“The surgery made it worse.”

The basic rule first

A compensable consequenceCompensable consequence A new problem caused by the original injury or its treatment. Overusing the other side, the joint above or below, a surgical complication. is compensable. If the employer’s obligation to provide treatment led to that treatment, and the treatment caused new harm, the new harm belongs to the claim. That is settled and it is not controversial.

This covers more than a bad surgical outcome. A fall while on prescribed medication. A reaction to a drug. An infection acquired during treatment. A second injury sustained traveling to a required appointment. Nerve damage from a procedure. A frozen shoulder from immobilization.

The apportionment argument — this is the valuable part

Normally the carrier can reduce what it owes by attributing part of your disability to something else. That is apportionmentApportionment Dividing permanent disability between industrial and non-industrial causes. It is to disability, not to findings on an image., and it is the most common way case value is cut.

Hikida v. WCABWCAB Workers’ Compensation Appeals Board. The court system that decides these cases. 23 district offices statewide. (2017) held that where the employer’s medical treatment itself causes new permanent disabilityPD Permanent Disability. Compensation for lasting impairment. A different and much lower weekly rate — 2026 maximum $290/week., that disability is not subject to apportionment — the employer takes responsibility for the consequences of the treatment it provided. But Hikida was narrowed. County of Santa Clara v. WCAB (Justice) (2020) 49 Cal.App.5th 605 [85 Cal.Comp.Cases 467] holds that it “precludes apportionment only where the industrial medical treatment is the sole cause of the permanent disability.” Where pre-existing pathology also contributes, §§ 4663 and 4664 apportionment still applies.

So this is a real argument rather than an automatic answer. But it is a strong one, it is worth a great deal when it lands, and it is frequently not raised at all.

If your permanent disability was substantially caused by a failed surgery, and the carrier is apportioning your rating, that is a fight worth having. How apportionment works.

What decides it

The medical record has to connect the disability to the treatment. A physician needs to say, with reasoning, that the current impairment arises from the surgery or the complication rather than from the underlying condition.

Pre-operative baseline matters enormously. Range of motion, strength, and function documented before the surgery are what the post-operative findings get measured against. If nobody documented the baseline, get the records that show it anyway — physical therapy notes, prior QMEQME Qualified Medical Evaluator. A state-certified physician who resolves disputes. Unrepresented workers get a panel of three by random draw. reports, the surgeon’s own pre-op exam.

And the treatment has to have been for the industrial injury, which is usually obvious but occasionally is the whole dispute.

What not to do

Do not stop reporting symptoms because you are discouraged. A gap in the record after a failed surgery reads as improvement.

Do not accept “the surgery was successful” as the end of it. Successful in surgical terms and successful in functional terms are different things, and the AMA Guides rate function. A shoulder repair that healed perfectly and left you unable to reach overhead is a rating problem, not a medical success story. What the shoulder rules actually do.

And do not confuse this with malpractice. A separate malpractice case against the surgeon is sometimes available, and sometimes it is not — the interaction with the comp claim is genuinely complicated and it is worth specific advice rather than a general rule.