How Preexisting Injuries Affect a Maryland Personal Injury Claim: Aggravation, Causation, and Medical Evidence
Preexisting injuries or conditions can appear in prior records long before a Maryland personal injury claim begins. It may be arthritis, disc degeneration, a prior fracture, chronic pain, an earlier surgery, or an old accident. But the claim does not fail just because the condition existed first. The real issue is whether the new accident changed the condition, increased treatment, caused new symptoms, or reduced the client’s ability to work and function. That is where aggravation, causation, and medical evidence decide the value of the case.
Aggravation
Aggravation is the legal bridge between an old medical condition and a new injury claim. This section explains what counts as a preexisting injury, how an accident can worsen it, and why the claim must focus on the added harm instead of the entire medical history.
What Counts As A Preexisting Injury
A preexisting injury is any medical condition that existed before the accident. It may be a diagnosed injury, such as a herniated disc, torn ligament, prior fracture, concussion history, or surgical repair. It may also be a condition that appears in records but caused few symptoms before the new incident, such as arthritis, degeneration, stenosis, scar tissue, or old imaging findings.
Insurance companies often treat the phrase “preexisting condition” as if it ends the claim. It does not. A person can have a vulnerable spine, a prior knee injury, or old shoulder pain and still recover if the accident made the condition worse. Maryland cases recognize the general rule that the plaintiff has the burden of showing an aggravation of a preexisting condition. In Mayer v. North Arundel Hospital, the court discussed aggravation and apportionment when a later negligent act worsens an earlier injury.
How An Accident Can Aggravate An Old Condition
Aggravation means the accident changed the condition in a measurable way. The client may have had occasional pain before, then constant pain after. The client may have managed symptoms with home care before, then needed injections, therapy, surgery, or stronger medication after. The condition may have been stable before, then became disabling after the crash, fall, or other injury event.
Aggravation can appear through increased symptoms, new treatment, new restrictions, or a loss of function that did not exist before. Pain may become more frequent. Symptoms may radiate into the arm or leg. Imaging may show a new or worsened finding. The client may receive new work limitations or a surgical recommendation after the accident.
Why The Claim Is For The Worsening, Not The Entire Old Injury
A defendant is not automatically responsible for every medical problem the client had before the accident. The claim is for the added harm caused by the new incident. That may include increased pain, extra treatment, new limitations, missed work, future care, or loss of function that did not exist before.
Maryland law also recognizes that a defendant takes the plaintiff as the defendant finds them. In Peterson v. Goodyear Tire, Maryland’s highest court discussed the principle that the consequences of a physical injury may be more serious because of a person’s physical condition. That principle matters when a crash causes greater harm because the client was already medically vulnerable.
Aggravation is strongest when the evidence shows a clear medical change. The claim should not deny the old condition. It should prove what the accident added.
Causation
Causation is the link between the accident and the aggravated condition. This section explains why timing, accident mechanics, and prior medical records must work together before the insurer can be forced to treat the worsening as part of the claim.
Why The Timing Of Symptoms Matters
Causation links the accident to the worsening. Timing is often the first place the insurer looks. If the client reported pain immediately, went to the emergency room, followed up with a doctor, and described the same body part consistently, the claim is easier to prove. If treatment was delayed or symptoms changed over time, the medical explanation must be stronger.
A personal injury attorney in MD should compare the records before and after the accident. The file should show whether the client was treated regularly before the incident, whether symptoms were stable, whether the client had work restrictions before, and whether the accident created a clear change.
How The Type Of Accident Must Match The Injury
The accident must make medical sense. A rear-end car crash may aggravate a neck or back condition. A fall may worsen a knee, hip, wrist, shoulder, or spine injury. A side-impact collision may explain shoulder, rib, hip, knee, or head trauma. A twisting event may aggravate a disc, ligament, or joint condition.
The insurer may argue that the accident was too minor to cause the claimed injury. That is why the mechanism of injury matters. The legal file should connect the force of impact, body movement, seat position, fall direction, impact point, and immediate symptoms to the diagnosed condition.
For a Maryland car accident injury claim, crash evidence may include vehicle photographs, repair estimates, airbag deployment, seatbelt use, police records, witness accounts, emergency records, and imaging. The injury story should match the physical facts.
Why Prior Medical Records Can Help Prove What Changed
Old records are not always bad. They can help prove the claim when they show the client was stable before the accident. A prior MRI may show degeneration, but it may also show that the client did not have the new tear, new herniation, new symptoms, or new treatment needs before the incident. Prior records can also show the client had stopped treating, returned to work, or had no major restrictions before the accident.
The dangerous approach is hiding the old records. Insurers request prior medical history. Defense lawyers compare symptoms. Medical providers may mention old injuries in notes. A Maryland personal injury lawyer should control the issue directly by explaining what existed before, what changed after, and why the change matters.
Causation depends on consistency. The stronger the connection between the accident, the timing of symptoms, the mechanism of injury, and the medical record, the harder it is for an insurer to dismiss the claim as only an old condition.
Medical Evidence
Medical evidence gives the aggravation claim its structure. This section explains how the before-and-after record, provider opinions, imaging, treatment changes, restrictions, and daily limitations can separate an old medical condition from new legal harm.
The Before-And-After Medical History
A preexisting injury case is usually won or lost in the medical timeline. The timeline should start before the accident. It should show prior diagnosis, treatment, pain level, activity level, work status, medication, restrictions, and imaging. Then it should show what changed after the accident.
The most useful proof includes prior medical records, emergency records, primary care notes, specialist evaluations, therapy records, diagnostic imaging, work notes, disability forms, and activity restrictions. This evidence gives the claim structure. It prevents the insurer from using one old diagnosis to erase the new harm.
Doctor Opinions On What The Accident Changed
Medical records show treatment. Medical opinions explain causation. A treating doctor may need to say whether the accident aggravated the prior condition, accelerated symptoms, caused new injury, or made future treatment necessary. The opinion should identify the medical facts supporting that conclusion.
Maryland courts require reliable opinion testimony when medical causation is disputed. Maryland Rule 5-702 addresses expert testimony and requires that the witness be qualified, that the testimony be appropriate, and that the opinion has a sufficient factual basis. In Rochkind v. Stevenson, Maryland adopted the Daubert standard for expert testimony under Rule 5-702.
That means a doctor’s opinion should not be loose or automatic. It should explain the facts considered, the medical reasoning, and why the accident caused a change beyond the preexisting condition.
Imaging, Treatment Changes, Work Restrictions, And Daily Limitations
Imaging matters, but it is not the only proof. A person may have old degeneration on an MRI and still suffer a new aggravation. The question is whether the clinical picture changed. Did pain increase? Did symptoms move into the arm or leg? Did strength decrease? Did the client lose range of motion? Did the doctor order new treatment? Did work restrictions appear for the first time?
A strong file should connect medical findings with real-world limits. The client’s daily function may show what the records alone do not. Driving, lifting, sitting, standing, walking, sleeping, childcare, household tasks, and work duties may all show how the old condition became a new legal injury.
Medical evidence should answer the insurer’s main argument: what is different now? The answer must come from records, opinions, treatment changes, and functional limits.
Talk To A Maryland Personal Injury Lawyer Before The Insurance Company Blames Your Medical History
Preexisting injuries do not end a Maryland personal injury claim. The claim depends on proving what changed, why the accident caused that change, and what medical evidence supports the aggravation. If the insurance company is using an old injury, prior imaging, or past treatment to lower the value of your claim, speak with a Maryland personal injury lawyer before accepting that argument. Call (301) 259-5101 or contact us today to discuss whether your accident caused a compensable aggravation of a preexisting condition.