Oral non-benzodiazepine muscle-relaxants for people with acute and chronic primary low back pain: a systematic review with meta-analysis
Bibliographic record
Abstract
PURPOSE: To determine benefits and adverse effects (AE) of oral muscle-relaxants (MR) (non-benzodiazepines) for acute (< 6 weeks) and chronic (> 12 weeks) primary LBP, administered alone or combined with analgesics/NSAIDs. METHODS: CENTRAL, MEDLINE, EMBASE, CINAHL were searched for pertinent randomized controlled trials. Primary outcomes comprised lack of pain relief, global efficacy and AE at 5-7 days follow-up assessed dichotomously (risk ratio, RR). RESULTS: Fifty studies (7531 participants) were included, with data from 4775 pooled in meta-analyses. For acute LBP, non-benzodiazepine MR were associated with increased likelihood of pain relief (moderate certainty; RR: 0.53, p < 0.0001), global efficacy (RR: 0.49, p = 0.0001), muscle spasm (RR: 0.62, p < 0.00001), and physical outcomes (RR: 0.60, p < 0.00001) compared to placebo. AE were more frequent with non-benzodiazepine MR compared to placebo (low-to-moderate certainty; RR: 1.56; p = 0.003), and at central nervous system (CNS; RR: 2.40; p < 0.00001), but not at gastrointestinal (GI) level (RR: 0.77; p = 0.62). Combined non-benzodiazepines + analgesics/non-steroidal anti-inflammatory drugs (NSAIDs) provide a larger and clinically meaningful benefit compared to placebo + analgesics/NSAIDs for global efficacy at 5-7 days (low-certainty; RR: 0.62; p = 0.01). Combined therapy did not result in significant between-group differences for total AE (moderate-certainty; RR: 1.15; p = 0.50) and GI AE (RR: 0.63; p = 0.08), despite responsible for more CNS AE (low-certainty; RR: 1.91; p = 0.002). When comparing non-benzodiazepine MR versus placebo for chronic LBP, only data on total AE could be pooled, without between-group difference (RR: 0.93; p = 0.69). CONCLUSIONS: Non-benzodiazepine MR for acute LBP were associated with increased likelihood of pain relief and global efficacy compared to placebo. Combined therapy with analgesics/NSAIDs proved superior for global efficacy. Studies are needed to evaluate if non-benzodiazepine MR are of larger benefit than analgesics/NSAIDs, and if stand-alone administration provides more benefit than combined treatment. The observed AE warrant caution.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.006 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.010 | 0.004 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".