Pre-Existing Conditions and the “Eggshell Skull” Rule in Florida Injury Cases

“I already had a bad back.” “My knee was never right after college.” “I’ve had migraines for years.” People say these things to us as if they were confessions, and often they have already decided they have no case. They are wrong. Florida law has protected injured people with pre-existing conditions for more than a century, under a doctrine with a memorable name: the eggshell skull rule.

The rule, in plain terms

A defendant takes the victim as he finds him. If a careless driver rear-ends a 25-year-old athlete and a 60-year-old with degenerative disc disease, and the second person is hurt far worse by the same impact, the driver is responsible for the second person’s actual injuries, not for the injuries an average person would have suffered. Fragility is not a defense. The classic illustration is a person with a skull as thin as an eggshell: a tap that would not harm most people fractures it, and the person who delivered the tap is liable for the fracture.

Aggravation of a pre-existing condition

In practice, Florida juries are instructed on this principle through the concept of aggravation. If an accident makes an existing condition worse, accelerates it, or turns a dormant condition into a symptomatic one, the defendant is responsible for that worsening. Florida’s standard jury instructions go a step further: if the evidence does not allow the jury to separate the harm caused by the accident from the harm that existed before, the defendant is responsible for the entire condition. The burden of untangling it falls on the defense, not on you.

Why the insurance company raises it anyway

Adjusters raise pre-existing conditions because it works, not because it is a defense. Many claimants hear “we found your 2019 MRI” and give up. Others make the mistake the insurer is hoping for: they deny the old injury, the defense produces the records, and the case becomes about credibility instead of about the crash. The condition was never the problem. The denial is.

Honesty is the whole strategy

Be completely transparent with your doctors and your lawyer about your medical history.

• Do not say “I never had back pain before” if you did.
• Do say “I had occasional back pain that I managed with stretching. Since the crash the pain is constant, it shoots down my left leg, and I can’t sit for more than twenty minutes.”

That second sentence is the case. It identifies a baseline and a change, and the change is what you are owed.

How these cases are proven

• Prior records. Counterintuitively, your old records help. They establish how you were functioning before: working full time, no prescriptions, no imaging in years.
• Comparison imaging. A pre-accident MRI next to a post-accident MRI showing a new herniation, or a disc bulge that has become an extrusion, is powerful evidence.
• Treating physician testimony. Your doctor can explain, within a reasonable degree of medical probability, what the accident changed.
• Functional evidence. Before and after: hours worked, activities, medications, sleep.
• Witnesses. The people who saw you garden every weekend and have not seen you lift a bag of soil since.

The permanency threshold in car cases

One place pre-existing conditions genuinely matter is Florida’s no-fault threshold. To recover pain and suffering from an at-fault driver, you must prove a permanent injury within a reasonable degree of medical probability. The defense will argue that your permanent problem is the old one. The answer is the same: show the change. Aggravation of a condition that is now permanent satisfies the threshold.

Conditions that come up most often

Degenerative disc disease, prior herniations, arthritis, previous knee or shoulder surgery, old concussions, anxiety or depression, and prior work injuries. Every one of them is common, every one of them is manageable, and none of them disqualifies you.

Do not disqualify yourself

The person who decides whether you have a claim should be a lawyer who has read your records, not an adjuster who has read half of them. Call The Injury Advocates at (754) 812-8444 or 833-DARFOOR, or send us a message. The consultation is free, and you owe no fees or costs unless we recover for you. Learn how our personal injury lawyers handle cases involving prior injuries and aggravation claims.