Not every work injury happens in a single moment. Carpal tunnel syndrome, tendinitis, a worn-out rotator cuff, or knees damaged by years of kneeling on concrete develop slowly, often without one event to point to. Missouri law does cover these injuries. Repetitive-stress claims are harder to win than a fall from a ladder, though, and the rules for proving and reporting them catch many workers off guard.
Missouri Treats Repetitive Trauma as an Occupational Disease
Since the 2005 reforms, Missouri classifies injuries caused by repetitive motion as occupational diseases under Section 287.067. That classification matters because it brings its own standard of proof, its own notice deadline, and its own rules for deciding which employer is responsible.
Common examples include:
- Carpal tunnel syndrome and trigger finger from assembly, typing, or tool work.
- Tendinitis and epicondylitis (“tennis elbow”) from repeated gripping or lifting.
- Shoulder and rotator cuff damage from overhead work.
- Back, hip, and knee conditions from repeated bending, kneeling, or heavy lifting.
The “Prevailing Factor” Standard Is the Real Hurdle
It isn’t enough to show that your job contributed to the injury. Missouri requires that your work be the prevailing factor, meaning the primary cause compared to every other cause, of both the medical condition and the resulting disability.
This is where most repetitive-stress claims are contested. Insurers commonly point to age, arthritis, diabetes, weight, hobbies, or a previous job as the real cause, and Missouri law excludes conditions caused by normal aging or everyday activities outside work. A clear medical opinion that ties your condition to specific job duties is usually what makes or breaks the claim.
The 30-Day Notice Rule Starts at Diagnosis
For a sudden accident, you have 30 days from the incident to notify your employer. For repetitive trauma, the 30 days generally start when a doctor diagnoses the condition and connects it to your work.
That notice must be in writing and should describe the time, place, and nature of the injury. Late notice isn’t automatically fatal, but you then have to prove your employer wasn’t harmed by the delay, which is an unnecessary fight. If a doctor tells you your wrist or shoulder problem is work-related, notify your employer in writing that week.
Which Employer Is Responsible?
Repetitive injuries often build up across more than one job. Missouri has a specific rule for this situation. If you were exposed to the repetitive motion with your current employer for less than three months, and the work at your previous employer was the prevailing factor, the previous employer may be responsible instead. Changing jobs doesn’t end your claim, but it can change who you file it against.
What Benefits Are Available
An approved claim can cover:
- Medical treatment, including surgery and therapy, usually with a doctor chosen by the employer or insurer.
- Temporary total disability benefits while you can’t work, at two-thirds of your average weekly wage. For injuries on or after July 1, 2026, the maximum is $1,294.71 per week.
- Permanent partial disability benefits for lasting loss of function, up to $678.18 per week for injuries in the same period.
- Mileage reimbursement for medical travel.
Unlike a personal injury lawsuit, workers’ compensation doesn’t depend on proving anyone was at fault. You also can’t recover pain and suffering. We explain how fault works in injury cases outside the work comp system in our article on Missouri’s comparative fault rule.
Don’t Let a Slow Injury Become a Lost Claim
You should also file a formal claim with the Division of Workers’ Compensation, generally within two years. That deadline extends to three years if your employer never filed a report of injury. Waiting until the pain is unbearable often means missed deadlines and weaker medical evidence.
At Wegmann Law Firm, we have spent more than 50 years helping workers in Hillsboro, Jefferson County, and across Missouri through our workers’ compensation practice. If your job is wearing your body down, contact us today to find out whether your injury qualifies and what to do before your employer’s insurer decides for you.
