One of the most common concerns victims have after an accident is whether a prior injury or medical condition will prevent them from bringing a successful claim.
Insurance companies often highlight past medical records and prior complaints in an effort to minimize or deny a claim but the reality under Wisconsin law is quite different. A prior injury does not automatically ruin your case. In fact, long-standing legal principles allow individuals to recover compensation even when an accident aggravates a pre-existing condition.
The “Eggshell Plaintiff” Rule in Wisconsin
Wisconsin follows a well-established legal doctrine often referred to as the “eggshell skull” or “eggshell plaintiff” rule. This rule provides that a negligent defendant must take the injured person as they find them, even if the person is more vulnerable to injury than the average individual.
The doctrine traces back to the landmark Wisconsin Supreme Court case Vosburg v. Putney (1891). In that case, a minor kick to a student’s shin aggravated a prior injury and caused severe complications. The court held that the defendant was responsible for the full extent of the harm, even though the severity of the injury was unforeseeable and related to the plaintiff’s prior condition.
The case established an enduring principle in tort law:
A defendant cannot escape liability simply because the injured person was more susceptible to harm. This rule continues to apply in modern Wisconsin personal injury cases.
Aggravation of a Pre-Existing Condition
Many injury claims involve not a completely new injury, but the aggravation or worsening of an existing medical condition. Wisconsin law allows recovery for damages caused by this aggravation.
For example, an accident may:
- Worsen a previously herniated disc
- Aggravate arthritis in a knee or shoulder
- Accelerate degenerative spinal conditions
- Trigger symptoms in a previously asymptomatic injury
In these situations, the defendant is responsible for the additional harm caused by the accident, even if the underlying condition already existed.
However, defendants are generally not liable for the natural progression of a condition that would have worsened anyway without the accident. Medical testimony is often used to separate accident-related aggravation from the underlying condition.
Why Insurance Companies Focus on Prior Injuries
Insurance carriers routinely request extensive medical histories because prior injuries can provide arguments to reduce the value of a claim. They may argue that:
- The symptoms pre-dated the accident
- The current condition is degenerative rather than traumatic
- The plaintiff was already experiencing similar pain
While these arguments are common, they do not automatically defeat a claim. Courts and juries are regularly asked to determine how much of a plaintiff’s condition was caused or worsened by the accident.
The Importance of Medical Evidence
When a plaintiff has prior injuries, medical records and expert opinions become particularly important. Physicians may be asked to address:
- Whether the accident caused a new injury
- Whether it aggravated or accelerated a prior condition
- The degree to which symptoms increased after the accident
- The likelihood that the condition would have worsened without the trauma
Clear medical documentation comparing pre-accident and post-accident conditions can be critical in proving damages.
Honesty About Prior Medical History
One of the biggest mistakes injury victims can make is failing to disclose prior injuries. Defense attorneys will usually obtain past medical records during litigation.
If prior conditions are hidden or minimized, it can damage credibility with the court or jury. By contrast, openly acknowledging prior injuries and explaining how the accident made them worse often strengthens a claim.
The Bottom Line
A prior injury or medical condition does not automatically destroy a personal injury case in Wisconsin. If an accident aggravates, accelerates, or worsens a pre-existing condition, the injured person may still recover compensation for the additional harm caused by the incident.
Because these cases often involve complex medical and legal issues, working with an experienced personal injury attorney can help ensure that the full impact of the accident is properly documented and presented.
