Small effects of treatments for non-specific low back pain: how can we improve patients' outcomes?

Low Back Pain: What Have Clinical Guidelines Ever Done for Us?

The burden that low back pain (LBP) presents to sufferers and society is well established. This ubiquitous condition is served by a complex global clinical marketplace offering a wide range of assessment alternatives and accompanying interventions. Yet, while the costs of care are rising, the global burden does not appear to be diminishing. Considerable effort internationally has gone into developing CPGs for LBP. The authors highlight the similarities and differences between existing CPGs for LBP, as well as strengths, weaknesses, and opportunities for improvement in the implementation of guidelines generally. J Orthop Sports Phys Ther 2018;48(2):54-57. doi:10.2519/jospt.2018.0602.

The effect of changing movement and posture using motion-sensor biofeedback, versus guidelines-based care, on the clinical outcomes of people with sub-acute or chronic low back pain-a multicentre, cluster-randomised, placebo-controlled, pilot trial

Background

The aims of this pilot trial were to (i) test the hypothesis that modifying patterns of painful lumbo-pelvic movement using motion-sensor biofeedback in people with low back pain would lead to reduced pain and activity limitation compared with guidelines-based care, and (ii) facilitate sample size calculations for a fully powered trial.

Methods

A multicentre (8 clinics), cluster-randomised, placebo-controlled pilot trial compared two groups of patients seeking medical or physiotherapy primary care for sub-acute and chronic back pain. It was powered for longitudinal analysis, but not for adjusted single-time point comparisons. The intervention group (n = 58) received modification of movement patterns augmented by motion-sensor movement biofeedback (ViMove, dorsaVi.com) plus guidelines-based medical or physiotherapy care. The control group (n = 54) received a placebo (wearing the motion-sensors without biofeedback) plus guidelines-based medical or physiotherapy care.

Primary outcomes were self-reported pain intensity (VAS) and activity limitation (Roland Morris Disability Questionnaire (RMDQ), Patient Specific Functional Scale (PSFS)), all on 0–100 scales. Both groups received 6–8 treatment sessions. Outcomes were measured seven times during 10-weeks of treatment and at 12, 26 and 52 week follow-up, with 17.0 % dropout. Patients were not informed of group allocation or the study hypothesis.

Results

Across one-year, there were significant between-group differences favouring the intervention group [generalized linear model coefficient (95 % CI): group effect RMDQ −7.1 (95 % CI–12.6;–1.6), PSFS −10.3 (−16.6; −3.9), QVAS −7.7 (−13.0; −2.4); and group by time effect differences (per 100 days) RMDQ −3.5 (−5.2; −2.2), PSFS −4.7 (−7.0; −2.5), QVAS −4.8 (−6.1; −3.5)], all p < 0.001. Risk ratios between groups of probability of improving by >30 % at 12-months = RMDQ 2.4 (95 % CI 1.5; 4.1), PSFS 2.5 (1.5; 4.0), QVAS 3.3 (1.8; 5.9).

The only device-related side-effects involved transient skin irritation from tape used to mount motion sensors.

Conclusions

Individualised movement retraining using motion-sensor biofeedback resulted in significant and sustained improvements in pain and activity limitation that persisted after treatment finished. This pilot trial also refined the procedures and sample size requirements for a fully powered RCT.

This trial (Australian New Zealand Clinical Trials Registry NCT01572779) was equally funded by dorsaVi P/L and the Victorian State Government.

Nonspecific low back pain: assessment of available medications

Many medications have been evaluated for the treatment of nonspecific low back pain. The only medications proven to be more effective than a placebo in chronic low back pain are nonsteroidal antiinflammatory drugs (NSAIDs), the acetaminophen-tramadol combination, antidepressants other than selective serotonin reuptake inhibitors, and some types of spinal applications of glucocorticoids or local anesthetics. However, the efficacy of these drugs in inducing pain relief is limited, and NSAIDs are the only drugs that also improve function. Nevertheless, the outcome of nonspecific low back pain is favorable in most cases, even in placebo-treated patients. In addition, treatment effects vary dramatically across studies. One factor in this variability is the heterogeneity of patient populations. To improve the uniformity of patient populations enrolled in therapeutic trials, the selection criteria should take into account the nociceptive, dysfunctional, and possible neuropathic components of the pain syndrome.