How Accurate Apportionment Analysis Can Reduce Your Claim Exposure

Not every orthopedic finding on an MRI is caused by a work injury. Degenerative changes—disc desiccation, rotator cuff tendinosis, osteoarthritis—accumulate over a lifetime and are frequently present before an injury ever occurs. Distinguishing what portion of a claimant's condition is attributable to the work event versus pre-existing degeneration is one of the most valuable services an orthopedic IME can provide, and one of the most commonly underutilized.

The Apportionment Problem

Claims are often evaluated—and paid—as if the entirety of a claimant's condition resulted from the reported injury. Without a clear apportionment analysis, carriers may end up compensating for degenerative conditions that predate the claim, sometimes significantly inflating exposure on both medical treatment and permanent disability ratings.

What Proper Apportionment Analysis Looks Like

A thorough apportionment opinion requires more than a passing mention that "some degenerative changes are present." It requires:

Correlation of imaging with age-appropriate norms: Comparing findings to what would be expected in an asymptomatic individual of the same age.

Review of prior medical history: Identifying any documented complaints, treatment, or diagnostic imaging predating the injury.

Mechanism of injury analysis: Assessing whether the reported mechanism is consistent with an acute structural injury or more consistent with an aggravation of an underlying condition.

Percentage-based apportionment where supported: Providing a defensible, literature-supported breakdown between pre-existing and injury-related impairment, rather than an all-or-nothing conclusion.

Case Example

Consider a claimant with a rotator cuff tear following a reported lifting injury. Imaging reveals significant tendinosis and a partial-thickness tear pattern more consistent with chronic degenerative change than an acute traumatic event. A thorough IME identifies this distinction, reviews prior treatment records showing similar complaints two years before the claimed injury, and provides a reasoned apportionment opinion: 70% pre-existing degenerative condition, 30% aggravation related to the work event.

This kind of analysis doesn't eliminate the claim—the aggravation is real and compensable—but it provides a defensible basis for limiting exposure to the portion actually attributable to the work injury, rather than the claimant's full degenerative condition.

Why This Matters for Claims Strategy

Apportionment analysis done well:

Provides a defensible basis for reducing permanent disability ratings

Supports negotiated settlements grounded in objective medical evidence

Reduces the likelihood of paying for treatment unrelated to the compensable injury

Withstands scrutiny in litigation because it's grounded in documented history and accepted medical standards, not speculation

The Cost of Skipping This Step

Carriers that rely on IME opinions without a clear apportionment analysis often end up litigating causation issues later—at higher cost and with less favorable timing—than if the distinction had been established early in the claim.

About Romanelli Orthopedic Forensics (RIME)

Dr. Daniel Romanelli provides detailed causation and apportionment analysis for orthopedic claims, helping carriers and defense counsel establish a defensible, evidence-based basis for claim valuation and litigation strategy.

To schedule an appointment with Dr. Romanelli, contact us today.