Som resultat af de forrige indlæg bør det fremgå tydeligt at (længerevarende) smerte er et fænomen af mange (individuelle) facetter, og at den ene form for (smertefri) fysisk aktivitet sandsynligvis virker lige så godt som den anden. Det ville være fedt hvis én trænings/behandlingsform virkede hver gang og for alle individer, men – på trods af at flere gerne vil overbevise dig om det modsatte – er dette ikke tilfældet.
Dette betyder dog ikke at man undlader at undersøge faktorer som potentielt kan bidrage til smerte; i dette tilfælde smerter i lænderyggen (LBP), da det er en af de hyppigste. Her følger en række konklusioner fra et systematisk review af litteraturen inden for arbejds-relaterede faktorer af potentiel betydning for udviklingen af lænde-smerte.
1. Occupational bending and twisting. Beskrivelsen dækker givetvis over en bredere job-kategori.
A summary of existing studies was not able to find high-quality studies that satisfied more than three of the Bradford-Hill criteria for causation for either occupational bending or twisting and LBP. Conflicting evidence in multiple criteria was identified. This suggests that specific subcategories could contribute to LBP. However, the evidence suggests that occupational bending or twisting in general is unlikely to be independently causative of LBP.
2. Akward postures.
There was strong evidence from six high-quality studies that there was no association between awkward postures and LBP. Similarly, there was strong evidence from three high-quality studies that there was no temporal relationship. Moreover, subgroup analyses identified only a handful of studies that demonstrated only weak associations and no evidence for other aspects of causality in certain specific subcategories. It is therefore unlikely that awkward occupational postures are independently causative of LBP in the populations of workers studied.
3. Occupational sitting
This review failed to uncover high-quality studies to support any of the Bradford-Hill criteria to establish causality between occupational sitting and LBP. Strong and consistent evidence did not support criteria for association, temporality, and dose response. Based on these results, it is unlikely that occupational sitting is independently causative of LBP in the populations of workers studied.
4. Manual handling or assisting patients.
The studies reviewed did not support a causal association between workplace manual handling or assisting patients and LBP in a Bradford-Hill framework. Conflicting evidence in specific subcategories of assisting patients was identified, suggesting that tasks such as assisting patients with ambulation may possibly contribute to LBP. It appears unlikely that workplace manual handling or assisting patients is independently causative of LBP in the populations of workers studied.
5. Pushing or pulling.
A qualitative summary of existing studies was not able to find any high-quality studies that fully satisfied any of the Bradford-Hill causation criteria for occupational pushing or pulling and LBP. Based on the evidence reviewed, it is unlikely that occupational pushing or pulling is independently causative of LBP in the populations of workers studied.
6. Occupational lifting.
This review uncovered several high-quality studies examining a relationship between occupational lifting and LBP, but these studies did not consistently support any of the Bradford-Hill criteria for causality. There was moderate evidence of an association for specific types of lifting and LBP. Based on these results, it is unlikely that occupational lifting is independently causative of LBP in the populations of workers studied. Further research in specific subcategories of lifting would further clarify the presence or absence of a causal relationship.
7. Occupational carrying.
This review failed to identify high-quality studies that supported any of the Bradford-Hill criteria to establish causality between occupational carrying and LBP. Based on these results, it is unlikely that occupational carrying is independently causative of LBP in the populations of workers studied.
8. Occupational standing and walking.
A summary of existing studies was not able to find any high-quality studies that satisfied more than two of the Bradford-Hill causation criteria for occupational standing or walking and LBP. Based on the evidence reviewed, it is unlikely that occupational standing or walking is independently causative of LBP in the populations of workers studied.
Som det fremgår er det svært at identificere enkeltstående faktorer som har en stærk korrelation med udviklingen af smerte i lænderyggen. Om nogle, lader det ud fra ovenstående review til at foroverbøjning (med/uden rotation) og diverse løft kan have relevans. Samlet betyder dette at man skal undgå at løfte tungt med en rygsøjle i fleksion (og rotation), hvilket de fleste med lidt løfte-erfaring kan nikke genkendende til.
Herudover siger det også noget om at andre faktorer ift. udviklingen af LBP er relevante, og at arbejdsstillinger/opgaver/forhold langt fra kan forklare den store udbredning af LBP som ses inden for bl.a. SOSU- og sygeplejepersonalet. Det kunne tænkes at denne individgruppe har mindre tendens til at indgå i fornuftige kost- og træningsvaner. Endvidere fortæller ovennævnte hvad vi allerede ved; at det er svært at pege på én eller to enkeltstående faktorer når vi gerne vil forsøge at forklare Bente hvorfor hun stadig har ondt i ryggen. Bevægelse lader dog til at være et godt sted at starte forebyggelsen/rehabilitationen.
Andersen JH, Haahr JP, Frost P. Details on the association between heavy lifting and low back pain. Spine J. 2011 Jul;11(7):690-1.