Does a Pre-Existing Condition Mean the Crash Didn't Hurt You?
One of the most common concerns patients have after a crash is learning that they already had arthritis, degeneration, a previous injury, or another pre-existing condition before the collision occurred.
Sometimes patients are told that these findings explain their symptoms. Sometimes they worry that a pre-existing condition means the crash did not really injure them.
Neither conclusion is necessarily correct.
In fact, many people with arthritis, degeneration, old injuries, or previous surgeries are functioning quite well before a crash. They are working, exercising, traveling, caring for their families, and living their normal lives.
Then the collision occurs.
The important question is often not what existed before the crash.
The important question is:
What changed after the crash?
What Is a Pre-Existing Condition?
A pre-existing condition is any medical condition that existed before the injury event.
Examples may include:
- Arthritis
- Degenerative disc disease
- Previous neck injuries
- Previous back injuries
- Prior surgeries
- Old fractures
- Chronic joint conditions
- Longstanding pain conditions
Many adults have at least some degree of degeneration or arthritis, particularly as they get older.
In some cases, patients do not even know these conditions exist until imaging studies are performed after a crash.
What Is a Predisposing Condition?
Some pre-existing conditions may also be considered predisposing conditions.
A predisposing condition is something that may make a person more vulnerable to injury or may make recovery more difficult.
For example, if two people experience the exact same collision, the person with a healthy spine may respond differently than the person who already has significant arthritis, degeneration, or a previous injury.
That does not mean the second person was not injured.
It may mean they had less reserve capacity before the collision occurred.
Why Pre-Existing Does Not Mean Uninjured
One of the biggest misconceptions in injury cases is that a pre-existing condition somehow proves that current symptoms are unrelated to the crash.
That is not how medicine works.
A person with arthritis can still be injured.
A person with a previous back problem can still sustain a new injury.
A person with degeneration can still experience a significant worsening of symptoms after a collision.
In many cases, a crash may aggravate a previously stable condition, making symptoms worse and reducing function.
That possibility must be carefully evaluated rather than simply dismissed.
The Goal Is to Compare You to Yourself
Many patients worry that they will be compared to a perfectly healthy person.
That is not the comparison that matters.
The important comparison is:
How were you functioning before the crash?
How are you functioning now?
Could you work before the crash?
Could you exercise?
Could you enjoy hobbies?
Could you perform daily activities without significant limitations?
If the answer to those questions changed after the collision, those changes may be medically important.
The goal is not to compare you to an ideal person.
The goal is to compare you to your own pre-crash condition.
Understanding the Eggshell Plaintiff Rule
Patients are sometimes surprised to learn that attorneys have a term for situations involving pre-existing conditions.
Lawyers often refer to the “eggshell plaintiff rule.”
While this is a legal concept rather than a medical diagnosis, the basic idea is that people are evaluated as they actually are, not as perfectly healthy individuals.
In simple terms, a person who causes a collision does not get to avoid responsibility simply because the injured person was more vulnerable than someone else.
If someone had arthritis, degeneration, a prior injury, or another condition before the crash, that does not automatically mean they cannot be injured.
In many situations, those pre-existing conditions may actually help explain why the person was affected more severely or why recovery takes longer.
Why Your Doctor Needs to Know About Prior Injuries
Some patients are hesitant to discuss previous injuries or prior treatment because they worry it will hurt their case.
In reality, understanding a patient’s history is often essential.
Knowing what existed before the crash helps a doctor:
- Establish a baseline condition
- Understand what symptoms changed after the collision
- Identify aggravation of pre-existing conditions
- Make a more accurate diagnosis
- Develop realistic treatment goals
- Evaluate recovery progress
- Determine when Maximum Medical Improvement has been reached
The more accurately a doctor understands the patient’s condition before the crash, the more accurately the effects of the crash can be evaluated.
Why Recovery May Take Longer
Not every patient starts from the same place.
Someone with significant arthritis, degeneration, prior surgeries, or previous injuries may have a more difficult recovery than someone with no underlying conditions.
That does not mean treatment is failing.
It may simply mean the patient’s body had additional challenges before the collision ever occurred.
These patients often require more careful evaluation, more individualized treatment planning, and more realistic recovery expectations.
Understanding this helps explain why some people recover quickly while others continue experiencing symptoms long after the injury event.
Why Pre-Crash Status Matters
One of the most important medical-legal questions in an injury case is:
What was the patient’s condition before the crash?
The purpose of treatment is not necessarily to make someone better than they were before the collision occurred.
Rather, the goal is often to help the patient recover as much function as possible and return to their pre-crash level of health and activity.
That is why establishing an accurate baseline is so important.
Without understanding where a patient started, it becomes much harder to determine what changed, what treatment is appropriate, when recovery has plateaued, and whether the patient has returned to their pre-crash status.
Why Documentation Matters
A thorough crash evaluation should document not only the injuries that occurred after the collision, but also the patient’s condition before the collision.
Good documentation helps explain:
- What symptoms existed before the crash
- What symptoms developed afterward
- What changed
- What functional limitations developed
- Whether a pre-existing condition was aggravated
- How the patient's recovery is progressing
This information helps create a clear picture of how the collision affected the patient and what recovery should reasonably look like moving forward.
Conclusion
Having arthritis, degeneration, a prior injury, or another pre-existing condition does not automatically mean the crash did not hurt you.
In fact, pre-existing conditions may sometimes help explain why a person was more vulnerable to injury or why recovery takes longer than expected.
The important question is not simply what existed before the crash.
The important question is what changed because of the crash.
A thorough evaluation should consider both your pre-crash condition and your post-crash symptoms to develop an accurate diagnosis, realistic treatment plan, and appropriate recovery goals.
If you have been injured in a crash, Billings Chiropractic Injury Clinic can help evaluate your injuries, document your condition, and guide you through the recovery process.
About the Author
Dr. Jeff Mitchell, DC, CICE
Dr. Mitchell is a speaker, coach, researcher, and treating physician for victims of car crashes. At Billings Chiropractic Injury Clinic, he’s dedicated his 20+ year career to helping people heal fully, not just “patch the pain.”
