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 machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.012 | 0.024 |
| Meta-epidemiology (narrow) | 0.003 | 0.002 |
| Meta-epidemiology (broad) | 0.021 | 0.035 |
| Bibliometrics | 0.006 | 0.007 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.003 | 0.002 |
| Open science | 0.002 | 0.002 |
| Research integrity | 0.002 | 0.002 |
| Insufficient payload (model declined to judge) | 0.004 | 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 source (direct Gemma or distilled Codex), 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".