Carpal Tunnel and Repetitive Strain

Two facts that explain almost every disappointing hand and wrist rating in California:

Loss of grip strength is expressly excluded. The Guides state that in compression neuropathies, no additional impairment is given for decreased grip strength. The most intuitive complaint — "I can't hold anything" — is specifically written out of the rating.

And four of the most common repetitive strain diagnoses have no impairment value at all unless they leave a measurable motion deficit or a documented nerve deficit. De Quervain's, trigger finger, tennis elbow, and golfer's elbow routinely rate at zero after successful treatment.

That is not an adjuster's trick. It is what the book says. And it does not affect your right to medical treatment or to wage replacement while you are off work — those are separate entitlements.

How carpal tunnel is actually rated

Diagnosis requires three things: symptoms, objective findings on examination, and electrodiagnostic testing — the nerve conduction study. The Guides are explicit that normal electrodiagnostic testing does not permit a diagnosis of nerve compromise for rating purposes.

That produces three scenarios, and nearly every California carpal tunnel rating falls into one of them:

Scenario two is the workhorse. A great many California carpal tunnel cases resolve at 3% whole person, and that is the correct application of the strict method — even after a release.

Post-operative carpal tunnel is rated the same way as pre-operative. There is no additional value for having had the surgery.

And where the exam and the studies are both positive, impairment is computed from the grade of sensory deficit and the grade of motor deficit separately, then combined — with severe cases involving thenar atrophy and marked sensory loss reaching 12 to 18% whole person.

One limit worth knowing: a maximum of three simultaneous focal neuropathies may be rated under this chapter. A worker with bilateral carpal tunnel plus cubital tunnel plus a radial sensory neuropathy is at the edge of it.

When the strict method produces nothing

Because scenario three produces zero for a worker with real symptoms and clean studies, and scenario two caps at 3%, California evaluators sometimes reach for alternatives.

There are recognized ones — rating by analogy to a comparable condition, the Guides' own chronic-pain criteria for the upper extremity, or rating the measured loss of pre-injury capacity.

We are going to be straight about these: they are arguments, not entitlements. They are used, they are contested, and they sometimes win. A website telling you that carpal tunnel is "worth more than 3%" as though it were settled law is not being honest with you.

What is true is that the strict method has a known floor, the reasons for it are explainable, and where it plainly fails to capture what happened to someone, there is a recognized route to a more accurate rating that a physician has to build deliberately.

The other repetitive strain conditions

This is the defining fact of the repetitive strain category, and almost nobody explains it. These conditions are real, they are compensable, they entitle you to treatment and to temporary disability — and if treatment works and your motion comes back, the permanent rating is zero.

Knowing that in advance is better than discovering it at the end.

Check your rating string

Carpal tunnel is coded as a nerve impairment, not a wrist impairment — 16.01.02.02. That is different from the codes used for wrist motion loss.

And bilateral carpal tunnel should generate two strings, one per hand, each converted and then combined.

A worker with bilateral carpal tunnel who receives a single string has a checkable problem. How to read the whole string.

The apportionment fight

Expect: diabetes, obesity, thyroid disease, pregnancy, age, and non-work keyboard use.

Several of those are genuine risk factors for carpal tunnel and there is no point pretending otherwise. But the same rules apply as everywhere else.

The apportionment is to disability, not to risk factors. A condition that raises the statistical likelihood of developing carpal tunnel is not the same as a condition that caused a measurable percentage of this worker's permanent disability. And under Escobedo, the opinion has to explain how and why — a percentage without reasoning is not substantial evidence.

The most useful questions: did the evaluator review pre-injury records? Was there any prior hand complaint, treatment, or restriction? Was the worker doing the full job without limitation before? What is the medical basis for this percentage rather than another?

The jobs that cause it

Repetitive strain claims cluster where the work involves high-repetition gripping, pinching, wrist deviation, forceful twisting, or vibration:

Sewing machine operators — thousands of pinch-grip cycles an hour. Warehouse packers on tape guns and scanners. Line cooks and prep cooks on knife work. Baristas on tamping and portafilters — de Quervain's is notably common. Hotel housekeepers scrubbing and tucking. Janitors on wringers and scrubbing. Assembly and packing lines. Cashiers and grocery scanners. Dental hygienists. Longshore workers on turnbuckles. Landscapers and construction trades using vibrating tools.

How cumulative trauma claims work.

Frequently asked questions