Repetitive injuries are the most underclaimed category in California workers' comp. Carpal tunnel from data entry, lower back damage from years of lifting, shoulder tears from overhead work, all are compensable, but they require a different kind of proof than a slip-and-fall.
What California Calls Cumulative Trauma
Under California law, a "cumulative trauma" injury is one that develops gradually over time from repetitive activity at work. Unlike a specific injury (one event, one date), the date of injury for cumulative trauma is the day you first knew, or with reasonable diligence should have known, that the condition was work-related. That is usually the day a doctor first connects it for you.
Common Cumulative Trauma Injuries
- Carpal tunnel syndrome (data entry, line cooking, assembly, dental hygienists)
- Cubital tunnel syndrome at the elbow
- Lateral epicondylitis (tennis elbow) and medial epicondylitis
- Rotator cuff tears and impingement (warehouse, painters, hairstylists, mechanics)
- Degenerative disc disease and disc herniation from chronic lifting
- Knee and hip osteoarthritis from years of standing on concrete
- Plantar fasciitis from prolonged standing
- Hearing loss from industrial noise exposure
- Vocal cord nodules in teachers, performers, call center workers
What You Have to Prove
Two things, in plain terms:
- Your job involved repetitive activity that medical literature recognizes as a cause of your condition
- That activity was a substantial contributing factor to your specific diagnosis
"Substantial" does not mean exclusive. Pre-existing arthritis or genetic predisposition does not defeat the claim, but it can lead to apportionment, where part of the disability is assigned to non-industrial causes.
What the Insurance Carrier Argues
Predictable defenses on cumulative trauma claims:
- The condition is purely degenerative (age-related, genetic, not work-related)
- You have other activities that explain it (hobbies, second jobs, prior injuries)
- The job duties you describe do not match the job description on file
- You waited too long to report it
- The treating doctor's causation analysis is conclusory and unsupported
The defense playbook starts with sending the file to a QME or hiring a defense expert who can argue degenerative cause. Your job (and your attorney's) is to make sure the work cause is documented before that fight starts.
How to Build the Record
- Describe the job in detail. Tasks, frequency, duration, postures, weights lifted, repetitions per shift, total years on the job. Generic descriptions ("I work in a warehouse") are weak. Specific ones ("I lift 25 to 50 pound boxes from floor to chest height, roughly 200 times per shift, eight hours a day, five days a week, for seven years") are strong.
- Get an ergonomic or job analysis if the case is complex. A vocational expert can describe the biomechanics of your work in a way that ties to medical findings.
- Pick a treating doctor familiar with occupational medicine. Family practice doctors often write good clinical notes but weak causation reports. Occupational medicine and orthopedic specialists who handle comp regularly are better.
- Ask the doctor to issue an explicit causation report citing the AMA Guides and the relevant medical literature. The report should describe the job duties (drawn from your own statement) and explain why those duties caused or contributed to the diagnosed condition.
- Document the timeline of symptoms. When pain started, when it got worse, what activities aggravated it, when you first sought care.
Apportionment, the Quiet Killer
California allows apportionment between industrial and non-industrial causes. A QME might find 70 percent of the disability is from work and 30 percent from pre-existing causes. You collect on the 70 percent.
Apportionment is often the most contested part of these cases. Pushing back requires either better medical reporting or a deposition of the QME to challenge the basis for the apportionment opinion.
Statute of Limitations on Cumulative Trauma
One year from the "date of injury," which for cumulative trauma is the date you first knew (or should have known) the condition was work-related, often the date of your first medical evaluation that made the connection. That is later than most people assume, which means cases that look "too old" sometimes are not.
What These Cases Are Worth
It depends entirely on the body part, the severity, and whether surgery is required. Real ranges from cases we have handled in LA:
- Bilateral carpal tunnel with surgical release, both wrists: $60,000 to $110,000
- Cumulative back injury, no surgery, 18 to 25 percent PD: $35,000 to $60,000
- Cumulative back, surgical fusion, 40 percent PD: $130,000 to $200,000
- Rotator cuff tear with surgery, single shoulder: $50,000 to $90,000
- Industrial hearing loss, bilateral: $20,000 to $60,000 depending on severity
Numbers move with the year of injury and the specifics. The point is that "repetitive" does not mean "small."
Hurt on the job in Los Angeles? Talk to a real workers' comp attorney. Free, confidential, in English, Español, or Հայերեն. Call (747) 777-5977 or send a message.