Choosing the right outcome measurement instruments for patients with low back pain

Exploring the association between adherence to home-based exercise recommendations and recovery of nonspecific low back pain: a prospective cohort study

BACKGROUND

Adherence to home-based exercise (HBE) recommendations is critical in physiotherapy for patients with low back pain (LBP). However, limited research has explored its connection with clinical outcomes. This study examined how adherence to HBE relates to changes in physical function, pain intensity, and recovery from LBP in patients undergoing physiotherapy treatment.

METHODS

Data from a multicenter cluster randomized controlled trial in the Netherlands involving patients with LBP from 58 primary care physiotherapy practices were used. Adherence to HBE was assessed with the Exercise Adherence Scale (EXAS) at each treatment session. Previously identified adherence trajectories served as a longitudinal measure of adherence and included the classes "declining adherence" (12% of participants), "stable adherence" (45%), and "increasing adherence" (43%). The main outcomes included disability (Oswestry Disability Index), pain (Numeric Pain Rating Scale), and recovery (pain-free for > 4 weeks), which were measured at baseline and after three months. Linear and binomial logistic regression analyses adjusted for confounders were used to examine adherence-outcome relationships.

RESULTS

In the parent trial, 208 participants were included. EXAS scores were available for 173 participants, collected over a median of 4.0 treatment sessions (IQR 3.0 to 6.0). Forty-five (28.5%) patients considered themselves to have recovered after three months. The median changes in the Oswestry Disability Index and Numeric Pain Rating Scale were - 8 (IQR - 1 to -20) and - 2 (IQR - 0.5 to -4), respectively. The mean EXAS scores varied among patient classes: "declining adherence" (46.0, SD 19.4), "stable adherence" (81.0, SD 12.4), and "increasing adherence" (39.9, SD 25.3), with an overall mean of 59.2 (SD 25.3). No associations between adherence and changes in physical functioning or pain were found in the regression analyses.

CONCLUSIONS

No association between adherence to HBE recommendations and changes in clinical outcomes in patients with LBP was found. These findings suggest that the relationship between adherence to HBE recommendations and treatment outcomes may be more complex than initially assumed. Further research using detailed longitudinal data combined with qualitative methods to investigate patient motivation and beliefs may lead to a deeper understanding of the relationship between adherence and clinical outcomes in patients with LBP.

Substantial discrepancies exist between registered protocol and published manuscript in trials on exercise interventions for chronic low back pain: a metaresearch study

OBJECTIVES

Reporting bias, prevalent in biomedical fields, can undermine evidence credibility. Our objective was to evaluate the proportion of discrepancies between registered protocols and published manuscripts in randomized controlled trials (RCTs) on exercise interventions for patients with chronic low back pain (CLBP).

STUDY DESIGN AND SETTING

We conducted a cross-sectional meta-research study, starting from the 2021 "Exercise therapy for CLBP" Cochrane Review. We selected all RCTs reporting a protocol registration on a primary register of the World Health Organization (WHO) International Clinical Trials Registry Platform (ICTRP) or in ClinicalTrials.gov. We extracted data from both registered protocol and published manuscript of RCTs, collecting recruitment and administrative information (eg, record dates) and details of trial characteristics (eg, outcomes, arms, statistical analysis plan details [SAPs]). Independent pairs of reviewers assessed discrepancies between registered protocol and published manuscript for the reporting of primary and secondary outcomes domains, measurement instruments, time-points, number of arms and SAPs(if attached). Outcome discrepancies were characterized as addition, omission, upgrade or downgrade.

RESULTS

We included 116 RCTs reporting an available protocol registration. Overall, 100 RCTs (86.2%) distinguished between primary and secondary outcomes. Of these, 39 RCTs (39.0%) reported one or more discrepancies in primary outcomes, and 78 RCTs (78.0%) reported one or more discrepancies in secondary outcomes. Focusing on discrepancies for the primary outcome, 64.5% of added, upgraded or downgraded outcomes favored statistically significant effects. Few RCTs (n = 6) reported discrepancies in the number of arms. SAPs were poorly reported in the registered protocols (n = 3) for being compared to the publications.

CONCLUSION

We found substantial outcome discrepancies comparing registered protocols and published manuscripts in RCTs assessing exercise interventions for patients with CLBP, with some impacting the statistical significance of the effects. Readers are encouraged to approach RCTs results in this field with caution.

Cryoneurolysis versus radiofrequency ablation outcome on pain experience in chronic low back pain (COPE): a single-blinded randomised controlled trial

OBJECTIVE

A comparison of cryoneurolysis or radio frequency (RF) with placebo in patients with facetogenic chronic low back pain (LBP) for patient global impression of change (PGIC), pain intensity, function and quality of life, with 1-year follow-up.

DESIGN

Single-centre, single-blinded placebo-controlled randomised controlled trial.

SETTING

Single-centre study.

PARTICIPANTS

Inclusion from March 2020 to September 2022: consenting adults over 18 years of age, LBP>3 months, average Numeric Rating Scale LBP≥4 average last 14 days and a positive response to a diagnostic medial branch block (>50% pain reduction after 60 min).

INTERVENTIONS

120 patients were block randomised 1:1:1 to cryoneurolysis, RF or placebo of the medial branch nerves. Physical therapy was added after 4 weeks for all groups.

MAIN OUTCOME MEASURES

Primary outcome was PGIC 4 weeks after the intervention. Secondary outcomes included pain intensity (Numeric Rating Scale, NRS), quality of life (Short Form 36, EQ-5D-5L), disability (Oswestry Disability Index), depression (Major Depression Inventory) and catastrophising (Pain Catastrophising Scale). Outcomes were measured at 4 weeks, 3, 6 and 12 months.

RESULTS

There was no statistically significant difference in PGIC at 4 weeks between cryoneurolysis and placebo (risk ratio (RR) 2; 95% CI 0.75 to 5.33, p=0.17) and RF and placebo (RR 1.6; 95% CI 0.57 to 4.49, p=0.37), except PGIC for cryoneurolysis at 6-month follow-up (RR 5.1; 95% CI 1.20 to 22.03, p=0.03). No statistically significant differences were found in secondary follow-up endpoints.

CONCLUSIONS

Denervation of the medial branch nerve by either cryoneurolysis or RF compared with placebo did not demonstrate significant improvement in PGIC, pain intensity, function and quality of life in patients with facetogenic chronic LBP at short-term or long-term follow-up.

TRIAL REGISTRATION NUMBER

NCT04786145.

Time to Service and Its Relationship with Outcomes in Workers with Compensated Musculoskeletal Conditions: A Scoping Review

PURPOSE

A comprehensive review of the literature on the time between the onset of symptoms and the first episode of care and its effects on important worker outcomes in compensated musculoskeletal conditions is currently lacking. This scoping review aimed to summarize the factors associated with time to service and describe outcomes in workers with workers' compensation accepted claims for musculoskeletal conditions.

METHODS

We used the JBI guidelines for scoping reviews and reported following the PRISMA-ScR protocol. We included peer-reviewed articles published in English that measured the timing of health service initiation. We conducted searches in six databases, including Medline (Ovid), Embase (Ovid), PsycINFO, Cinahl Plus (EBSCOhost), Scopus, and the Web of Science. Peer-reviewed articles published up to November 01, 2022 were included. The evidence was summarized using a narrative synthesis.

RESULTS

Out of the 3502 studies identified, 31 were included. Eight studies reported the factors associated with time to service. Male workers, availability of return to work programmes, physically demanding occupations, and greater injury severity were associated with a shorter time to service, whereas female workers, a high number of employees in the workplace, and having legal representation were associated with a longer time to service. The relationship between time service and worker outcomes was observed in 25 studies, with early access to physical therapy and biopsychosocial interventions indicating favourable outcomes. Conversely, early opioids, and MRI in the absence of severe underlying conditions were associated with a longer duration of disability, higher claim costs, and increased healthcare utilization.

CONCLUSION

Existing evidence suggests that the time to service for individuals with compensated musculoskeletal conditions was found to be associated with several characteristics. The relationship between time to service and worker outcomes was consistently indicated in the majority of the studies. This review highlights the need to consider patient-centred treatments and develop strategies to decrease early services with negative effects and increase access to early services with better outcomes.

Painful differences between different pain scale assessments: The outcome of assessed pain is a matter of the choices of scale and statistics

OBJECTIVES

Perceived pain is a multi-factorial subjective variable, commonly measured by numeric rating scales, verbal descriptive scales (VDS), or by a position on an analogue line (VAS). A major question is whether an individual's VAS and VDS pain assessments, on the same occasion, could be comparable. The aim was to compare continuous and discretized VAS pain data with verbal descriptive pain datasets from the Oswestry Disability Index (ODI) and the European Quality of Life Scale (EQ-5D) in paired pain datasets.

METHODS

The measurement level of data from any type of scale assessments is ordinal, having rank-invariant properties only. Non-parametric statistical methods were used. Two ways of discretizing the VAS-line to VAS-intervals to fit the number of the comparing VDS-categories were used: the commonly used (equidistant VAS,VDS)-pairs and the (unbiased VAS,VDS)-pairs of pain data. The comparability of the (VAS,VDS)-pairs of data of perceived pain was studied by the bivariate ranking approach. Hence, each pair will be regarded as ordered, disordered, or tied with respect to the other pairs of data. The percentage agreement, PA, the measures of disorder, D, and of order consistency, MA, were calculated. Total interchangeability requires PA = 1 and MA = 1.

RESULTS

The wide range of overlapping of (VAS,VDS)-pairs indicated that the continuous VAS data were not comparable to any of the VDS pain datasets. The percentage of agreement, PA; in the (equidistant VAS,ODI) and (equidistant VAS, EQ-5D) pairs were 38 and 49%, and the order consistency, MA, was 0.70 and 0.80, respectively. Corresponding results for the (unbiased VAS,VDS)-pairs of pain data were PA: 54 and 100%, and MA: 0.77 and 1.0.

CONCLUSION

Our results confirmed that perceived pain is the individual's subjective experience, and possible scale-interchangeability is only study-specific. The pain experience is not possible to be measured univocally, but is possible for the individual to rate on a scale.

Trajectories of Adherence to Home-Based Exercise Recommendations Among People With Low Back Pain: A Longitudinal Analysis

OBJECTIVE

This study aimed to examine the presence of distinct trajectories of adherence to home-based exercise recommendations among people with low back pain (LBP). This study also aimed to identify differences in baseline characteristics among groups.

METHODS

This study was a secondary analysis of a prospective, multicenter cluster randomized controlled trial investigating the cost-effectiveness of a stratified blended physical therapist intervention compared to usual care physical therapy in patients with LBP. The intervention group received usual care with integrated support via a smartphone app. A total of 208 patients were recruited from 58 primary care physical therapist practices. Baseline data included patient characteristics, physical functioning, pain intensity, physical activity, fear avoidance, pain catastrophizing, self-efficacy, self-management ability, and health-related quality of life. The Exercise Adherence Scale (score range = 0-100) was used to measure adherence during each treatment session. Latent class growth analysis was used to estimate trajectories of adherence.

RESULTS

Adherence data were available from 173 out of 208 patients (83%). Data were collected during an average of 5.1 (standard deviation [SD] = 2.5) treatment sessions, with total treatment duration of 51 (SD = 41.7) days. Three trajectory classes were identified: "declining adherence" (12%), "stable adherence" (45%), and "increasing adherence" (43%). No differences in baseline characteristic were found between groups.

CONCLUSION

Three adherence trajectories to exercise recommendations were identified in patients with LBP. However, baseline characteristics cannot identify a patient's trajectory group.

IMPACT

Despite the presence of distinct trajectories of adherence in patients with LBP, physical therapists should not attempt to place a patient in a trajectory group at the start of treatment. Instead, adherence should be closely monitored as treatment progresses and supported when required as part of an ongoing process.

Effectiveness of m-health-based core strengthening exercise and health education for public safety workers with chronic non-specific low back pain: study protocol for a superiority randomized controlled trial (SAFEBACK)

BACKGROUND

Low back pain (LBP) is the leading cause of years lived with disability worldwide. Public safety workers are highly exposed to physically demanding activities and inappropriate postures, increasing the risk of experiencing LBP. Smartphone app-based self-managed interventions may be an alternative for chronic non-specific LBP (CNSLBP) treatment. This study aims to evaluate the effectiveness of a smartphone app-based self-managed exercise program plus health education, compared to a health education program alone, on neuromuscular and perceptual outcomes in police officers and firefighters with CNSLBP.

METHODS

This is a parallel, two-armed, blinded evaluator randomized clinical trial. Police officers and firefighters (from public safety institutions in the Rio Grande do Sul state, Brazil) will be randomly assigned to a m-health self-managed exercise program (twice a week) plus health education or health education alone. Self-management exercise program components are mobility and core resistance exercises, available on the app. Follow-ups will be conducted post-treatment (8 weeks) and 16 weeks after randomization. The co-primary outcomes will be pain intensity and disability post-treatment (8 weeks). Secondary outcomes will be biopsychosocial factors related to CNSLBP.

DISCUSSION

We hypothesize that the effects of a smartphone app-based self-managed exercise program on co-primary and secondary outcomes will be superior, compared to the health education only in public safety workers with CNSLBP.

TRIAL REGISTRATION

The study was prospectively registered at ClinicalTrials.gov (NCT05481996. Registered on August 01, 2022).

Efficacy of pulsed electromagnetic field therapy on pain and physical function in patients with non-specific low back pain: a systematic review

INTRODUCTION

Non-specific low back pain is a common and clinically significant condition with substantial socioeconomic implications. Pulsed electromagnetic field (PEMF) therapy has shown benefits in pain reduction and improvement of physical function in patients with pain-associated disorders like osteoarthritis. However, studies had heterogeneous settings. The aim of this study was to assess the effects of PEMF on pain and function on patients with non-specific low back pain.

METHODS

A systematic literature search of randomized controlled trials in PubMed, MEDLINE, EMBASE, Cochrane Library, and PEDro was performed (from inception until 15/5/2023). Outcome measures assessed pain and function.

RESULTS

Nine randomized controlled trials with 420 participants (n = 420) were included. The studies compared PEMF vs. placebo-PEMF, PEMF and conventional physical therapy vs. conventional physical therapy alone, PEMF and conventional physical therapy vs. placebo-PEMF and conventional physical therapy, PEMF vs. high-intensity laser therapy (HILT) vs. conventional physical therapy, and osteopathic manipulative treatment (OMT) and PEMF vs. PEMF alone vs. placebo-PEMF vs. OMT alone. Five of the nine included studies showed statistically significant pain reduction and improvement in physical function in comparison to their control groups (p < 0.05). There was substantial heterogeneity among the groups of the study, with a wide range of duration (10-30 min), treatments per week (2-7/week), applied frequencies (3-50 Hz), and intensities (2mT-150mT). No serious adverse event had been reported in any study. The included studies showed solid methodological quality, with an overall score of 7.2 points according to the PEDro scale.

CONCLUSION

PEMF therapy seems to be a safe and beneficial treatment option for non-specific low back pain, particularly if used as an addition to conventional physical therapy modalities. Future research should focus on standardized settings including assessment methods, treatment regimens, frequencies, and intensities.

Effectiveness and Cost-Effectiveness of a Stratified Blended Physiotherapy Intervention Compared With Face-to-Face Physiotherapy in Patients With Nonspecific Low Back Pain: Cluster Randomized Controlled Trial

BACKGROUND

Nonspecific low back pain (LBP) is a leading contributor to disability worldwide, and its socioeconomic burden is substantial. Self-management support is an important recommendation in clinical guidelines for the physiotherapy treatment of patients with LBP and may support cost-effective management. However, providing adequate individually tailored self-management support is difficult. The integration of web-based applications into face-to-face care (ie, blended care) seems promising to optimize tailored treatment and enhance patients' self-management and, consequently, may reduce LBP-related costs.

OBJECTIVE

We aimed to evaluate the long-term effectiveness and cost-effectiveness of stratified blended physiotherapy (e-Exercise LBP) compared with face-to-face physiotherapy in patients with nonspecific LBP.

METHODS

An economic evaluation was conducted alongside a prospective, multicenter, cluster randomized controlled trial in primary care physiotherapy. Patients with nonspecific LBP were treated with either stratified blended physiotherapy (e-Exercise LBP) (n=104) or face-to-face physiotherapy (n=104). The content of both interventions was based on the Dutch physiotherapy guidelines for nonspecific LBP. Blended physiotherapy was stratified according to the patients' risk of developing persistent LBP using the STarT Back Screening Tool. The primary clinical outcome was physical functioning (Oswestry Disability Index version 2.1a). For the economic evaluation, quality-adjusted life years (QALYs; EQ-5D-5L) and physical functioning were the primary outcomes. Secondary clinical outcomes included fear avoidance beliefs and self-reported adherence. Costs were measured from societal and health care perspectives using self-report questionnaires. Effectiveness was estimated using linear mixed models. Seemingly unrelated regression analyses were conducted to estimate total cost and effect differences for the economic evaluation.

RESULTS

Neither clinically relevant nor statistically substantial differences were found between stratified blended physiotherapy and face-to-face physiotherapy regarding physical functioning (mean difference [MD] -1.1, 95% CI -3.9 to 1.7) and QALYs (MD 0.026, 95% CI -0.020 to 0.072) over 12 months. Regarding the secondary outcomes, fear avoidance beliefs showed a statistically significant improvement in favor of stratified blended physiotherapy (MD -4.3, 95% CI -7.3 to -1.3). Societal and health care costs were higher for stratified blended physiotherapy than for face-to-face physiotherapy, but the differences were not statistically significant (societal: €972 [US $1027], 95% CI -€1090 to €3264 [US -$1151 to $3448]; health care: €73 [US $77], 95% CI -€59 to €225 [US -$62 to $238]). Among the disaggregated cost categories, only unpaid productivity costs were significantly higher for stratified blended physiotherapy. From both perspectives, a considerable amount of money must be paid per additional QALY or 1-point improvement in physical functioning to reach a relatively low to moderate probability (ie, 0.23-0.81) of stratified blended physiotherapy being cost-effective compared with face-to-face physiotherapy.

CONCLUSIONS

The stratified blended physiotherapy intervention e-Exercise LBP is neither more effective for improving physical functioning nor more cost-effective from societal or health care perspectives compared with face-to-face physiotherapy for patients with nonspecific LBP.

TRIAL REGISTRATION

ISRCTN 94074203; https://www.isrctn.com/ISRCTN94074203.

INTERNATIONAL REGISTERED REPORT IDENTIFIER (IRRID)

RR2-10.1186/s12891-020-3174-z.

Pain Education and Knowledge (PEAK) Consensus Guidelines for Neuromodulation: A Proposal for Standardization in Fellowship and Training Programs

The need to be competent in neuromodulation is and should be a prerequisite prior to completing a fellowship in interventional pain medicine. Unfortunately, many programs lack acceptable candidates for these advanced therapies, and fellows may not receive adequate exposure to neuromodulation procedures. The American Society of Pain and Neuroscience (ASPN) desires to create a consensus of experts to set a minimum standard of competence for neurostimulation procedures, including spinal cord stimulation (SCS), dorsal root ganglion stimulation (DRG-S), and peripheral nerve stimulation (PNS). The executive board of ASPN accepted nominations for colleagues with excellence in the subject matter of neuromodulation and physician education. This diverse group used peer-reviewed literature and, based on grading of evidence and expert opinion, developed critical consensus guides for training that all accredited fellowship programs should adopt. For each consensus point, transparency and recusal were used to eliminate bias, and an author was nominated for evidence grading oversight and bias control. Pain Education and Knowledge (PEAK) Consensus Guidelines for Neuromodulation sets a standard for neuromodulation training in pain fellowship training programs. The consensus panel has determined several recommendations to improve care in the United States for patients undergoing neuromodulation. As neuromodulation training in the United States has evolved dramatically, these therapies have become ubiquitous in pain medicine. Unfortunately, fellowship programs and the Accreditation Council for Graduate Medical Education (ACGME) pain program requirements have not progressed training to match the demands of modern advancements. PEAK sets a new standard for fellowship training and presents thirteen practice areas vital for physician competence in neuromodulation.

Optimising management of low back pain through the pain and disability drivers management model: Findings from a pilot cluster nonrandomised controlled trial

INTRODUCTION

Low back pain (LBP) remains the leading cause of disability. The Low Back Pain and Disability Drivers Management (PDDM) model aims to identify the domains driving pain and disability to guide clinical decisions. The objectives of this study were to determine the feasibility of conducting a pragmatic controlled trial of the PDDM model and to explore its effectiveness compared to clinical practice guidelines' recommendations for LBP management.

METHODS

A pilot cluster nonrandomised controlled trial. Participants included physiotherapists and their patients aged 18 years or older presenting with a primary complaint of LBP. Primary outcomes were the feasibility of the trial design. Secondary exploratory analyses were conducted on LBP-related outcomes such as pain severity and interference at 12-week follow-up.

RESULTS

Feasibility of study procedures were confirmed, recruitment exceeded our target number of participants, and the eligibility criteria were deemed suitable. Lost to follow-up at 12 weeks was higher than expected (43.0%) and physiotherapists' compliance rates to the study protocol was lower than our predefined threshold (75.0% vs. 57.5%). A total of 44 physiotherapists and 91 patients were recruited. Recommendations for a larger scale trial were formulated. The PDDM model group demonstrated slightly better improvements in all clinical outcome measures compared to the control group at 12 weeks.

CONCLUSION

The findings support the feasibility of conducting such trial contingent upon a few recommendations to foster proper future planning to determine the effectiveness of the PDDM model. Our results provide preliminary evidence of the PDDM model effectiveness to optimise LBP management.

CLINICAL TRIAL REGISTRATION

Clinicaltrial.gov, NCT04893369.

Identifying domains of health-related quality of life: the perspective of individuals with low back pain

BACKGROUND

Identifying the most relevant HRQOL domains for LBP from the perspective of individuals with lived experience with LBP is necessary to prioritize domains that will be most informative for evaluating the impact of pain and interventions while overcoming the burden of using long-form assessment tools. This study aimed to identify which domains of HRQOL are most important from the perspective of individuals with chronic LBP.

METHODS

Semi-structured interviews were conducted with 26 individuals with LBP. Participants first responded to questions related to the impact of their LBP on their HRQOL. Then, using a card sorting method, they were asked to select and indicate HRQOL domains that were most relevant to them from a list of 18 cards that represented different HRQOL domains. Participants were asked to explain the reasoning for their selection.

RESULTS

Participants identified physical activity restriction (50%), severity of pain (31%), social activity restriction (23%), and work performance restriction (23%) as the most important domains. The most frequently selected HRQOL domains during card sorting were social function (69%), pain intensity (62%), physical function (58%), fatigue (58%), and pain interference (42%).

CONCLUSION

The most important domains of HRQOL perceived by participants were pain intensity, social function, physical function, fatigue, and pain interference. Identifying these domains will inform clinical decision-making and guide treatment choices for health care providers.

Reduction in pain-related fear is not associated with improvement in spinal biomechanics but with decrease in movement-evoked pain in patients with chronic low back pain

BACKGROUND AND AIMS

While a causal relationship between pain-related fear and spinal movement avoidance in patients with chronic low back pain (CLBP) has frequently been postulated, evidence supporting this relationship is limited. This study aimed to test if decreases in pain-related fear or catastrophizing were associated with improvements in spinal biomechanics, accounting for possible changes in movement-evoked pain.

METHODS

Sixty-two patients with CLBP were assessed before and after an interdisciplinary rehabilitation program (IRP). Pain-related fear was assessed with general and task-specific measures. Lower and upper lumbar angular amplitude and velocity as well as paraspinal muscle activity were recorded during five daily-life tasks to evaluate spinal biomechanics. Relationships were tested with multivariable linear regression analyses.

RESULTS

The large decreases in pain-related fear and catastrophizing following the IRP were scarcely and inconsistently associated with changes in spinal biomechanics (< 3% of the models reported a statistically significant association). Results remained comparable for activities inducing more or less fear, for specific or general measures of pain-related fear, and for analyses performed on the entire population or limited to subgroups of patients with higher levels of task-specific fear. In contrast, reductions in task-specific pain-related fear were significantly associated with decreases in movement-evoked pain in all tasks (r = 0.26-0.62, p ≤ 0.02).

CONCLUSION

This study does not support an association between pain-related fear and spinal movement avoidance. However, it provides evidence supporting a direct relationship between decreased pain-related fear and decreased movement-evoked pain, possibly explaining some mechanisms of the rehabilitation programs.

Matching the Outcomes to Treatment Targets of Exercise for Low Back Pain: Does it Make a Difference? Results of Secondary Analyses From Individual Patient Data of Randomised Controlled Trials and Pooling of Results Across Trials in Comparative Meta-analysis

OBJECTIVE

To explore whether using a single matched or composite outcome might affect the results of previous randomized controlled trials (RCTs) testing exercise for non-specific low back pain (NSLBP). The first objective was to explore whether a single matched outcome generated greater standardized mean differences (SMDs) when compared with the original unmatched primary outcome SMD. The second objective was to explore whether a composite measure, composed of matched outcomes, generated a greater SMD when compared with the original primary outcome SMD.

DESIGN

We conducted exploratory secondary analyses of data.

SETTING

Seven RCTs were included, of which 2 were based in the USA (University research clinic, Veterans Affairs medical center) and the UK (primary care clinics, nonmedical centers). One each were based in Norway (clinics), Brazil (primary care), and Japan (outpatient clinics).

PARTICIPANTS

The first analysis comprised 1) 5 RCTs (n=1033) that used an unmatched primary outcome but included (some) matched outcomes as secondary outcomes, and the second analysis comprised 2) 4 RCTs (n=864) that included multiple matched outcomes by developing composite outcomes (N=1897).

INTERVENTION

Exercise compared with no exercise.

MAIN OUTCOME MEASURES

The composite consisted of standardized averaged matched outcomes. All analyses replicated the RCTs' primary outcome analyses.

RESULTS

Of 5 RCTs, 3 had greater SMDs with matched outcomes (pooled effect SMD 0.30 [95% confidence interval {CI} 0.04, 0.56], P=.02) compared with an unmatched primary outcome (pooled effect SMD 0.19 [95% CI -0.03, 0.40] P=.09). Of 4 composite outcome analyses, 3 RCTs had greater SMDs in the composite outcome (pooled effect SMD 0.28 [95% CI 0.05, 0.51] P=.02) compared with the primary outcome (pooled effect SMD 0.24 [95% CI -0.04, 0.53] P=.10).

CONCLUSIONS

These exploratory analyses suggest that using an outcome matched to exercise treatment targets in NSLBP RCTs may produce greater SMDs than an unmatched primary outcome. Composite outcomes could offer a meaningful way of investigating superiority of exercise than single domain outcomes.

A systematic review shows minimal evidence for measurement properties of psychological functioning outcomes in whiplash

OBJECTIVES

The aim of this study was to systematically identify, synthesize, and appraise studies on the measurement properties of patient-reported outcome measures (PROMs) for anxiety, depression, fear of movement, pain catastrophizing, post-traumatic stress, self-efficacy, and stress in people with whiplash-associated disorders (WAD).

STUDY DESIGN AND SETTING

PsycINFO, MEDLINE, EMBASE, CINAHL, PILOTS, Web of Science, and Scopus were searched (November 9, 2021). Studies evaluating any measurement property of relevant PROMs in WAD were included. Two reviewers independently screened the studies and assessed the measurement properties in accordance with the COSMIN guidelines.

RESULTS

Measurement properties of 10 PROMs were evaluated in WAD: Pictorial Fear of Activity Scale-Cervical (PFActS-C), Tampa Scale of Kinesiophobia-11, Pain Catastrophizing Scale (PCS), Pain Self-Efficacy Questionnaire (PSEQ), PSEQ-4 item, PSEQ-2a, PSEQ-2b, Self-Efficacy Scale, Harvard Trauma Questionnaire, and Post-Traumatic Stress Diagnostic Scale. Content validity was not examined in any of these PROMs in whiplash. Moderate- or high-quality evidence showed adequate internal structure for the PSEQ, PCS, and PFActS-C, whereas the original structures of the remaining seven PROMs were not confirmed in whiplash.

CONCLUSION

Until further research on the measurement properties of these PROMs is available, researchers may opt to use the PSEQ, PCS, or PFActS-C if the construct is aligned with research aims.

Recurrence of an Episode of Low Back Pain: An Inception Cohort Study in Emergency Departments

OBJECTIVES

To (1) determine the 1-year estimate of recurrence of low back pain (LBP) in a cohort of people presenting to emergency departments who have recently recovered from an episode of acute LBP in a middle-income country, (2) estimate a recurrence of LBP stratified by the STarT Back Screening Tool (SBST), and (3) determine prognostic factors for the recurrence of LBP.

DESIGN

Prospective inception cohort study.

METHODS

We included 238 patients who presented to emergency departments with recent-onset nonspecific LBP in São Paulo, Brazil. The outcome was the recurrence of an episode of LBP, assessed using 2 definitions: (1) 12-month recall alone and (2) pain measurements at follow-up. Prognostic factors were determined by logistic regression.

RESULTS

Within 1 year, the estimated recurrence of an episode of LBP ranged from 35% (79/225 events) (first definition) to 44% (100/226 events) (second definition). When patients were stratified by the SBST, the estimate of recurrence ranged from 29% to 37% (21-27/73 events) for low-risk patients, from 33% to 39% (24-28/72 events) for medium-risk patients, and from 43% to 56% (34-45/80 events) for high-risk patients. Age, perceived risk of persistent LBP, and disability were independent prognostic factors associated with LBP recurrence within 1 year.

CONCLUSION

After recovering from a previous episode of acute LBP, 4 in every 10 patients experienced a recurrence within 1 year. This estimate varied depending on the classification used in the SBST. Within 1 year, age, perceived risk of persistent LBP, and baseline disability were predictors of recurrence. J Orthop Sports Phys Ther 2022;52(7):484-492. Epub: 18 May 2022. doi:10.2519/jospt.2022.10775.

Physical functioning outcome measures in the lumbar spinal surgery population and measurement properties of the physical outcome measures: protocol for a systematic review

INTRODUCTION

Low back pain can lead to substantial decline in physical functioning. For disabling pain not responsive to conservative management, surgical intervention can enhance physical functioning. Measurements of physical functioning include patient-reported outcome measures and physical outcome measures using evaluations of impairments, performance on a standardised task or activity in a natural environment. Selecting outcome measures with adequate measurement properties is fundamental to evaluating effectiveness of interventions. The purpose of this systematic review is to identify outcome measures (patient reported and physical) used to evaluate physical functioning (stage 1) and assess the measurement properties of physical outcome measures of physical functioning (stage 2) in the lumbar spinal surgery population.

METHODS AND ANALYSIS

This protocol aligns with the COnsensus-based Standards for the selection of health Measurement INstruments (COSMIN) guidelines and Preferred Reporting Items for Systematic Review and Meta-Analysis Protocols. Using a two-staged approach, searches will be performed in MEDLINE, EMBASE, Health and Psychosocial Instruments, CINAHL, Web of Science, Scopus, PEDro and the grey literature from inception until 15 December 2021. Stage 1 will identify studies evaluating physical functioning with patient-reported or physical outcome measures in the lumbar spinal surgery population. Stage 2 will search for studies evaluating measurement properties (validity, reliability, responsiveness) of the physical outcome measures identified in stage 1 in the lumbar spinal surgery population. Two independent reviewers will evaluate studies for inclusion, extract data, assess risk of bias (COSMIN risk of bias tool and checklist) and quality of evidence (modified Grading of Recommendations Assessment, Development and Evaluation approach). Results for each measurement property per physical outcome measure will be quantitatively pooled if there is adequate clinical and methodological homogeneity or qualitatively synthesised if there is high heterogeneity in studies.

ETHICS AND DISSEMINATION

Ethics approval is not required. Results will be disseminated through peer-reviewed journal publication and conference presentation.

PROSPERO REGISTRATION NUMBER

CRD42021293880.

The 3-Month Effectiveness of a Stratified Blended Physiotherapy Intervention in Patients With Nonspecific Low Back Pain: Cluster Randomized Controlled Trial

Background

Patient education, home-based exercise therapy, and advice on returning to normal activities are established physiotherapeutic treatment options for patients with nonspecific low back pain (LBP). However, the effectiveness of physiotherapy interventions on health-related outcomes largely depends on patient self-management and adherence to exercise and physical activity recommendations. e-Exercise LBP is a recently developed stratified blended care intervention comprising a smartphone app integrated with face-to-face physiotherapy treatment. Following the promising effects of web-based applications on patients’ self-management skills and adherence to exercise and physical activity recommendations, it is hypothesized that e-Exercise LBP will improve patients’ physical functioning.

Objective

This study aims to investigate the short-term (3 months) effectiveness of stratified blended physiotherapy (e-Exercise LBP) on physical functioning in comparison with face-to-face physiotherapy in patients with nonspecific LBP.

Methods

The study design was a multicenter cluster randomized controlled trial with intention-to-treat analysis. Patients with nonspecific LBP aged ≥18 years were asked to participate in the study. The patients were treated with either stratified blended physiotherapy or face-to-face physiotherapy. Both interventions were conducted according to the Dutch physiotherapy guidelines for nonspecific LBP. Blended physiotherapy was stratified according to the patients’ risk of developing persistent LBP using the Keele STarT Back Screening Tool. The primary outcome was physical functioning (Oswestry Disability Index, range 0-100). Secondary outcomes included pain intensity, fear-avoidance beliefs, and self-reported adherence. Measurements were taken at baseline and at the 3-month follow-up.

Results

Both the stratified blended physiotherapy group (104/208, 50%) and the face-to-face physiotherapy group (104/208, 50%) had improved clinically relevant and statistically significant physical functioning; however, there was no statistically significant or clinically relevant between-group difference (mean difference −1.96, 95% CI −4.47 to 0.55). For the secondary outcomes, stratified blended physiotherapy showed statistically significant between-group differences in fear-avoidance beliefs and self-reported adherence. In patients with a high risk of developing persistent LBP (13/208, 6.3%), stratified blended physiotherapy showed statistically significant between-group differences in physical functioning (mean difference −16.39, 95% CI −27.98 to −4.79) and several secondary outcomes.

Conclusions

The stratified blended physiotherapy intervention e-Exercise LBP is not more effective than face-to-face physiotherapy in patients with nonspecific LBP in improving physical functioning in the short term. For both stratified blended physiotherapy and face-to-face physiotherapy, within-group improvements were clinically relevant. To be able to decide whether e-Exercise LBP should be implemented in daily physiotherapy practice, future research should focus on the long-term cost-effectiveness and determine which patients benefit most from stratified blended physiotherapy.

Trial Registration

ISRCTN Registry 94074203; https://doi.org/10.1186/ISRCTN94074203

International Registered Report Identifier (IRRID)

RR2-https://doi.org/10.1186/s12891-020-3174-z

Which Functional Outcomes Can be Measured in Low Back Pain Trials and Therapies?: A Prospective 2-Year Factor-, Cluster-, and Reliability-Multicenter Analysis on 42 Variables in 1049 Individuals

STUDY DESIGN

Prospective 2-year factor-, cluster-, and reliability-multicenter analysis.

OBJECTIVE

To provide evidence on the uniqueness and usefulness of a set of potential relevant functional outcomes.

SUMMARY OF BACKGROUND DATA

A very high number of functional outcomes that can be utilized as variables in low back pain (LBP) trials exists.

METHODS

Participants (n = 1049) with and without current LBP were included. At 7 visits (baseline, 4 wk, 3 mo, 6 mo, 9 mo, 1 yr, and 2 yr), 42 different functional outcomes were assessed. Two exploratory factor analyses (for baseline-values and for changes scores to 3 mo post-baseline) were calculated (maximum likelihood extraction, varimax factor rotation). The strongest factor-loading outcomes were selected for the following hierarchical cluster analyses (average linkage, Euclidean distance measure). For each cluster, time point, and outcome, reliability analyses were subsequently calculated using intraclass correlation coefficients, standard error of measurements and coefficients of variation.

RESULTS

The factor analysis for the cross-sectional values revealed 9 factors with a cumulative variance explanation of 61.7% and 13 unique ones. The change-score factor analysis revealed nine factors with a total variance explanation of 61.8%, seven outcomes were unique. Ten outcomes were important for both cross-sectional and change-score analyses, 11 were most valuable for cross-sectional and four for the change scores. Patients with pain grades 1 to 3 show comparable patterns (cluster 2). Grade 0 (cluster 1) and grade 4 (cluster 3) are unique and cannot be cumulated with other grades. Most biomechanical outcomes were highly reliable and display low measurement errors.

CONCLUSION

We found 25 potentially meaningful functional outcomes in the context of objective functional measurements (such as trunk range of motion, dynamic and static balance, strength, and muscle fatigue resistance) and body characteristics. The present framework may help to select appropriate functional outcomes and rate effects beyond the known core set of outcomes.Level of Evidence: 1.

The Visual Analogue Scale Versus Numerical Rating Scale in Measuring Pain Severity and Predicting Disability in Low Back Pain

BACKGROUND

Low back pain (LBP) is a public health problem that requires accurate assessment for proper management and predicting prognosis.

OBJECTIVE

This study aims to assess the agreement between visual analogue scale (VAS) and numeric rating scale (NRS) in measuring LBP severity, and investigate their ability in predicting disability.

METHODS

A cross-sectional study was performed on 100 patients with chronic LBP. Pain severity assessment was performed using VAS, NRS, and pain severity scores of the Brief Pain Inventory (BPI). Disability assessment was done by BPI-Pain interference and Modified Oswestry Disability Index (MODI).

RESULTS

There was a significant positive correlation between VAS and NRS (r = 0.92, p < 0.001) with high agreement between both as detected by Bland-Altman method (mean difference = 0.33). Moreover, there was significant (p < 0.001) positive correlation between disability scores and either VAS (r = 0.92 with BPI pain interference; r = 0.75 with MODI) or NRS (r = 0.95 with BPI pain interference; r = 0.68 with MODI). By using receiver operating characteristic curve, a score of 6 in VAS or NRS can predict severe disability, whereas VAS score higher than 4 and NRS score higher than 3 can predict moderate disability.

CONCLUSIONS

Visual analogue scale and NRS appeared reliable in assessing LBP severity with no significant difference between them. Moreover, either VAS or NRS scores can predict disability of patients with LBP.

Use of the PROMIS-10 global health in patients with chronic low back pain in outpatient physical therapy: a retrospective cohort study

Background

Although evidence-based guidelines for physical therapy for patients with chronic low back pain (cLBP) are available, selecting patient-reported outcome measures to capture complexity of health status and quality of life remains a challenge. PROMIS-10 Global Health (GH) may be used to screen for impactful health risks and enable patient-centered care. The purpose of this study was to investigate the interrelationships between PROMIS-10 GH scores and patient demographics, health status, and healthcare utilization in patients with cLBP who received physical therapy.

Methods

A retrospective review of de-identified electronic health records of patients with cLBP was performed. Data were collected for 328 patients seen from 2017 to 2020 in three physical therapy clinics. Patients were grouped into HIGH and LOW initial assessment scores on the PROMIS-10 Global Physical Health (PH) and Global Mental Health (MH) measures. Outcomes of interest were patient demographics, health status, and healthcare utilization. Mann–Whitney U and chi-square tests were used to determine differences between groups, and binary logistic regression was used to calculate odds ratios (OR) to determine predictors of PH-LOW and MH-LOW group assignments.

Results

The PH-LOW and MH-LOW groups contained larger proportions of patients who were African American, non-Hispanic, and non-commercially insured compared to PH-HIGH and MH-HIGH groups (p < .05). The PH-LOW and MH-LOW groups also had a higher Charlson comorbidity index (CCI), higher rates of diabetes and depression, and more appointment cancellations or no-shows (p < .05). African American race (OR 2.54), other race (2.01), having Medi-Cal insurance (OR 3.37), and higher CCI scores (OR 1.55) increased the likelihood of being in the PH-LOW group. African American race (OR 3.54), having Medi-Cal insurance (OR 2.19), depression (OR 3.15), kidney disease (OR 2.66), and chronic obstructive pulmonary disease (OR 1.92) all increased the likeihood of being in the MH-LOW group.

Conclusions

Our study identified groups of patients with cLBP who are more likely to have lower PH and MH scores. PROMIS-10 GH provides an opportunity to capture and identify quality of life and global health risks in patients with cLBP. Using PROMIS-10 in physical therapy practice could help identify psychosocial factors and quality of life in the population with cLBP.

Are the Roland Morris Disability Questionnaire and Oswestry Disability Index interchangeable in patients after lumbar spinal fusion?

BACKGROUND

Low back pain is a common health problem for which there are several treatment options. For optimizing clinical decision making, evaluation of treatments and research purposes it is important that health care professionals are able to evaluate the functional status of patients. Patient reported outcome measures (PROMs) are widely accepted and recommended. The Roland Morris Disability Questionnaire (RMDQ) and the Oswestry Disability Index (ODI) are the two mainly used condition-specific patient reported outcomes. Concerns regarding the content and structural validity and also the different scoring systems of these outcome measures makes comparison of treatment results difficult.

OBJECTIVE

Aim of this study was to determine if the RMDQ and ODI could be used exchangeable by assessing the correlation and comparing different measurement properties between the questionnaires.

METHODS

Clinical data from patients who participated in a multicenter RCT with 2 year follow-up after lumbar spinal fusion were used. Outcome measures were the RMDQ, ODI, Short Form 36 - Health Survey (SF-36), leg pain and back pain measured on a 0-100 mm visual analogue scale (VAS). Cronbach's alpha coefficients, Spearman correlation coefficients, multiple regression analysis and Bland-Altman plots were calculated.

RESULTS

three hundred and seventy-six completed questionnaires filled out by 87 patients were used. The ODI and RMDQ had both a good level of internal consistency. There was a very strong correlation between the RMDQ and the ODI (r= 0.87; p< 0.001), and between the VAS and both the ODI and RMDQ. However, the Bland-Altman plot indicated bad agreement between the ODI and RMDQ.

CONCLUSIONS

The RMDQ and ODI cannot be used interchangeably, nor is there a possibility of converting the score from one questionnaire to the other. However, leg pain and back pain seemed to be predictors for both the ODI and the RMDQ.

Measurement Properties of the Brief Pain Inventory-Short Form (BPI-SF) and Revised Short McGill Pain Questionnaire Version-2 (SF-MPQ-2) in Pain-related Musculoskeletal Conditions: A Systematic Review

OBJECTIVE

The objective of this study was to systematically locate, critically appraise, and summarize clinical measurement research addressing the use of Brief Pain Inventory-Short Form (BPI-SF) and Revised Short McGill Pain Questionnaire Version-2 (SF-MPQ-2) in pain-related musculoskeletal (MSK) conditions.

MATERIALS AND METHODS

We systematically searched 4 databases (Medline, CINAHL, EMBASE, and SCOPUS) and screened articles to identify those reporting the psychometric properties (eg, validity, reliability) and interpretability (eg, minimal clinically important difference) of BPI-SF and SF-MPQ-2 as evaluated in pain-related MSK conditions. Independently, 2 reviewers extracted data and assessed the quality of evidence with a structured quality appraisal tool and the updated COSMIN guidelines.

RESULTS

In all, 26 articles were included (BPI-SF, n=17; SF-MPQ-2, n=9). Both tools lack reporting on their cross-cultural validities and measurement error indices (eg, standard error of measurement). High-quality studies suggest the tools are internally consistent (α=0.83 to 0.96), and they associate modestly with similar outcomes (r=0.3 to 0.69). Strong evidence suggests the BPI-SF conforms to its 2-dimensional structure in MSK studies; the SF-MPQ-2 4-factor structure was not clearly established. Seven reports of high-to-moderate quality evidence were supportive of the BPI-SF known-group validity (n=2) and responsiveness (n=5). One report of high quality established the SF-MPQ-2 responsiveness.

DISCUSSION

Evidence of high-to-moderate quality supports the internal consistency, criterion-convergent validity, structural validity, and responsiveness of the BPI-SF and SF-MPQ-2 and establishes their use as generic multidimensional pain outcomes in MSK populations. However, more studies of high quality are still needed on their retest reliability, known-group validity, cross-cultural validity, interpretability properties, and measurement error indices in different MSK populations.

What does it take to facilitate the integration of clinical practice guidelines for the management of low back pain into practice? Part 1: A synthesis of recommendation

BACKGROUND

Despite the emergence of multiple clinical practice guidelines (CPGs) for the rehabilitation of low back pain (LBP) over the last decade, self-reported levels of disability in this population have not improved. This may be explained by the numerous implementation barriers, such as the complexity of information and sheer volumes of CPGs.

OBJECTIVES

The purpose of this study was to summarize the evidence and recommendations from the most recent and high-quality CPGs on the rehabilitation management of LBP by developing an infographic summarizing the recommendations to facilitate dissemination into clinical practice.

METHODS

We performed a systematic review of high-quality CPGs with an emphasis on rehabilitation approaches. We searched major health-related research databases (e.g., PubMed, CINAHL, and PEDro). We performed quality assessment via the AGREE-II instrument. Contents of the CPGs were synthesized by extracting recommendations, which were then compared to one another to identify consistencies based on an iterative evaluation process.

RESULTS

We identified and assessed 5 recent high-quality CPGs. We synthesized 13 recommendations on the rehabilitation management of LBP (2 for screening procedures, 3 for assessment procedures, and 8 involving treatment approaches) and 2 underlying principles were highlighted. These results were then synthetized and illustrated in a concise infographic that serves as a conceptual roadmap that identifies the specific behavior changes (i.e., adoption of CPGs' recommendations) rehabilitation professionals should adopt in order to integrate an evidenced-based approach for the management of LBP.

CONCLUSIONS

We systematically reviewed the literature for CPGs' recommendations for the physical rehabilitation management of LBP and synthesized the information through an infographic.

Comprehensiveness and validity of a multidimensional assessment in patients with chronic low back pain: a prospective cohort study

Background

Chronic low back pain is a multidimensional syndrome affecting physical activity and function, health-related quality of life and employment status. The aim of the study was to quantify the cross-sectional and longitudinal validity of single measurement scales in specific construct domains and to examine how they combine to build a comprehensive outcome, covering the complex construct of chronic low back pain before and after a standardized interdisciplinary pain program.

Methods

This prospective cohort study assessed 177 patients using the Short Form 36 (SF-36), the Multidimensional Pain Inventory (MPI), the Symptom Checklist-90-Revised (SCL-90-R), the Oswestry Disability Index (ODI), and 2 functional performance tests, the Back Performance Scale (BPS) and the 6-Minute Walking Distance (6MWD). The comprehensiveness and overlap of the constructs used were quantified cross-sectionally and longitudinally by bivariate correlations, exploratory factor analysis, and effect sizes.

Results

The mean age of the participants was 48.0 years (+/− 12.7); 59.3% were female. Correlations of baseline scores ranged from r = − 0.01 (BPS with MPI Life control) to r = 0.76 (SF-36 Mental health with MPI Negative mood). SF-36 Physical functioning correlated highest with the functional performance tests (r = 0.58 BPS, 0.67 6MWD) and ODI (0.56). Correlations of change scores (difference of follow-up – baseline score) were consistent but weaker. Factor analysis revealed 2 factors: “psychosocial” and “pain & function” (totally explained variance 44.0–60.9%). Psychosocial factors loaded strongest (up to 0.89 SCL-90-R) on the first factor, covering 2/3 of the explained variance. Pain and function (ing) loaded more strongly on the second factor (up to 0.81 SF-36 Physical functioning at follow-up). All scales showed improvements, with effect sizes ranging from 0.16–0.67.

Conclusions

Our results confirm previous findings that the chronic low back pain syndrome is highly multifactorial and comprises many more dimensions of health and quality of life than merely back-related functioning. A comprehensive outcome measurement should include the predominant psychosocial domain and a broad spectrum of measurement constructs in order to assess the full complexity of the chronic low back syndrome. Convergence and divergence of the scales capture the overlapping contents and nuances within the constructs.

Construct validity of the Quebec Back Pain Disability Scale: a factor analytic and Rasch study

BACKGROUND

Studies on structural validity of the Quebec Back Pain Disability Scale (QBPDS) showed uncertain unidimensionality.

AIM

To investigate dimensionality and internal construct validity of the QBPDS, using advanced psychometric methods.

DESIGN

Secondary analysis of data from a cross-sectional observational study, SETTING: Outpatient rehabilitation hospital.

POPULATION

201 patients with chronic Low Back Pain (40% men; mean age 48±12 years).

METHODS

Confirmatory (CFA) and then Exploratory Factor Analysis (EFA), and Rasch analysis were used.

RESULTS

CFA could not provide a satisfactory one-factor solution. Thus, according to a preliminary parallel analysis, two factor structures were examined: i) a single-factor solution, that showed good model fit according to Goodness of Fit Index and Comparative Fit Index, acceptable fit according to Root Mean Square Error of Approximation, and poor fit according to Standardized Root Mean Square of Residuals; ii) a bi-factor solution, both showing a good fit in all 4 indices. The Explained Common Variance index was 0.87. Thus, it was considered appropriate to apply Rasch analysis to our QBPDS data. Four items underfit the Rasch model and showed (two by two) local dependency. Removing these 4 misfitting items resulted in an acceptable fit to the Rasch model of the 16 remaining items.

CONCLUSIONS

All results pointed towards an essential unidimensionality of the QBPDS. Thus, we suggest to provisionally use the full QBPDS and its global score, pending further research on scale's construct validity. If the suboptimal performance of 4 items would be confirmed, the deletion of some of them could improve the metric quality of the scale.

CLINICAL REHABILITATION IMPACT

This study fills an evidence gap on important measurement properties of the QBPDS (namely, dimensionality and internal construct validity), thus representing a useful step towards the definition of the more suitable outcome measures for research and clinical practice in nonspecific chronic LBP.

Optimizing management of low back pain through the pain and disability drivers management model: A feasibility trial

INTRODUCTION

Self-reported levels of disability in individuals with low back pain (LBP) have not improved in the last decade. A broader perspective and a more comprehensive management framework may improve disability outcomes. We recently developed and validated the Low Back Pain and Disability Drivers Management (PDDM) model, which aims to identify the domains driving pain and disability to guide clinical decisions. The objectives of this study were to determine the applicability of the PDDM model to a LBP population and the feasibility of conducting a pragmatic trial, as well as to explore clinicians' perceived acceptability of the PDDM model's use in clinical settings.

METHODS

This study was an one-arm prospective feasibility trial. Participants included physiotherapists working with a population suffering from LBP and their patients aged 18 years or older presenting with a primary complaint of LBP that sought a new referral and deemed fit for rehabilitation from private and public clinical settings. Clinicians participated in a one-day workshop on the integration of the PDDM model into their clinical practice, and were asked to report various LBP-related outcomes via self-reported questionnaires (i.e., impact of pain on physical function, nervous system dysfunctions, cognitive-emotional factors, work disabilities) at baseline and at six-week follow-up. Physiotherapists' acceptability of the use of the PDDM model and appreciation of the training were assessed via semi-structured phone interviews. Analyses focused on a description of the model's applicability to a LBP population, feasibility outcomes and acceptability measures.

RESULTS

Applicablity of the PDDM model was confirmed since it successfully established the profile of patients according to the elements of each categories, and each of the 5 domains of the model was represented among the study sample. Trial was deemed feasible contingent upon few modifications as our predefined success criteria for the feasibility outcomes were met but feasibility issues pertaining to data collection were highlighted. Twenty-four (24) clinicians and 61 patients were recruited within the study's timeframe. Patient's attrition rate (29%) and clinicians' compliance to the study protocol were adequate. Clinicians' perceived acceptability of the use of the model in clinical settings and their appreciation of the training and online resources were both positive. Recommendations to improve the model's integration in clinical practice, content of the workshop and feasibility of data collection methods were identified for future studies. A positive effect for all patients' reported outcome measures were also observed. All outcome measures except for the PainDetect questionnaire showed a statistically significant reduction post-intervention (p<0.05).

CONCLUSION

These findings provide preliminary evidence of the potential of the PDDM model to optimize LBP management as well as conducting a future larger-scale pragmatic trial to determine its effectiveness.

TRIAL REGISTRATION

Clinicaltrial.gov: NCT03949179.

Responsiveness of the PROMIS-29 Scales in Individuals With Chronic Low Back Pain

STUDY DESIGN

Prospective cohort study.

OBJECTIVE

To evaluate responsiveness and estimate the minimal clinically important differences (MCIDs) for the Patient-Reported Outcomes Measurement Information System-29 (PROMIS-29) scales in individuals with chronic low back pain.

SUMMARY OF BACKGROUND DATA

The PROMIS-29 questionnaire assesses seven health-related quality-of-life domains. However, research to evaluate the responsiveness and MCIDs of the PROMS-29 scores in individuals with low back pain is limited.

METHODS

The study was conducted in physical therapy clinics in Thailand, using validated Thai versions of the study measures. One hundred and eighty-three individuals with chronic low back pain completed the PROMIS-29 at baseline and at 4-weeks follow-up. Perceived change in each domain assessed by the PROMIS-29 scales was assessed at 4 weeks using a 7-point measure of Global Perceived Effect (GPE). Responsiveness of the PROMIS-29 scale scores was evaluated by examining the effect sizes, the standardized response means (SRMs) for change over time, and examining these as a function of the GPE ratings. MCIDs for the scales were estimated by computing a half a standard deviation (SD) and standard error of measurement statistic for each scale.

RESULTS

The mean change scores, effect sizes, and SRMs increased as a function of the GPE ratings. Significant differences in change scores between those who reported that they were very much improved and those who did not improve were found for the PROMIS-29 Pain Intensity, Physical Function, and Anxiety scales. The correlations between changes scores and GPE ratings were mostly weak in magnitude. The MCID estimates computed as 0.50 of a SD unit and as a standard error of measurement showed similar values.

CONCLUSION

The PROMIS-29 scale scores assessing pain intensity, physical function, and anxiety evidenced the most responsivity in the study sample. The results, when considered in light of the findings from other investigators, support 5.0 points as a reasonable MCID for most of the PROMIS-29 scales. Further studies are needed to determine the generalizability of the findings.Level of Evidence: 2.

Minimum important change values for pain and disability: which is the best to identify a meaningful response in patients with chronic nonspecific low back pain?

PURPOSE

To examine the association between different minimum important change (MIC) values for pain and disability and a successful response in global perception of improvement in patients with chronic nonspecific low back pain (CNLBP).

METHODS

A prospective cohort study was conducted. At baseline, all participants completed a sociodemographic and clinical questionnaire, the Numeric Pain Rating Scale and the Quebec Back Pain Disability Scale (QBPDS). After a physiotherapy program, the Global Perceived Effect Scale (GPES) was completed together with pain and disability measures. The association of the different literature MIC values for pain and disability with a successful response on the GPES was analyzed using logistic regression models. The discrimination power, sensitivity, specificity and predictive values were computed.

RESULTS

A total of 183 patients with CNLBP participated in this study. A reduction of 30% on the QBPDS (OR = 7.8; area under the curve = 0.73; sensitivity = 0.72; specificity = 0.76) most accurately identified patients who perceived a global improvement on the GPES. Composite criteria using both pain and disability MIC values presented high odds ratios and specificity values, but failed to identify patients who perceived a meaningful improvement.

CONCLUSION

A 30% reduction on the QBPDS is recommended to identify patients with CNLBP who achieve a clinical improvement with physiotherapy treatment.

Measuring exercise adherence in patients with low back pain: development, validity, and reliability of the EXercise Adherence Scale (EXAS)

OBJECTIVES

To develop an instrument to measure adherence to frequency, intensity, and quality of performance of home-based exercise (HBE) programs recommended by a physical therapist and to evaluate its construct validity and reliability in patients with low back pain.

METHODS

The Exercise Adherence Scale (EXAS) was developed following a literature search, an expert panel review, and a pilot test. The construct validity of the EXAS was determined based on data from 27 participants through an investigation of the convergent validity between adherence, lack of time to exercise, and lack of motivation to exercise. Associations between adherence, pain, and disability were determined to test divergent validity. The reliability of the EXAS quality of performance score was assessed using video recordings from 50 participants performing four exercises.

RESULTS

Correlations between the EXAS and lack of time to exercise, lack of motivation to exercise, pain, and disability were rho = 0.47, rho = 0.48, rho = 0.005, and rho = 0.24, respectively. The intrarater reliability of the quality of performance score was Kappa quadratic weights (K_qw) = 0.87 (95%-CI 0.83-0.92). The interrater reliability was K_qw = 0.36 (95%-CI 0.27-0.45).

CONCLUSIONS

The EXAS demonstrates acceptable construct validity for the measurement of adherence to HBE programs. Additionally, the EXAS shows excellent intrarater reliability and poor interrater reliability for the quality of performance score and is the first instrument to measure adherence to frequency, intensity, and quality of performance of HBE programs. The EXAS allows researchers and clinicians to better investigate the effects of adherence to HBE programs on the outcomes of interventions and treatments.

Core Outcome Measures for Chronic Musculoskeletal Pain Research: Recommendations from a Veterans Health Administration Work Group

OBJECTIVE

Chronic musculoskeletal pain (CMSP) disorders are among the most prevalent and disabling conditions worldwide. It would be advantageous to have common outcome measures when comparing results across different CMSP research studies.

METHODS

The Veterans Health Administration appointed a work group to recommend core outcome measures for assessing pain intensity and interference as well as important secondary domains in clinical research. The work group used three streams of data to inform their recommendations: 1) literature synthesis augmented by three recently completed trials; 2) review and comparison of measures recommended by other expert groups; 3) two Delphi surveys of work group members.

RESULTS

The single-item numerical rating scale and seven-item Brief Pain Inventory interference scale emerged as the recommended measures for assessing pain intensity and interference, respectively. The secondary domains ranked most important included physical functioning and depression, followed by sleep, anxiety, and patient-reported global impression of change (PGIC). For these domains, the work group recommended the Patient-Reported Outcome Information System four-item physical function and sleep scales, the Patient Health Questionnaire two-item depression scale, the Generalized Anxiety Disorder two-item anxiety scale, and the single-item PGIC. Finally, a single-item National Health Interview Survey item was favored for defining chronic pain.

CONCLUSIONS

Two scales comprising eight items are recommended as core outcome measures for pain intensity and interference in all studies of chronic musculoskeletal pain, and brief scales comprising 13 additional items can be added when possible to assess important secondary domains.

Using PROMIS-29 to predict Neck Disability Index (NDI) scores using a national sample of cervical spine surgery patients

BACKGROUND CONTEXT

Patient reported outcome measures (PROMs) are valuable tools for evaluating the success of spine surgery, with the Neck Disability Index (NDI) commonly used to assess pain-related disability. Recently, patient-reported outcomes measurement information system (PROMIS) has gained attention in its ability to measure PROs across general patient populations. However, PROMIS is not condition-specific so spine researchers are reluctant to incorporate it in place of common legacy measures.

PURPOSE

To compare the PROMIS-29 (v2.0) to the NDI and compute a conversion equation.

STUDY DESIGN

This study retrospectively analyzes prospectively collected data from the cervical module of national spine registry, the Quality Outcomes Database (QOD).

PATIENT SAMPLE

The QOD was queried for cervical spine surgery patients with PROMIS-29 and NDI scores. The cervical module of QOD includes patients undergoing primary or revision surgery for cervical degenerative spine diseases. Exclusion criteria included age under 18 years and diagnoses of infection, tumor, or trauma as the cause of cervical-related pain.

OUTCOME MEASURES

The outcome of interest for this study was a conversion equation from PROMIS-29 to NDI.

METHODS

The PROMIS-29 includes seven 4-item domains each rated on a 5-point scale: Physical function, depression, anxiety, fatigue, sleep disturbance, ability to participate in social roles and activities (social roles), and pain interference plus one stand-alone pain intensity item. The NDI contains 10 pain-related questions scored from 0 (no pain) to 5 (most severe pain). Outcomes were collected prior to surgery and at 3- and 12-month post surgery. Patients were included in the current analysis if they had outcome data available at one or more time points. Multivariable mixed effects regression models predicting NDI scores from PROMIS-29 domains were conducted in a development data set and validated in a separate data set. Predicted NDI scores were plotted against NDI scores to determine how well PROMIS-29 domains predicted NDI. Conversion equations were created from the PROMIS-29 regression coefficients.

RESULTS

2,018 patients from 18 US hospitals were included (mean age=57 years (SD=12)) with 48% female, 87% Caucasian, and 11% had revision surgery. Strong correlations were found between NDI and pain interference (r=0.79), pain intensity (r=0.74), social roles (r=-0.71), physical function (r=-0.69), sleep disturbance (r=0.63), fatigue (r=0.63), and anxiety (r=0.54). Correlation between NDI and depression (r=0.49) was slightly weaker. The pattern of correlations was consistent across timepoints. Four conversion equations were created for NDI using (1) only pain interference, (2) only physical function, (3) pain interference and physical function, and (4) the five statistically significant domains of pain interference, physical function, social roles, sleep disturbance, and anxiety, plus the pain intensity item. Equations 1, 3, and 4 were the best predictors of NDI, predicting approximately 80% of NDI scores within 15 points in the validation data set. Equation 4 (NDI_%=18.897+0.855*[pain interference_raw]-0.694*[physical function_raw]+2.010*[pain intensity_raw]-0.663*[social roles_raw]+0.732*[sleep disturbance_raw]+0.426*[anxiety_raw]) predicted NDI most accurately with an R² between the predicted and actual NDI scores of 0.72. Model 1 (R² = 0.62; NDI_%=-4.055+3.164*[pain interference_raw])) and Model 3 (R²=0.65; NDI%=17.321+2.543*[pain interference_raw]-1.012*[physical function_raw]) also had good accuracy.

CONCLUSIONS

Findings suggest accurate NDI scores can be derived from PROMIS-29 domains. Clinicians who want to move from NDI to PROMIS-29 can use this equation to obtain estimated NDI scores when only collecting PROMIS-29. These results support the use of PROMIS-29 in cervical surgery populations and underscore the idea that PROMIS-29 domains have the potential to replace disease-specific traditional PROMs.

Do the commonly used standard questionnaires measure what is of concern to patients with low back pain?

Objective:

Evaluate whether questionnaires identified all the self-reported patient outcomes raised in focus groups.

Design:

Mixed methods research combined with qualitative analysis of focus groups.

Settings:

Physical therapy clinic in a teaching hospital in Brazil.

Subjects:

A total of 27 patients (aged >18 years, mean age 55.2 years) with chronic non-specific low back pain.

Interventions:

Three focus groups were conducted by the same investigator and analyzed by meaning unit condensation. The results obtained from the focus groups were codified according to the International Classification of Functioning. A similar process was adopted to codify the Roland-Morris Disability Questionnaire, the Quebec Back Pain Disability Scale and the Oswestry Disability Index according to the International Classification of Functioning. The results of both coding processes were compared.

Results:

In the analysis, seven main concepts were identified, comprising 77 meaning units. Only three meaning units were not linked to the International Classification of Functioning. Most of the codes present in the questionnaires and focus groups represent limitations to activities. Some codes were identified in the questionnaires that were not mentioned by the focus group participants. No questionnaire assessed environmental factors or problems related to specific parts of the body, and very few assessed body function, all of which were issues raised in the focus groups.

Conclusion:

This study shows that not all fields considered important by patients to their function are being evaluated, and emotional and contextual factors should be included in clinical assessments in order to fully understand patient need.

What Is the Personal Impact of Recurrences of Low Back Pain? Subanalysis of an Inception Cohort Study

OBJECTIVE

To investigate (1) the impact of low back pain (LBP) over the course of 1 year in people recently recovered from an episode of LBP, (2) whether the impact differs in people who do and do not experience a recurrence, and (3) the impact of LBP based on 3 definitions of a recurrence of LBP.

DESIGN

Cohort study.

METHODS

In 250 individuals recently recovered from LBP, the impact of LBP over the previous 3 months was assessed with the impact score, a multidimensional measure (range, 8-50), at 3, 6, 9, and 12 months. Recurrence of LBP was assessed monthly and defined as a recurrence of an episode of LBP, a recurrence of activity-limiting LBP, or a recurrence of LBP causing patients to seek care.

RESULTS

The median impact over 1 year was 11.5 points (interquartile range, 9.5-14.8). The impact was 15.2 points (95% confidence interval [CI]: 13.9, 16.3) for those who reported any recurrence and 11.1 points (95% CI: 10.6, 11.5) for those who did not. When comparing definitions of recurrence, those who had a recurrence that did not cause moderate activity limitation or result in care seeking had an overall impact of 12.7 points (95% CI: 11.6, 13.8). Participants who had recurrences of activity-limiting LBP but did not seek care, had an overall impact of 15.5 points (95% CI: 13.5, 17.6), and those who had recurrences of LBP for which health care was sought had an overall impact of 16.9 points (95% CI: 15.3, 18.4).

CONCLUSION

The average impact due to recurrence of LBP was low and dependent on the definition of recurrence. J Orthop Sports Phys Ther 2020;50(6):294-300. Epub 16 Apr 2020. doi:10.2519/jospt.2020.9345.

Effectiveness and cost-effectiveness of stratified blended physiotherapy in patients with non-specific low back pain: study protocol of a cluster randomized controlled trial

BACKGROUND

Patient education, advice on returning to normal activities and (home-based) exercise therapy are established treatment options for patients with non-specific low back pain (LBP). However, the effectiveness of physiotherapy interventions on physical functioning and prevention of recurrent events largely depends on patient self-management, adherence to prescribed (home-based) exercises and recommended physical activity behaviour. Therefore we have developed e-Exercise LBP, a blended intervention in which a smartphone application is integrated within face-to-face care. E-Exercise LBP aims to improve patient self-management skills and adherence to exercise and physical activity recommendations and consequently improve the effectiveness of physiotherapy on patients' physical functioning. The aim of this study is to investigate the short- (3 months) and long-term (12 and 24 months) effectiveness on physical functioning and cost-effectiveness of e-Exercise LBP in comparison to usual primary care physiotherapy in patients with LBP.

METHODS

This paper presents the protocol of a prospective, multicentre cluster randomized controlled trial. In total 208 patients with LBP pain were treated with either e-Exercise LBP or usual care physiotherapy. E-Exercise LBP is stratified based on the risk for developing persistent LBP. Physiotherapists are able to monitor and evaluate treatment progress between face-to-face sessions using patient input from the smartphone application in order to optimize physiotherapy care. The smartphone application contains video-supported self-management information, video-supported exercises and a goal-oriented physical activity module. The primary outcome is physical functioning at 12-months follow-up. Secondary outcomes include pain intensity, physical activity, adherence to prescribed (home-based) exercises and recommended physical activity behaviour, self-efficacy, patient activation and health-related quality of life. All measurements will be performed at baseline, 3, 12 and 24 months after inclusion. An economic evaluation will be performed from the societal and the healthcare perspective and will assess cost-effectiveness of e-Exercise LBP compared to usual physiotherapy at 12 and 24 months.

DISCUSSION

A multi-phase development and implementation process using the Center for eHealth Research Roadmap for the participatory development of eHealth was used for development and evaluation. The findings will provide evidence on the effectiveness of blended care for patients with LBP and help to enhance future implementation of blended physiotherapy.

TRIAL REGISTRATION

ISRCTN, ISRCTN94074203. Registered 20 July 2018 - Retrospectively registered.

Task-Specific Sensitivity in Physical Function Testing Predicts Outcome in Patients With Low Back Pain

OBJECTIVE

To investigate the prognostic value of task-specific sensitivity in patients with low back pain by exploring whether task-specific sensitivity during physical function testing was associated with self-reported change in pain and disability.

DESIGN

Prospective cohort study nested in a randomized controlled trial.

METHODS

The study included 260 patients with low back pain, referred for evaluation in a secondary care setting. All patients completed questionnaires and underwent clinical examination by a physical therapist. Patients rated their pain intensity before and after completing a test battery measuring physical function and were classified into 4 categories-worse, unchanged, better, or no pain-depending on their pain response. At 3-month follow-up, outcomes were obtained by a postal questionnaire.

RESULTS

Task-specific sensitivity significantly predicted pain, after adjusting for known prognostic factors. Patients in the no pain, better, and unchanged groups improved their pain score significantly more than patients in the worse pain group. Patients in the no pain group also improved their disability score significantly more compared to patients in the worse pain group, after adjusting for known prognostic factors.

CONCLUSION

Task-specific sensitivity predicted pain intensity after 3 months in patients with low back pain. The prognostic value appears limited with respect to disability. J Orthop Sports Phys Ther 2020;50(4):206-213. Epub 30 Oct 2019. doi:10.2519/jospt.2020.8953.

A novel method in assessing lower limb motor function

PURPOSE

To propose a novel, accurate, and easy to perform test replacing the manual muscle testing. Our target is to develop a valuable tool for identification of patients with neurological motor impairment precisely, rapidly, and easily.

METHODS

We have randomly selected patients presenting to the clinic complaining of back pain with or without lower limb symptoms. These patients were asked to walk on their heels and on their toes. Being unable to walk on heels and/or toes, the patient is considered to have positive test result (abnormal finding). After that, a full and thorough neurological examination was performed on every patient by an orthopedic resident doctor. We looked specifically to the correlation between the ability to do toe-heel walking with the results of the detailed neurological examination.

RESULTS

Toe-heel walking test was able to detect all patients with weakness in their lower limb musculature. The results from the current investigation indicate a very high Pearson correlation of 0.95 ( p = 0.001) between the toe-heel test and manual muscle testing.

CONCLUSION

Toe-heel walking test is superior to detailed neurological examination in identification of patients with weakness, sphincter problem, and/or positive straight leg raising test. This test is both simple and rapidly performed test, which can be easily done by any health-care provider. Owing to its ease, this test is not restricted to medical doctors, but it could be accurately performed by any health-care provider such as nurses and physiotherapists. This will enable us to decrease the referral to the specialty clinic and to decrease the overall cost.

Core patient-reported outcome domains for routine clinical care in chronic pain management: patients' and healthcare professionals' perspective

PURPOSE

To identify a core patient-reported outcome (PRO) domain set to be used in routine clinical care in settings offering specialized and supra-specialized multidisciplinary care to individuals with chronic pain (CP).

METHODS

Two online cross-sectional surveys were administered: one with healthcare professionals (HCPs) and one with individuals with CP. Both surveys included domains of health-related quality of life (HRQoL) from the Patient-Reported Outcomes Measurement Information System (PROMIS) framework. The patients' survey also included the Patient Generated Index (PGI). Areas affected by CP identified in the PGI were mapped to The International Classification of Functioning, Disability and Health (ICF).

RESULTS

According to HCPs, the five most relevant HRQoL domains to be assessed in routine clinical care were pain interference, pain intensity, physical function, anxiety and depression. The five areas that were the most valued by individuals with CP were recreation and leisure; global mental function; work and employment; household tasks and walking and moving. In total, these represented 74% of all nominated areas. When triangulating both frameworks (ICF/PROMIS) and perspectives (HCPs/patients), 10 core PRO domains were identified: pain interference, pain intensity, physical function, sleep disturbance, anxiety, depression, ability to participate in social roles and activities, fatigue, sleep-related impairments and self-efficacy.

CONCLUSIONS

This study identified 10 core PRO domains covering the physical, psychological and social consequences of CP on an individual's life from the perspective of individuals with CP and HCPs. The results can help identify appropriate PRO measures to assess the outcomes of multidisciplinary interventions.

Baseline Characteristics May Help Indicate the Best Choice of Health Care Provider for Back Pain Patients in Primary Care: Results From a Prospective Cohort Study

OBJECTIVE

Baseline characteristics of patients low back pain differ substantially between care settings, but it is largely unknown whether predictors are of equal importance across settings. The aim of this study was to investigate whether 8 known predictors relate differently to outcomes in chiropractic practice and in general practice and to which degree these factors may be helpful in selecting patients benefiting more from one setting or the other.

METHODS

Patient characteristics were collected at baseline, and outcomes of pain intensity (numeric rating scale 0-10) and activity limitation (Roland-Morris Disability Questionnaire 0-100) after 2, 12, and 52 weeks. Differences in the prognostic strength between settings were investigated for each prognostic factor separately by estimating the interaction between setting and the prognostic factor using regression models. Between-setting differences in outcome in high-risk and low-risk subgroups, formed by single prognostic factors, were assessed in similar models adjusted for a propensity score to take baseline differences between settings into account.

RESULTS

Prognostic factors were generally associated more strongly with outcomes in general practice compared with chiropractic practice. The difference was statistically significant for general health, duration of pain, and musculoskeletal comorbidity. After propensity score adjustment, differences in outcomes between settings were insignificant, but negative prognostic factors tended to be less influential in chiropractic practice except for leg pain and depression, which tended to have less negative impact in general practice.

CONCLUSION

Known prognostic factors related differently to outcomes in the 2 settings, suggesting that some subgroups of patients might benefit more from one setting than the other.

Validation of PROMIS CATs and PROMIS Global Health in an Interdisciplinary Pain Program for Patients With Chronic Low Back Pain

STUDY DESIGN

Retrospective cohort study.

OBJECTIVE

To (1) confirm validity of Patient-Reported Outcomes Measurement Information System (PROMIS) physical function and pain interference computer-adaptive tests (CATs) and (2) assess the validity of PROMIS Global Health (GH) and five additional PROMIS CATs: social role satisfaction, fatigue, anxiety, depression, and sleep disturbance in a population of patients with chronic low back pain (cLBP) who completed a 3-month Interdisciplinary Pain Program (IPP).

SUMMARY OF BACKGROUND DATA

Recent recommendations for assessing outcomes in patients with cLBP have included PROMIS scales; however, there is a need for further evaluation, and PROMIS GH has not been studied in this population.

METHODS

The study cohort included patients with cLBP who completed the entirety of a 3-month IPP between August 2016 and December 2018. Patient-reported outcome measures (PROMs) were analyzed before the start of the IPP and at graduation. Convergent and discriminant validity were evaluated using Pearson correlation coefficients. Known groups' validity assessed the change in PROMIS scores stratified by improvement on the Modified LBP Disability Questionnaire. Responsiveness was evaluated with standardized response means based on global impression of change.

RESULTS

IPP was completed by 217 patients (67.7% women, age 53.8 ± 12.8). Convergent validity was supported (P < 0.01 for all pairwise PROMs comparisons). All PROMs improved significantly by graduation, with the largest improvement for PROMIS pain interference, physical function, social role satisfaction, and Modified LBP Disability Questionnaire. Known groups' validity demonstrated the greatest change on PROMIS physical function, social role satisfaction, pain interference, and depression. Responsiveness was supported for all PROMs in 170 (78.3%) patients who indicated at least minimal improvement (standardized response means 0.43-1.06).

CONCLUSION

Our study provides support of PROMIS CATs, highlights the importance of including other meaningful outcome measures, such as social role satisfaction, and provides the first validation of PROMIS GH, in patients with cLBP. PROMs collection can be streamlined through the use of PROMIS CATs which offer advantages over legacy measures.

LEVEL OF EVIDENCE

3.

PROMIS Physical Function Short Forms Display Item- and Scale-Level Characteristics at Least as Good as the Roland Morris Disability Questionnaire in Patients With Chronic Low Back Pain

OBJECTIVE

To compare dimensionality, item-level characteristics, scale-level reliability, and construct validity of PROMIS Physical Function short forms (PROMIS-PF) and 24-item Roland Morris Disability Questionnaire (RMDQ-24) in patients with chronic low back pain (LBP).

DESIGN

Cross-sectional study.

SETTING

Secondary care center for rehabilitation and rheumatology.

PARTICIPANTS

Patients with nonspecific LBP ≥3 months (N=768). Mean age was 49±13 years, 77% were female, and 54% displayed pain for more than 5 years.

INTERVENTIONS

Not applicable.

MAIN OUTCOME MEASURES

Dutch versions of the 4-, 6-, 8-, 10-, and 20-item PROMIS-PF and of the RMDQ-24.

RESULTS

PROMIS-PF-6, PROMIS-PF-8, and RMDQ-24 exhibited sufficient unidimensionality (confirmatory factor analysis: comparative fit index>0.950, Tucker-Lewis index>0.950, root means square error of approximation<0.060), whereas the other instruments did not. All instruments were free of local dependence except PROMIS-PF-20 with 4 item pairs with clear residual correlations. Mokken scale analysis found 1 nonmonotone item for PROMIS-PF-20 and 8 for RMDQ-24 (ie, the probability of endorsing these items was not increasing with increasing level on the underlying construct). PROMIS-PF-20 displayed 2 misfitting items (S-χ²P value>.001). Two-parameter item response theory models found 2 items with low discrimination for RMDQ-24. All other instruments had adequate fit statistics and item parameters. PROMIS-PF-20 displayed the best scale-level reliability. Construct validity was sufficient for all instruments as all hypotheses on expected correlations with other instruments and differences between relevant subgroups were met.

CONCLUSIONS

PROMIS-PF-6, PROMIS-PF-8, and RMDQ-24 exhibited better unidimensionality, whereas PROMIS-PF-4, PROMIS-PF-6, PROMIS-PF-8, and PROMIS-PF-10 showed superior item-level characteristics. PROMIS-PF-20 was the instrument with the best scale-level reliability. This study warrants assessment of other measurement properties of PROMIS-PF short forms in comparison with disease-specific physical functioning instruments in LBP.

The addition of neurodynamic exercises to extension-oriented exercises among patients with chronic back-related leg pain: A study protocol

BACKGROUND

Patients with back-related leg pain exhibit nociceptive and neuropathic characteristics. Few studies have investigated the combination of interventions considering these characteristics.

OBJECTIVES

To investigate if the addition of neurodynamic exercises (EEN) to extension-oriented exercises (EE) promotes additional benefits in individuals with back-related leg pain and a directional preference.

METHODS

Patients will be randomized to either EE or EEN. Patients from both groups will receive 7 sessions over 3 weeks. Low back and leg pain, function, quality of life, disability, and global perceived effect will be evaluated at baseline, 3 weeks after randomization and 1-month follow-up. A linear mixed model will be used for outcomes analysis.

Outcomes research in non-specific low back pain : Knowledge transfer in clinical practice

Objective

The aims of this article are to provide an overview and discuss current concepts and future trends in outcomes research in non-specific low back pain, specifically considering the perspective of patients, patient-reported outcomes and outcome measures as well as to facilitate knowledge transfer into clinical practice.

Review strategy

The breadth of this work and the required brevity of this article were not amenable to a formal approach, such as a systematic literature review or a formal scoping review. Literature sources were identified through medical databases but different sources of information and of various methodologies were also included. Furthermore, outcomes meaningful for patients and examples of outcome measures that are applicable in clinical practice were extracted. Areas for future research were identified and discussed.

Results

Patient-reported outcomes and outcome measures are essential in patient-centered care. The assessment of the patients’ perspective is important to ensure motivation, active involvement, self-management and adherence, especially in non-pharmacological interventions for low back pain. To facilitate the use of outcome measurements for low back pain in clinical practice, future studies should focus on a clinically feasible index, which includes patient-reported as well as clinician-reported or performance-based variables. Relationships between different types of outcomes and outcome measures as well as resource and outcome-based healthcare constitute important topics for future research. New digital technologies can support continuous outcome measurement and might enable new patient-driven models of care.

Conclusion

Active patient involvement is an essential part of non-pharmacological treatment in low back pain and needs to be considered in terms of outcomes and outcome measurement.

Effect of a New Synergistic Combination of Low Doses of Acetylsalicylic Acid, Caffeine, Acetaminophen, and Chlorpheniramine in Acute Low Back Pain

The present paper continues a more complex research related to the increased synergism in terms of both anti-inflammatory and analgesic effect obtained by the addition of chlorpheniramine (CLF) to the common acetylsalicylic acid (ASA), acetaminophen (PAR), and caffeine (CAF) combination. This synergistic effect was previously highlighted both in vitro in rat models and in vivo in the treatment of migraine. The aim of the research was to further evaluate the analgesic effect of a synergistic low-dose ASA-PAR-CAF-CLF combination in the treatment of low back pain, in a parallel, multiple-dose, double-blind, active controlled clinical trial. A number of 89 patients with low back pain of at least moderate intensity were randomly assigned to receive Algopirin^® (ALG), a combinational product containing 125 mg ASA, 75 mg PAR, 15 mg CAF, and 2 mg CLF, or PAR 500 mg, a drug recognized by American Pain Society as "safe and effective" in the treatment of low back pain. One tablet of the assigned product was administered three times a day for seven consecutive days. The patients evaluated their pain level using a Visual Analog Scale prior to administration, and at 1, 2, 4, and 6 h after the morning dose. Time course of effect was similar in structure and size for both treatments. Pain relief appeared rapidly and steadily increased over 4 h after drug administration. Differential pain curves of ALG and PAR were very similar and comparable with the previously determined ALG analgesia pattern in migraine. Differences between the daily mean pain scores were not statistically significant for the two treatments. Similar results were obtained for the Sum of Pain Intensity Differences (SPID) for 0-4 h and 0-6 h intervals as well as for the time course of the proportion of patients with at least 30% and at least 50% pain relief. In conclusion, in spite of very small doses of active components, ALG proved equally effective to the standard low back pain treatment and therefore a viable therapeutic alternative, mainly for patients with gastrointestinal and hepatic sensitivity. Trial Registration: www.ClinicalTrials.gov, identifier EudraCT No.: 2015-002314-74.