Low Back and Lumbar Spine Injuries

The most common serious injury in California workers' compensation, and the one where the rating is most often wrong.

The question that decides these cases: DRE or Range of Motion?

California rates a lumbar spine one of two ways, and which method applies routinely moves the impairment number by ten to twenty points before any adjustment is applied.

The rule most often botched: a multi-level fusion takes the case out of the DRE method entirely. The Guides require Range of Motion in that situation. A two-level fusion rated as "DRE V, 28%" is very likely under-rated, and it is checkable on the face of the document.

How your back gets rated

Impairment is measured under Chapter 15 of the AMA Guides, 5th Edition. There are two methods.

The DRE method

The default for a distinct injury. The evaluator places you in one of five categories based on clinical findings — what the examination shows, not what the MRI shows.

Notice that every category is a range, not a number. DRE II is 5 to 8 percent. The spread inside the category is assigned by how much the injury affects your activities of daily living.

A report that says "DRE II, 5% WPI" without discussing your daily activities has left three points on the table. That is worth checking, because those three points survive every downstream multiplier.

The Range of Motion method

The Guides require the ROM method — not merely permit it — in specific circumstances, including:

• Fractures at more than one level
• Radiculopathy bilaterally or at multiple levels in the same region
• Multi-level alteration of motion segment integrity — which includes a multi-level fusion
• Recurrent herniation or stenosis with radiculopathy, or recurrent radiculopathy at the same level
• Impairment not caused by an injury

And here is the negative rule that matters just as much, because it is where other websites create false hope:

Multi-level disc bulges alone do not trigger ROM. Multi-level degenerative disc disease alone does not trigger ROM. Multi-level herniations without multi-level radiculopathy do not trigger ROM.

An MRI reading "multilevel degenerative changes" does not get you the ROM method. Surgery, fracture, or multi-level radiculopathy does.

Why ROM usually produces a larger number

Because it stacks three separate components: measured motion loss, plus an additional value for the specific spinal disorder — fracture, soft tissue lesion, operated stenosis — plus sensory and motor nerve deficits rated separately.

Take a worker with a two-level fusion at L4-5 and L5-S1 with residual radiculopathy.

Rated as DRE V: 25–28% impairment. Except that a multi-level fusion should not have been rated by DRE at all.

Rated by ROM: a fused two-level lumbar spine measures badly on motion. Add the value for operated stenosis, add each additional level, add sensory deficit, add motor deficit. That stack routinely lands in the mid-thirties to low forties.

For a 45-year-old warehouse worker, the difference between 26% and 38% impairment is roughly the difference between a $50,000 case and a $100,000 case. That is why this is fought.

And when both methods genuinely apply, the higher rating governs.

One pathway that gets missed entirely

Where there is spinal cord or cauda equina involvement rather than nerve root involvement, Chapter 15 provides a separate rating route covering bladder, bowel, and sexual function, along with gait and upper extremity function.

Workers with cauda equina symptoms after a disc extrusion are routinely rated on the DRE scale and never asked about bladder or sexual function at all. If that describes you, raise it.

What a rating actually looks like

A DRE-rated back produces a string beginning 15.03.01.00 — Chapter 15 (Spine), region 03 (Lumbar), method 01 (DRE).

A ROM-rated back usually produces several strings on the rating form — one for motion loss, one for the specific disorder, one for sensory deficit, one for motor deficit — which are then combined.

So a worker who receives a single-line DRE string after a two-level fusion has a visible problem on the face of the document. You do not need a medical degree to see it. Here is how to read the whole string.

Why your MRI got denied

Not because the adjuster thinks you are faking. Because the treatment guidelines set thresholds and utilization review applies them mechanically.

Imaging:

• X-ray in the first 4–6 weeks with no red flags: not recommended.
• MRI in the first six weeks: recommended only for progressive neurologic deficit, cauda equina syndrome, a cancer history, persistent fever with elevated inflammatory markers, or an atypical presentation.
• MRI at 4–6 weeks or later for radicular pain: recommended where symptoms are not improving and surgery is being considered.
• Repeat MRI without a clinical change: not recommended. This is the most common imaging denial.
• Discography: strongly not recommended.
• EMG/nerve conduction: recommended where imaging is equivocal and there is ongoing neurologic pain — but generally unhelpful in the first month.

Surgery:

• Discectomy: recommended, but requires all three of radicular pain with matching exam findings, imaging confirming compression at the predicted level, and 4–6 weeks of failed conservative care including anti-inflammatories.
• Decompression for stenosis: recommended after 4–6 weeks of failed non-operative care. Note that the guideline states fusion has no role in treating stenosis.
• Fusion for chronic non-specific back pain: not recommended — the evidence shows worse outcomes than rehabilitation, and specifically worse outcomes in workers' compensation populations.
• Fusion for spondylolisthesis: recommended, but requires documented instability on imaging.
• Spinal cord stimulator: a gauntlet — documented chronic radiculopathy with supporting electrodiagnostics, failed prior surgery, six months in a functional restoration program, an independent psychological evaluation, and a successful trial.
• A psychological evaluation before back surgery in chronic pain is recommended by the guidelines. Workers are routinely blindsided by this.

Epidural injections: recommended in select circumstances after an anti-inflammatory trial — but the guideline says there should not be a series of injections, and each one's effect must be assessed before the next.

That single sentence is the basis for most epidural denials in California, because the request is written for a series.

The fix in nearly every case is a request that either documents a red flag or documents the four to six weeks of failed conservative care with dates. More on beating a denial.

The apportionment fight

"Degenerative disc disease" is the most common defense argument in California workers' compensation, and it always reads the same way:

"MRI demonstrates multilevel degenerative disc disease with disc desiccation at L4-5 and L5-S1, findings which are age-appropriate and pre-existed the industrial injury. I apportion 50% of the permanent disability to the pre-existing degenerative process."

Four reasons that opinion is vulnerable:

It states a conclusion, not an analysis. Under Escobedo, the physician must explain how and why the non-industrial factor caused the percentage assigned. A pathology plus a number is not reasoning, and a percentage without reasoning is not substantial evidence.

It apportions the wrong thing. The statute apportions permanent disability — not injury, and not pathology. The question is not what share of the disc degeneration is non-industrial. It is what share of the disability — the impairment and its effect on your daily activities — comes from the degeneration rather than the injury. In City of Jackson, the appellate court approved an apportionment opinion specifically because the doctor apportioned disability causation, not injury causation.

Degeneration on an MRI is not proof of contribution. We will be straight with you: City of Petaluma v. WCAB (Lindh) is not good law for injured workers, and an asymptomatic pre-existing condition can support apportionment. But Lindh requires that the disability result from both industrial and non-industrial causes. Nearly every adult over forty has degenerative changes on a lumbar MRI and no disability whatsoever. The defense has to connect this degeneration to this disability, not just point at the film.

And the evaluator has to have done the work. Did they review pre-injury records? Was there any prior treatment, any prior complaint, any prior lost time? Were you working full duty without restriction the day before? What is the medical basis for 50% rather than 20%? In City of Jackson the opinion survived because the physician cited specific literature. An evaluator who cites nothing has a materially weaker opinion.

Two more things worth knowing. Where there is a prior award of permanent disability to the same region, a conclusive presumption applies that the prior disability persists — but the defendant bears the burden of proving the prior award and the overlap. And where part of your disability comes from failed back surgery — a fusion that did not take, adjacent segment failure, post-laminectomy syndrome — there is a real argument under Hikida against apportioning that portion at all.

What surgery does to your rating

This surprises people, and it should be understood before you decide.

Discectomy or decompression alone does not alter motion segment integrity. If the radiculopathy resolves, you may drop to DRE II — 5 to 8 percent. If it persists, DRE III — 10 to 13 percent.

Which means a successful discectomy can lower your rating.

A single-level fusion produces loss of motion segment integrity, which is DRE IV — 20 to 23 percent — or DRE V, 25 to 28 percent, with residual radiculopathy.

A multi-level fusion takes the case out of DRE entirely and requires the ROM method. This is the most valuable rule in a California back case and the most frequently missed.

Hardware failure, pseudarthrosis, and adjacent segment disease each support the ROM method — and each supports the argument against apportioning treatment-caused disability.

And where DRE plainly understates what happened to you — a single-level fusion with severe measured motion loss and profound limitation, sitting at 20% — a physician may under Almaraz/Guzman provide the strict rating, explain why it fails to capture the impairment, and provide an alternate rating using the ROM method. That is a comparatively strong argument, because it stays inside the same chapter rather than analogizing to a different body part.

The jobs that cause it

Low back cumulative trauma clusters where the work combines sustained bending, repetitive lifting from below knee height, twisting under load, and whole-body vibration:

Warehouse and order picking. Nursing, CNA, home health, and patient transport — patient handling is the highest-force manual handling in the economy. Construction, framing, drywall, and concrete. Delivery and route driving. Agricultural field work. Housekeeping and janitorial. Grocery stocking. Baggage handling.

If your back got worse over years rather than in one moment, that is a cumulative trauma claim — and the date of injury analysis is what determines whether it is timely, which employer pays, and what benefit rates apply. That analysis is here.

Seven things other websites get wrong

"Your MRI shows a herniated disc, so you have a rating." No. DRE placement requires clinical findings, not imaging. A herniation with a normal neurologic exam and no observed guarding is DRE I — zero percent. The Guides rate the person, not the film.

"Surgery increases your settlement." Not automatically, and sometimes the reverse.

"Multi-level degenerative disc disease means you get the ROM method." Flatly wrong, and the most common false-hope error in this category.

Publishing a single number per category. DRE II is 5 to 8 percent, not 5. Content that prints the floor teaches workers to accept the floor.

Treating impairment and disability as the same thing. They are not. In the state's own published example, 8% whole person impairment became 15% permanent disability.

Ignoring the measurement validity rules. A ROM rating built on measurements that fail the consistency requirements is not a rating at all. And giving inconsistent effort does not produce a higher number — it produces an invalid measurement, which means the method cannot be used.

Telling you Lindh helped injured workers. It did not. Honest content says so.

Frequently asked questions