Participatory Ergonomics Intervention to Prevent Work Disability Among Workers with Low Back Pain: A Randomized Clinical Trial in Workplace Setting.
Erja Sormunen, Eija Mäenpää-Moilanen, Hilkka Ylisassi and 4 others
PMID 35384630WHAT IT FOUND
Adding workplace ergonomic visits to standard physiotherapy counselling did not improve work ability compared to counselling alone.
Both groups saw similar pain reduction and absence rates, so this participatory approach showed no added benefit for preventing work disability.
Key findings
01The primary outcome, self-assessed work ability, did not differ significantly between the intervention and control groups over 12 months.
02There were no statistically significant differences between the groups in sickness absence days, work productivity, or severity of low back pain.
03Participants in the high-risk psychosocial group showed greater reduction in pain severity with the intervention than low/moderate-risk participants, though this was a subgroup finding.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The study was underpowered, recruiting only 107 participants against a target of 180, which increases the risk of missing true differences. Recruitment criteria were changed mid-study to include workers with longer sickness absences, making the groups more heterogeneous than originally planned. The control group still received standard occupational health services, which may have included some workplace modifications, diluting the contrast between groups. Implementation of the ergonomic solutions varied, and for nearly half the proposed solutions, the implementation schedule was not clearly recorded.
Declared interests
The study was funded by the Finnish Work Environment Fund (Työsuojelurahasto). No other conflicts of interest are explicitly declared in the text provided.
The easy way to misread this
Do not conclude that participatory ergonomics are ineffective for all patients. The study was underpowered and the primary outcome was null, but a subgroup of high-risk patients showed pain reduction. This is a signal for further research, not proof of failure.