Medical evidence did not establish exposures caused 'compensable worsening' of pre-existing condition, finds Alberta tribunal
A worker who says she repeatedly asked her employer for a safer truck and an ergonomic review has lost her back injury appeal in Alberta, even though the tribunal agreed her driving duties were hazardous.
On May 15, 2026, the Appeals Commission for Alberta Workers' Compensation panel denied the claim, finding the worker's driving exposed her to a real workplace hazard, but the medical evidence did not show her job caused her degenerative spinal condition.
Progressive back pain
The worker drove up to 5,000 kilometres a month to remote communities, with routes that "frequently involved prolonged travel on rough gravel roads, sometimes for up to an hour and a half after leaving the highway."
She operated a government-issued pickup truck with poor suspension and rudimentary seating, and described significant jarring and bouncing while driving.
The worker says she asked for a replacement vehicle with improved suspension and an ergonomic assessment. According to her representative's submission, "these concerns were not addressed by the employer."
The worker filed a claim for progressive low back pain that she said began on Oct. 1, 2019, attributing it to driving duties that had increased to roughly 1.5 hours each way over the past year.
The Workers' Compensation Board denied the claim on April 17, 2020, and the Dispute Resolution and Decision Review Body upheld that denial on Aug. 26, 2020. The worker stopped working on May 15, 2024, underwent surgery in November 2025, and anticipated a return to work in May 2026.
'Severe’ arthritic changes
The panel accepted that the working conditions were hazardous, finding the worker "was required to operate a vehicle with inadequate suspension over extended distances on poorly maintained gravel roads" and that these conditions "exposed her to repeated whole-body vibration and jarring forces beyond those ordinarily associated with routine highway driving."
But the medical evidence pointed the other way. The WCB medical consultant reviewed the claim on April 1, 2020 and noted that current medical literature generally identifies disc degeneration as primarily associated with genetic and age-related factors rather than occupational driving exposures. MRI imaging demonstrated "very severe arthritic and spondylotic changes in the lumbar spine, with evidence of further progression."
The treating specialist initially stated on Aug. 18, 2025 that environmental factors contributed to the progression of the worker's spinal degeneration. After receiving a more detailed inquiry, the specialist advised on April 6, 2026 that "although the driving exposures may have exacerbated the worker's symptoms, he could not identify objective medical evidence establishing that the work duties caused deterioration of the underlying condition."
The panel placed greater weight on the later opinion.
Non-occupational factors
Under WCB Policy 03-02, a claim may be accepted where a workplace accident causes a pre-existing condition to deteriorate or become symptomatic to the point that the worker cannot perform all aspects of the job. The panel noted that compensable aggravation "does not necessarily require evidence of permanent structural change or radiographic deterioration."
The panel found the worker experienced increased symptoms during prolonged driving, but that her symptoms improved when her driving exposure decreased, which it found "more consistent with temporary symptom provocation than with a compensable aggravation of the underlying condition."
The panel also considered a fall on Dec. 20, 2018, after which medical reporting documented increasing pain and loss of function, supporting the conclusion that non-occupational factors were contributing to the worker's presentation.
In confirming the denial, the panel concluded: "While the worker was exposed to working conditions capable of increasing her symptoms, the medical evidence does not establish that those exposures caused a compensable worsening of her pre-existing degenerative condition."
