Shoulder Injuries

You tore your rotator cuff. You had surgery. You got your rating back and it was almost nothing.

You are not imagining it, and nobody is cheating you. The AMA Guides contain no impairment value for a rotator cuff tear at all.

The two sentences that explain nearly every shoulder rating in California:

A shoulder surgery that restores motion reduces your rating. A shoulder surgery that removes bone adds a fixed value.

The tear itself is worth nothing. Only the motion you lost — and one specific procedure — carry a number.

Why the number is so low

Three things compound.

First, the conversion. Shoulders are rated in upper extremity percent, then converted to whole person at a fixed ratio: 100% upper extremity equals 60% whole person. So a report saying "20% upper extremity impairment" is 12% whole person — not 20% disability.

Workers read that first number and understandably assume it is their case. Consumer websites quoting upper extremity figures as if they were whole person numbers overstate by two thirds.

Second, there is no diagnosis-based value. Chapter 16 gives the shoulder essentially one method — range of motion — plus a short table for joint replacement and bone resection.

There is no entry for a rotator cuff tear. There is no entry for a labral or SLAP tear. A worker with a documented full-thickness supraspinatus tear, surgically repaired, who recovers motion has a strict rating of zero — no matter how much pain remains or how much lifting capacity was lost.

That is not an oversight by your doctor. It is what the book says.

Third, weakness generally cannot be rated. The Guides permit a strength rating "only in the rare case," and strength cannot be rated where there is decreased motion, pain, or deformity.

Almost every shoulder case involves decreased motion or pain. So almost no shoulder case gets anything for weakness — which is the single most common source of felt injustice in this body part, and it is a real rule, not an evaluator's choice.

What actually carries a value

Check your operative report for this one word

Distal clavicle resection — also written as "Mumford," "distal clavicle excision," or "co-planing."

It carries a fixed 10% upper extremity impairment, combined with any motion loss on top of it. It is frequently the largest single component of a shoulder rating.

And it is routinely omitted, because surgeons often perform it at the same time as a cuff repair and it gets buried in the middle of the operative report. If it happened and it is not in your rating, that is a real, checkable gap.

And if you had a reverse replacement

Reverse total shoulder arthroplasty was not in general use when the Guides were written in 2001, and the text does not address it.

That matters, because the procedure deliberately trades motion for stability — so rating it on motion alone badly understates what happened. This is one of the cleanest arguments in California for a physician to give the strict rating, explain why it fails, and provide an alternate rating under Almaraz/Guzman.

If you had a reverse replacement and were rated on range of motion alone, that is worth a second look.

What the treatment guidelines say

The shoulder guideline was replaced effective January 2, 2026. Every competitor page describing California shoulder treatment standards is currently out of date.

What that means when your treatment gets denied:

A shoulder MRI denial is worth appealing. It carries the highest grade of recommendation in the guideline.

A denial of steroid injection for frozen shoulder is worth appealing. Also the highest grade.

PRP will be denied, every time. "No recommendation, insufficient evidence" produces an automatic denial under the review rules.

And a denial of cuff repair for a chronic massive tear is a substantive denial, not a paperwork problem. That is the most common shoulder surgery denial in an older worker with a retracted, atrophied tear — and it is the guideline's actual position, so the appeal has to be built on why this worker is different, not on a procedural defect. How to check a denial for defects anyway.

The apportionment fight

What the defense evaluator writes:

"MRI of the uninjured shoulder demonstrates a partial-thickness tear. The literature establishes that the prevalence of asymptomatic rotator cuff tears exceeds 50% in individuals over 60. The applicant's tear is degenerative rather than traumatic. I apportion 60% to pre-existing degenerative disease."

The epidemiology is real. Asymptomatic cuff tears genuinely are common with age, and they are frequently bilateral.

But the literature cuts both ways, and this is the strongest single argument in a shoulder case.

If more than half of people over sixty have asymptomatic cuff tears and are not disabled, then the tear by itself does not produce disability. What produced disability was the industrial event that converted an asymptomatic tear into a symptomatic, function-limiting one.

The defense's own literature establishes that the pre-existing condition produced no disability in the majority of people who have it. Apportionment is to disability, not to pathology.

Three more angles:

The percentage has to be explained. Why 60% rather than 25%? What in the record — prior treatment, prior complaint, prior restriction, prior imaging — supports it? An evaluator who reviewed no pre-injury records has no factual basis for any number.

The imaging can rebut chronicity. The defense uses fatty infiltration of the muscle and tendon retraction to argue the tear is old. Their absence — along with fluid signal, muscle edema, an acute mechanism, and immediate loss of function — supports an acute traumatic tear. That is technical, and it is where these cases are actually won.

And frozen shoulder is usually a consequence of the treatment. Post-operative or post-immobilization adhesive capsulitis is frequently the largest part of the impairment, and where it flows from industrial treatment there is a real argument against apportioning it at all.

What the work does

Shoulder cumulative trauma comes from sustained or repeated work at or above shoulder height, and from load-bearing on a raised arm:

Warehouse order-selectors and stockers reaching to upper racks. Painters, drywall finishers, electricians, HVAC and overhead installers. Auto mechanics working under a lift. Grocery clerks stocking upper shelves. Nurses, CNAs, and caregivers lifting and repositioning patients. Hotel housekeepers — bed-making, high dusting, curtains and linen. Assembly and packing lines with elevated conveyors. Longshore and baggage handling. Hairstylists and barbers. Firefighters and law enforcement.

The mechanism is repeated compression of the supraspinatus tendon during elevation, producing degeneration inside the tendon and eventually a partial and then full-thickness tear — with secondary arthritis at the AC joint from repeated load.

If your shoulder wore out over years rather than in one moment, that is a cumulative trauma claim. How those work.

Frequently asked questions