBP were included as the Population of the study. Moreover about the Intervention, studies assessing every type of TE (i.e., aerobic, endurance, stretching, motor control, core stability, strengthening, flexibility) performed individually or in groups, supervised or not, alone or within a multimodal treatment that was reproducible by another operator, were considered. To satisfy the criterion of reproducibility of the exercise, the RCT had to provide clear instructions, within the article itself, without referring to other protocols of articles, for example about execution, movement, timing and repetitions of the exercise in order to make it replicable by another operator within his working setting, without the use of a particular mechanical aid or tool. The control is represented by no treatments, usual care, manual therapy, multimodal treatment and other type of exercise or physiotherapy interventios; detailed information is given in Table 1.

Studies including pregnant patients or patients with acute or subacute or specific LBP or assessing pharmacological, surgical or physical therapies (i.e., laser therapy, ultrasound, etc.) or Pilates and Yoga treatments were excluded. Only studies with PEDro score 6 were included. The main outcome considered were pain and disability.

3.2Data sources and searches

The studies were identified through bibliographic research on the MEDLINE (through the interface PubMed), Excepta Medica dataBASE (EMBASE), the Physiotherapy Evidence Database (PEDro), the Cumulative Index to Nursing and Allied Health Literature (CINAHL) and Scopus databases from their inception

Table 1

Characteristics of the studies

ReferencesCharacteristics of the experimental sampleCharacteristics of the control sampleIntervention of the experimental groupIntervention of the control groupOutcome measuresOutcome resultsFollow-upPedro score
Aasa et al., 2015N:35 Female: 54% Age: 42.0 ± 11.0N:35 Female: 57% Age: 42.0 ± 10.0Low load motor control exercises (LMC)High load lifting exercises (HLL)Pain: PSFS, VAS Function: Strenght, endurance and motor control testsBoth interventions resulted in significant improvements in pain, strength, and endurance. The LMC group showed greater improvement on the PSFS compared with the HLL group (P< 0.001). The LMC group showed an increase on the movement control test subscale, whereas the HLL group showed no change (P< 0.001)2 and 12 months7/10
Bello et al., 2015N: 40 Female: 62.1% Age: 45.0 ± 12.2N: 40 Female: 39.8% Age: 43.1 ± 13.2Convention execise therapy (CET)Behavioural graded activity (BGA)Pain: NPRS Quality of life: SF-36The results indicate that CET and BGA have no significant differences (p> 0.005) on pain and quality of life12 weeks6/10
Balthazars et al., 2012N: 20 Female: 30% Age: 44.0 ± 12.0N: 22 Female: 36% Age: 42.0 ± 12.0Manual therapy and active exercise (MT+AE)Sham therapyPain: VAS Disability: ODI Fear: FABQ Endurance testsMT + AE induced lower disability (p= 0.001) and a trend to lower pain8 weeks, 3 and 6 months6/10
Bello et al., 2018N: 25 Female: NR Age: 42.2 ± 2.9N: 25 Female: NR Age: 46.6 ± 11.6Lumbar stabilization exercisesTreadmill walkingPain: VAS Disability: ODILumbar stabilisation exercises are more effective than treadmill walking exercises in activating the multifidus muscle, reducing pain intensity and functional disability (p< 0.005)8 weeks8/10
Chen et al., 2014N: 64 Female: 100% Age: 30.6 ± 4.45N: 63 Female: 100% Age: 30.6 ± 4.45Stretching exercise program (SEP)Usual activityPain: VAS Self-efficacy: The exercise Self-efficacy scaleSEP had significantly lower VAS scores (p= 0.002) and higher exercise self-efficacy (p= 0.003) at 6 months2, 4 and 6 months7/10
Costantino et al., 2014N: 28 Female: 48.2% Age: 73.6 ± 3.3N: 28 Female: 40.7% Age: 73.3 ± 3.5Back school exercisesHydrotherapy exercisesDisability: RMDQ Quality of life: SF-36In both groups we observed a highly significant statistical difference in the values (p< 0.001) but no significant statistical differences were found between the two group12 and 26 weeks6/10
Franca et al., 2012N: 15 Female: not reported Age:42.0 ± 8.1N: 15 Female: not reported Age: 41.5 ± 4.4Segmental stabilization (SS)StretchingPain: VAS, McGill pain questionnaire Disability: ODI Function: Contraction of TrABoth treatments were effective in relieving pain and improving disability (P< 0.001). Those in the SS group had significantly higher gains for all variables6 weeks8/10

Table 1, continued

ReferencesCharacteristics of the experimental sampleCharacteristics of the control sampleIntervention of the experimental groupIntervention of the control groupOutcome measuresOutcome resultsFollow-upPedro score
Garcia et al., 2013N: 74 Female: 68.9% Age: 54.1 ± 1.5N: 74 Female: 68.9% Age: 53.7 ± 1.5McKenzie exercisesBack school exercisesPain: NPRS Disability: RMDQ Quality of life: WHOQOL-BREFMcKenzie group had greater improvements in disability at 1 month (p= 0.001). No between-group differences were observed for all secondary outcome measures1,3 and 6 months8/10
Gatti et al., 2011N: 34 Female: 67.6% Age: 58.6 ± 13.0N: 45 Female: 62.2% Age: 57.1 ± 12.4Trunk balance exercisesFlexibility and strengthening exercisesPain: VAS Disability: RMQ Quality of life: SF-12The improvement in RMQ score was significantly greater for the experimental group (P= 0.011) and also in SF-12 (P= 0.048)6 weeks7/10
Jaromi et al., 2017N: 67 Female: 92,.5% Age: 41.7 ± 3.5N: 70 Female: 94.2% Age: 41.3 ± 3.8Back school programWritten lifestyle guidancePain: VAS Function: ROM, Lifting TechniqueWe found significant difference between the intervention and control group’s VAS score (p< 0.001)3 months6/10
Kim et al., 2016N: 38 Female: 60.5% Age: 39.5 ± 13.7N: 39 Female: 53.8% Age: 46.2 ± 16.3Sling exercise with elasticTrunk muscle stabilizing exercisePain: NPRS Disability: ODIA sling exercise with elastic bands leads to a reduction in pain and disability when compared to a traditional stabilizing exercise (p< 0.005)12 weeks, 3 months8/10
Michaelson et al., 2016N: 35 Female: 57.1% Age: 41.9 ± 9.9N: 35 Female: 54.2% Age: 42.2 ± 10.4High load liftingLow load motor controlPain: VAS Disability: RMDQ Quality of life: SF-36No difference was observed between the high low load lifting and low load motor control interventions2, 12 and 24 months8/10
Monteiro et al., 2015N: 14 Female: 100% Age: 68.0 ± 4.0N: 16 Female: 100% Age: 68.0 ± 4.0Control exercisesVirtual physical training with Wii + control exercisesPain: NPRS Balance: Wii Balance Board Functional Autonomy: Sit-to-stand Mood: POMSExercises with Wii were more effective only for sitting capacity p= 0.0048 weeks6/10
Nagrale et al., 2012N: 30 Female: 70% Age: 38.2 ± 3.4N: 30 Female: 60% Age:37.7 ± 4.7Slump stretchingMobilization with exercisePain: NPRS Disability: ODI Fear: FABQThe use of slump stretching shows a significantly greater improvement in ODI at 3 and 6 weeks (P< 0.01), in NPRS and in FABQ had at 1, 2, 3, and 6 weeks (P< 0.01)1, 2, 3 and 6 weeks8/10
Noormoh ammadpour et al., 2018N: 10 Female: 100% Age: 43.3 ± 7.5N: 10 Female: 100% Age: 41.3 ± 6.4Core stability exerciseWaiting listDisability: RMDQ Quality of life: SF-36 Pain: VAS Diameter of lateral abdominal musclesThe results showed significant improvements in disability, quality of life and pain in the intervention group (p< 0.005). The ultrasound data showed a significant increase in the left and right muscle diameter (p< 0.05)8 weeks7/10

Table 1, continued

ReferencesCharacteristics of the experimental sampleCharacteristics of the control sampleIntervention of the experimental groupIntervention of the control groupOutcome measuresOutcome resultsFollow-upPedro score
Oliveira et al., 2017N: 33 Female: 75.7% Age: 46.6 ± 9.5N: 33 Female: 72.7% Age: 47.2 ± 10.5Exercise (stretching, strengthening, motor control)Graded activity (aerobic training, strengthening)Pain: NPRS, McGill Pain Questionnaire Disability: RMDQ Quality of life: SF-36 Kinesiophobia: TSK Daily physical activity: Baecke Questionaire of Habitual Physical ActivityNo significant differences between groups after three and six month-follow ups were observed6 weeks, 3 and 6 months7/10
Pardo et al., 2017N:28 Female:78.5% Age:49.2 ± 10.5N: 28 Female: 78.5 % Age: 44.9 ± 9.6Pain neurophysiology education + therapeutic exerciseTherapeutic exercisePain: NPRS, PCS, Pressure pain thresholds Disability: RMDQ Kinesiophobia: TSK Change: PGIC Function: finger to floor distanceAt 3-month follow-up, a large change in pain intensity (P< 0.001) was observed for the PNE plus TE group, and a moderate effect size was observed for the secondary outcome measures1 and 3 months6/10
Rabin et al., 2014N: 48 Female: 52.1% Age: 38.3 ± 10.5N: 57 Female: 54.4% Age: 35.5 ± 9.1Lumbar stabilization exercisesManual therapyPain: NPRS Disability: MODIThe experimental intervention was more effective than the control intervention but not statistically significant.8 weeks6/10
Segal-Snir et al., 2016N: 20 Female: 100% Age: 57.1 ± 8.4N: 15 Female: 100% Age: 54.6 ± 6.4Rotation Exercises in groupOnly ADL guidancePain: VAS Function: ROM lumbar Disability: RMDQThere were no significant differences for either group (p> 0.05) on all dependent variables at all times of measurements4 and 8 weeks6/10
Vergas et al., 2011N: 24 Female: 58% Age: 37.6 ± 13.2N: 25 Female: 54% Age: 39.8 ± 11.2Multimodal physical therapy programMultimodal physical therapy Program + deep water runningPain: VAS Disability: RMQ Quality of life: SF-12 Function: Strenght, mobility and endurance testsNo significant differences between groups; the outcomes measures improved in both groups15 weeks6/10
Zafereo et al., 2018N: 20 Female: 75% Age: 46.7 ± 14.1N: 20 Female: 50% Age: 38.2 ± 13.1Regional manual therapy + standard physical therapyStandard physical Therapy: motor control exercise program and lumbar spine manual therapyDisability: ODI Pain: NPRS Fear: FABQ Pain catastrophizing PCS Effect of treatment: GROCBoth groups demonstrated improvements in disability level, pain intensity, pain catastrophizing, and fear avoidance beliefs across time (P< 0.001). There was no difference between groups for any variable over 12 weeks2,4 and 12 weeks7/10

Abbreviations: ADL = Activity of Daily Living; FABQ = Fear Avoidance Belief Questionnaire; GROC = Global Rating of Change; N/R = not reported; MODI = Modified Oswestry Disability Index; NPRS = Numeric Pain Rating Scale; ODI = Oswestry Disability Questionnaire; PCS = Pain Catastrophizing Scale; PGIC = Patient Global Impression of Change; POMS = Profile of Mood States; PSFS = Patient Specific Functional Sale; RMDQ = Roland Morris Disability Questionnaire; ROM = Range of Motion; SF-12 = 12 Item Short Form Health Survey; SF-36 = 36 Item Short Form Health Survey; TSK = Tampa Scale of Kinesiophobia; VAS = Visual Analog Scale; WHOQOL-BREF = World Health organization Quality of Life-BREF; TrA: Transverse abdominis Note: Age is reported as mean (standard deviation).

tion to the 16th of May 2020. The search string contained key terms regarding cLBP and exercise, for example “Low Back Pain” or “Exercise Therapy”. The full search strings used for each of the databases are reported in the Appendix. No time or language limits were applied to the searches.

3.3Study selection

The research of the studies in the databases was carried out individually by two evaluators. After deleting the duplicates, the studies were evaluated first by their title, then by reading the abstract, and finally by assessing full texts; in case of disagreement between the two assessors, a third evaluator made the decision.

3.4Methodological quality

The methodological evaluation of the included RCTs was performed with the PEDro scale [14], extracting the total score on the PEDro website [www.pedro.org.au]. In case the score was not reported in the website, two assessors (EP and FS) individually attributed the score: in case of disagreement, a third assessor (FB) was involved in the decision. The PEDro scale is composed of 11 items, one point is awarded for each satisfied item and a high total score reflects a higher methodological quality. Authors suggested that scores of up to 4 points were considered ‘poor’, 4 to 5 points were considered ‘fair’, 6 to 8 points were considered ‘good’ and 9 to 10 points were considered ‘excellent’ [15]. Therefore, only studies with score 6 were included as other authors have done [16].

3.5Data extraction

Two researchers (EP and FS) collected data from the included studies, using a standardized data extraction form. They extracted from the studies information related to the characteristics of the patients (sample number, age, gender), the type of the experimental and control interventions, the outcome measures, and the follow-up.

For the extraction of data and information regarding the intervention, the TIDieR checklist [9] was used by the two evaluators (EP and FS). TIDieR is composed of 12 items: name, purpose, materials, procedure, who provided the intervention, how, where, when and how much, modifications, tailoring and adherence. In order to create a summary score for the description of the intervention, we added the scores for both TIDieR items, the intervention group and the control group. Each item was assessed on the 3-points Likert scale (0 = not reported, 1 = partially reported, 2 = adequately reported) [17].

3.6Risk of bias in individual studies

The assessment of the risk of bias in the included studies was performed individually by two reviewers (EP and FS), using the Cochrane Collaboration tool [18], which identifies five bias domains: selection bias, performance bias, detection bias, attrition bias and reporting bias. The risk of bias was assessed as “low” if it is unlikely to seriously alter the results, “high” if it can alter them, and “unclear” if it raises any doubts about the influence on the results.

4.Results

4.1Study selection

Of the 6520 articles retrieved from the electronic databases, only 21 articles qualified for inclusion in this systematic review, according to the eligibility criteria of the study especially as regards the intervention. Detailed information on each of the phases of the study selection is reported in Fig. 1.

Figure 1.

Flow diagram.

Flow diagram.

4.2Study characteristics

The studies included in this systematic review were RCTs published in English language, between 2011 and 2018. Detail about the included studies are reported in Table 1. A total of 702 subjects with cLBP in the intervention group and 725 in the control group were analyzed. The sample size in the intervention groups and in the comparison group varies from a minimum of 10 to a maximum of 74 with an average in the intervention group of 33.4 subjects (SD = 16.9) and with an average of 34.5 in the comparison group of subjects (SD = 17.8).

In the intervention group 30% at least was female up to the maximum of 100% with an average age of 70.8 years (SD = 19.8). In the control group the proportion of females varies from a minimum of 36% to a maximum of 100% with an average age of 67.1 years (SD = 21.5). In two studies [19, 20] the percentage of females was not reported. The weighted average age in the intervention group is 69.5 years while in the control group is 64.0 years.

In the experimental group of the included studies, the intervention involved TE in different forms: low load motor control exercises [21, 22], stretching [23], lumbar stabilization exercises [19], strengthening [24], trunk balance exercises [25], slump stretching [26], McKenzie exercise [27] that could be made alone [28] or within a multimodal program [29, 30] in combination with manual therapy [31, 32] or education on pain neurophysiology [33]. The comparison intervention in the included studies consists of other forms of TE: high load lifting exercises [21] stretching [20] motor control exercises [24, 34], aerobic activity [19], muscle strengthening [24], water exercises [35], advice on Activity of Daily Living [36], manual therapy [37], Behavioural Graded Activity [19], usual activity [23] , sham therapy [32], and in a wait list treatment [38]. These types of intervention could be associated with each other [29], as mobilization with exercise [26] or performed alone [27]. The interventions in the experimental groups were performed either in groups [39] or individually, the same thing for the comparison groups.

Figure 2.

Evaluation risk of bias.

Evaluation risk of bias.

The primary outcomes mainly concerned the measurement of the pain or disability, except for some studies that considered the displacement of lumbar movements and quality of life questionnaires as the primary outcome. Secondary outcomes concerned pain or disability or quality of life, while for some studies, secondary outcomes are represented by lumbar Range of Motion, strength tests, endurance and motor control, the presence of painful positions, and kinesiophobia. In the included studies, the outcomes were assessed with final follow up ranging from a minimum of 6 weeks [25] to a maximum of 24 months [24].

4.3Methodological quality

The included studies, through the evaluation with the PEDro scale, were of good quality as they scored 6 to 8 points, with an average of 6.8 points (SD = 0.8). PEDro scores are reported in Table 1.

4.4Risk of bias within studies

The risk assessment of bias, performed through the Cochrane Collaboration tool, is reported in Fig. 2.

The risk of attrition bias and reporting bias was assessed as “low” in all studies included. The risk of selection bias, performance bias, detection bias, was assessed as “low” in 19 articles (90.4%), “unclear” in one article (4.8%) and “high” in one article (4.8%). The risk of selection bias (generation of the randomization sequence) was assessed as “low” in 18 articles (85.7%), “unclear” in 2 articles (9.5%) and “high” in one article (4.8%).

4.5Description of the interventions

The findings of the description, assessed through a TIDieR score, of the experimental and control interventions for each of the studies are reported in Table 2. Regarding the description of the experimental intervention a score ranging from a minimum of 8 to a maximum of 17 points (mean ± SD = 11.0 ± 2.6 points) was obtained. Only the items What- Procedures and When and How much were adequately reported in 20 articles (95.2% of the articles) and partially reported in 1 article (4.8%). Regarding the description of the control intervention, a score ranging from 0 points to 18 points (mean ± SD = 8.4 ± 4.7 points) was achieved.

5.Discussion

The aim of the systematic review was to assess reproducible therapeutic exercises for cLBP patients, using the TIDieR checklist. Reporting of interventions, especially in physiotherapy, is crucial as it influences the generalizability of the results; hence, the methods of the article should contain all the information necessary for the reader to be able to reproduce the intervention in clinical practice. The main findings on this topic consider the difficulty to have a clear description of the exercises, useful to combine the exercise therapy with new findings [40]. Our results showed that the TIDieR score is low in the description of both the experimental group and the control group in RCTs in patients with LBP; furthermore, many items were scarcely (or not at all) satisfied.

The interventions reported in Garcia et al. and in Aasa et al. RCT are the better reported [21, 27]. The study by Garcia et al. compares the effectiveness of Back School and McKenzie methods in patients with cLBP. The article provides detailed information about the intervention that makes it reproducible. For example, we know patients performed sessions of one-hour once a week for 4 weeks. All participants performed the exercises under the supervision of a physiotherapist. At the end of each session, the participants were asked to perform the same exercises at home, once a day, exercises well described and illustrated by photos. The directional preference could be modified during the sessions, if needed, and the therapist could increase the level of the exercises, tailoring the treatment according to the needs of each patient. The patient should perform the exercise of truck flexion for 3 sets of 10 repetitions

Table 2

TIDieR ’s score for experimental and control group

ReferenceGroupItem 1 Brief nameItem 2 WhyItem 3 What- MaterialsItem 4 What- ProceduresItem 5 Who providedItem 6 HowItem 7 WhereItem 8 When and how muchItem 9 TailoringItem 10 ModificationsItem 11 How well- PlannedItem 12 How well- ActualTotal score
Aasa et al., 2015Experimental22122222200017
Control22222222200018
Bello et al., 2015Experimental2102002200009
Control2102002200009
Balthazars et al., 2012Experimental22022002000010
Control2200000200006
Bello et al., 2018Experimental2202010200009
Control2202010200009
Chen et al., 2014Experimental0202102200009
Control0000000000000
Costantino et al., 2014Experimental2202000200008
Control2202000200008
Franca et al., 2012Experimental2202000200008
Control2202000200008
Garcia et al., 2012Experimental22022222100217
Control22022222110218
Gatti et al., 2011Experimental22020222200014
Control20020222200010
Jaromi et al., 2017Experimental2221000200009
Control2010000000003
Kim et al., 2016Experimental22020212000213
Control22120212000214
Michaelson et al., 2016Experimental22020202000212
Control2200000200028
Monteiro et al., 2015Experimental2202000200008
Control2002000200006
Nagrale et al., 2012Experimental22020122000011
Control2002012200009
Noormohammadpour et al., 2018Experimental22120022002013
Control0000000000200
Oliveira et al., 2017Experimental22021001200212
Control2002100100028
Pardo et al., 2017Experimental22020202100011
Control22020202000010
Rabin et al., 2014Experimental2022002000008
Control2022002000008
Segal-Snir et al., 2016Experimental22022202000012
Control2000000000002
Vergas et al., 2011Experimental22020202000010
Control22020202000010
Zafereo et al, 2018Experimental22022022000012
Control220220220000

and the patient had three possible positions. The level of increase was considered only when symptoms remained unchanged, and stopped if the symptoms worsened.

The study by Aasa et al. compared the effects of low-load motor control (LMC) exercise and those of a high-load lifting (HLL) exercise. The LMC intervention was performed individually and the HLL included groups of 5 participants. Participants were offered 12 treatment sessions over an 8-weeks period. The duration of each session was 20 to 30 minutes for the LMC group and 60 minutes for the HLL group. The physiotherapists used different forms of feedback to teach and facilitate correct performance during the exercises. Participants in the HLL group were instructed that a pain intensity under 50 mm on a Visual Analog Scale was acceptable while performing the deadlift, provided that the pain subsided after each completed set and the movement pattern/spinal neutral position did not change. In the LMC group, the exercises were individually selected with the aim to normalize the dominating movement impairment for each participant. The strategy was to start from a basic level and continue to a gradually increased level of difficulty. It was considered important to always perform the movements ideally, preferably with an optimal muscle recruitment pattern. Regarding the home exercises, the participants were encouraged to make at least 10 repetitions, 2 to 3 times a day, with the goal to incorporate the new movement pattern into daily life. In stages 2 and 3, the participants were encouraged to focus on muscle recruitment and movement pattern during the activities and to perform them as often as possible. The physiotherapist selected appropriate initial weight on the bar, taught the participants an optimal lifting technique and ensured that the participants maintained a neutral alignment of the spine when performing the exercise. During the intervention period, the load was slowly increased, gradually increasing the number of lifts and/or the weight on the bar. The participants were encouraged to use the same lifting technique during daily activities. Both interventions resulted in significant within-group improvements in reduced pain intensity, strength, and endurance. The LMC group showed significantly greater improvement on the Patient-Specific Functional Scale compared with the HLL group (p-value < 0.001). There were no significant differences between groups in pain intensity, strength, and endurance in any of these three tests.

The more relevant TIDieR items allowing replication are item 3 (What materials), item 8 (When and how much) and item (How)

In this review, in the interventions of the experimental groups, the item 3 (Materials) was not reported in 18 articles (85.7%), partially reported in two articles (9.5%) and adequately reported only in one (4.8%) study.

Item 6 (How) was not reported in 11 articles (52.4%), partially reported in two articles (9.5%) and adequately reported in item 8 (When and How Much) articles (38.1%).

Item 8 (When and How Much) was partially reported in one article (4.8%) and adequately reported in 20 articles (95.2%).

This review confirms the difficulty to find studies with a regular comprehensive reporting.

Figure 3.

TIDieR SCORE.

TIDieR SCORE.

The items most poorly described in the experimental group, (Fig. 3) was item 3 (Materials), item 5 (Who provided), item 6 (How) [41], item 7 (Where), item 9 (Personalizing), item 10 (Modifications) and items 11 and 12 (Adherence). Lack of comprehensive reporting and monitoring of interventions makes it difficult for therapists to put exercises into practice and to make correct assumptions about exercise effectiveness, if it is unclear whether patients adhered to the protocol.

In control groups the interventions are less well-reported than in the experimental group, this is also documented in another study [42].

In addition, the items 11 and 12 (Adherence) in most of the cases are absent, even if it is considered as one of the important barriers for the efficacy of the exercise [43]. Hence, in clinical practice, during the planning of the exercise, the clinician implements strategies to improve the adherence of the exercise; these strategies should be reported in clinical trials to allow the clinician to be able to reproduce the exercise in all its aspects

The Good methodological quality of the studies considered does not coincide with an adequate and complete description of the interventions.

The results of the present study are in line with the study by Yamato et al. that considers the weakness of the exercise description in lots of trials. Of the intervention groups 23% report only half of the TIDieR items, and in the control group these data increase to 75% of the trials [11]. This is because most of the time exercises are described as “usual care” or “conventional treatment” without specifying the treatment modality, thus creating a barrier for the reproducibility [44]. For instance, the advice of an exercise is suggested to patients in only 19% of the cases during the usual care [44]. At the same time, the low reporting for the item Tailoring and Modification, items 9 and 10, is a serious shortcoming because during clinical practice often some modifications are needed [45].

The remarkable incompleteness of information necessary for intervention replication calls for actions [46, 47]. To address the problem of poor description of interventions within RCTs, we recommend that the TIDieR checklist be adopted by journals as a mandatory tool for guiding authors and reviewers [11, 48]. Many journals have limits on words; however, electronic resources can be used to provide more complete descriptions with interventions. For more complex interventions that are common in physiotherapy, using easily accessible videos or websites that demonstrate interventions used [49] should be considered. Such initiatives will reduce time wasted on futile and unproductive efforts and improve the applicability of the research. Finally, authors of systematic reviews and meta-analyses should consider the completeness of intervention descriptions as essential aspects for the evaluation of the usefulness of research evidence.

Wherever possible, the TIDieR checklist as well as other analytical reporting tools should guide the research of authors, reviewers and publishers in the various stages of publication. We need good quality research results that can be used and applied in a concrete and appropriate way.

This systematic review has limitations that should be discussed. Only 21 items were included out of over 6500 items found. Probably by broadening the inclusion criteria, probably more articles may have been included. Therefore this could limit the generalizability of the results to all types of low back pain. Furthermore, having included a wide range of age of patients (greater than 18 years), could be considered with a limit; on the other hand, the results of this systematic review can be applied to adult patients with LBP. Besides, it was not possible to perform a meta-analysis. For this reason, no new evidence can be seen throughout this study.

6.Conclusion

The findings of this study show defective reporting on interventions in high quality RCT on chronic low back pain (cLBP) is defective, jeopardizing the external validity of the results. More attention should be paid by researchers to the complete and accurate description of interventions reported in their studies in order to make them replicable in clinical practice. In the intervention of the exercise therapy proposed in a study the suggestion is to specify the intensity, the dose, the repetitions and the possibility to modify the program based for example in the improvement of the patient; in this way is very easy for the clinicians put into practice what the literature finds efficacy. Furthermore is important to considerate as outcome not only pain and the function but also the disability induced and perceived with cLBP.

The present authors wish to emphasize the urgent need for a call for action for researchers to use the TIDieR checklist in planning their exercise interventions to improve the replicability and the transparency of studies.

In the present study the interventions reported in Garcia et al. and in Aasa et al. RCTs, are considered as the better reported [21, 27]. In both these studies the score of the intervention description was 17 points for the experimental group and 18 points for the control group. Their articles provide detailed information about the interventions that make them reproducible by a physiotherapist.

Conflict of interest

None to report.

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Appendices

Appendix

Search strings.

Pubmed((Back pain [Mesh]) OR (Low Back Pain [Mesh]) OR (Back Injuries [Mesh]) OR (LBP) OR (CLBP) OR (Backache) OR (Lumbago) OR (Back Injur*) OR (Lumbar pain) OR (Back disorde*) OR (Back Pain)) AND (“Exercise”[Mesh] OR “Exercise Movement Techniques”[Mesh] OR “Exercise Therapy”[Mesh] OR (Exercis*)) AND ((randomized[Title/Abstract] AND controlled[Title/Abstract] AND trial [Title/Abstract]) OR (randomised[Title/Abstract] AND controlled[Title/Abstract] AND trial[Title/Abstract]) OR ((“Randomized Controlled Trials as Topic”[Mesh]) OR “Randomized Controlled Trial” [Publication Type])) Using filter HUMANS Using filter RANDOMIZED CONTROLLED TRIAL
CINAHL(TX+randomised+controlled+trial+OR+PT+randomised+control+trial+OR+TX+randomized+control+trial+OR+PT+ randomized+control+trial) +AND+((TX+back+pain+OR+TX+low+back+pain+OR+TX+back+injury+OR+TX+lbp +OR+TX+clbp+OR+TX+backache+OR+TX+lumbago+OR+TX+back+injur*+OR+TX+lumbar+pain+OR+TX+ back+disorde*+OR+TX+back+pain) +AND+ ((TX+exercise)+OR+(TX+exercise+movement+techniques)+OR+ (TX+exercise+therapy)+OR+(TX+Exercis*))+AND+((TX+randomized)+AND+(TX+controlled)+AND+(TX+trial)) +AND+((TX+randomised)+AND+(TX+controlled)+AND+(TX+trial))+AND+((TX+randomised+controlled+trial)+ OR+(PT+randomised+control+trial)+OR+ (TX+randomized+control+trial)+OR+ (PT+ randomized+ control+trial)))
PEDroExercise AND “back pain” Using filter Method: Clinica trial
EMBASE(‘low back pain’/exp OR ‘low back pain’ OR (low AND (‘back’/exp OR back) AND (‘pain’/exp OR pain)) OR lbp OR clbp OR ‘backache’/exp OR backache OR ‘lumbago’/exp OR lumbago OR ‘lumbar pain’/exp OR ‘lumbar pain’ OR (lumbar AND (‘pain’/exp OR pain)) OR ((‘back’/exp OR back) AND disorde*) OR ‘back pain’/exp OR ‘back pain’ OR ((‘back’/exp OR back) AND (‘pain’/exp OR pain))) AND (‘exercise’/exp OR exercis*) AND ((randomized AND controlled AND trial) OR ‘randomized controlled trial’:it OR (randomised AND controlled AND trial))
Scopus(((TITLE-ABS-KEY (randomized AND controll ed AND trials) OR SRCTITLE (randomized A ND controlled AND trial)) AND DOCTYPE (ar OR re)) OR ((TITLE-ABS-KEY (randomised) AND TITLE-ABS-KEY (controlled) AND TITLE-ABS-KEY (trial)) AND DOCTYPE (ar OR re)) OR ((TITLE-ABS-KEY (randomized) AND TITLE-ABS-KEY (controlled) AND TIT LE-ABS-KEY (trial)) AND DOCTYPE (ar OR re))) AND ((TITLE-ABS-KEY (back AND pain) OR TITLE-ABS-KEY (low AND back AND pain) OR TITLE-ABS-KEY (back AND injures) OR TITLE-ABS-KEY (lbp) OR TITLE-ABS-K EY (clbp) OR TITLE-ABS-KEY (backache) OR TITLE-ABS-KEY (lumbago) OR TITLE-ABSKEY (back AND injur*) OR TITLE-ABS-KEY (lumbar AND pain) OR TITLE-ABS-KEY (back AND disorde*) OR TITLE-ABS-KEY (back AND pain)) AND DOCTYPE (ar OR re)) AN D ((TITLE-ABS-KEY (exercise) OR TITLE-AB S-KEY (exercise AND movement AND techniq ues) OR TITLE-ABS-KEY (exercis*) OR TITL E-ABS-KEY (exercise AND therapy))) AND (LI M IT-TO (DOCTYPE , ‘ar’))