Most adults who are seriously injured in a commercial truck collision were not in perfect health beforehand. Degenerative disc disease, prior orthopedic surgeries, arthritis, diabetes, depression, and a long list of other conditions are common in any random cross-section of the population. Defense counsel in trucking cases regularly raise these prior conditions as a basis to reduce damages. Georgia law addresses the question directly through the eggshell plaintiff doctrine, the rule on aggravation of pre-existing conditions, and the framework governing the burden of proof at trial.
The Eggshell Plaintiff Doctrine
Georgia follows the common law eggshell plaintiff rule, which provides that a negligent defendant takes the victim as found. A defendant whose conduct injures another cannot reduce liability by pointing to the fact that the plaintiff happened to be unusually vulnerable to injury. Georgia decisions describe the principle as requiring the defendant to bear the risk that liability will be increased by the actual physical condition of the person harmed.
The rule does not impose liability for the pre-existing condition itself. The defendant is responsible for the injuries actually caused, including any aggravation of an existing condition that resulted from the collision.
Aggravation of Pre-Existing Conditions
Closely linked to the eggshell plaintiff rule is the principle that a plaintiff may recover for any aggravation, acceleration, or worsening of a prior condition that the defendant’s negligence caused. Georgia case law consistently recognizes recovery for the difference between the plaintiff’s condition immediately before the collision and the plaintiff’s condition after. The Georgia Suggested Pattern Jury Instructions include charges that address aggravation, advising the jury that the defendant is liable for the worsening of an existing injury or condition caused by the defendant’s negligence.
If, for example, a plaintiff had asymptomatic disc degeneration before a collision and the collision precipitated symptomatic herniation requiring surgery, the value of the medical care, lost income, and pain and suffering associated with that symptomatic course is compensable. The fact that the underlying degenerative process predated the crash does not reduce the recovery.
Allocation by the Jury
When the evidence shows both pre-existing pathology and accident-related injury, the jury must allocate. Georgia courts handle this through jury instructions and through the burden of proof.
The plaintiff must prove that the collision caused the injuries claimed. Where injuries to a body part affected by a prior condition are at issue, the plaintiff typically presents medical testimony comparing the pre-collision and post-collision condition and describing how the collision contributed. The defense may present its own medical testimony or rely on cross-examination of the plaintiff’s experts to challenge the causation theory.
If the jury concludes that part of the disability or symptoms would have existed regardless of the collision, the jury may award damages only for the portion attributable to the collision. The eggshell plaintiff rule does not bar that allocation; it bars reduction based merely on susceptibility.
Burden of Proof and Apportionment
In some cases, the medical evidence does not permit a clean allocation between pre-existing and accident-related symptoms. Georgia case law addresses the burden of proof in such situations. If the defendant’s negligence caused indivisible injury combined with a pre-existing condition, and the evidence does not allow rational allocation, the defendant is generally responsible for the entire harm to the affected condition. The plaintiff still must prove a causal connection.
This rule is distinct from comparative fault and apportionment to non-party tortfeasors under OCGA Section 51-12-33, which addresses allocation of fault for the same injury among different defendants and non-parties.
Disclosure of Prior Medical History
Discovery in commercial truck cases routinely includes extensive medical history. Plaintiffs typically execute HIPAA-compliant authorizations for medical records covering relevant body systems and time periods, and the defense may take the depositions of prior treating providers. Defense counsel may also retain a medical expert to perform an independent medical examination under OCGA Section 9-11-35 if the plaintiff’s physical or mental condition is in controversy.
Concealment of prior medical history can be damaging at trial. Plaintiffs are expected to disclose prior treatment that bears on the injured body part or condition, including prior accidents, workers’ compensation claims, and surgeries. Failure to disclose may support cross-examination, impeachment, and in extreme cases jury instructions or sanctions.
Wrongful Death Cases
In wrongful death actions, the measure of damages is the full value of the life of the decedent under OCGA Sections 51-4-1 and 51-4-2. The decedent’s pre-existing conditions affect calculations of life expectancy and projected earning capacity, but they do not reduce damages on the theory that the decedent was vulnerable. Standard life expectancy tables in OCGA Section 24-14-44 and similar published mortality tables provide the starting point, and individualized testimony from treating physicians or expert witnesses can refine the projection.
Damages Components Affected
Different elements of damages may be analyzed differently when pre-existing conditions are present.
Past medical expenses incurred for treatment of accident-related symptoms are recoverable. Where the same provider treated a chronic condition both before and after the collision, billing is reviewed to separate accident-related care from ongoing baseline care.
Future medical expenses are projected based on the accident-attributable need. A plaintiff who would have needed knee replacement surgery in five years even without the collision may recover only for an accelerated timeline if the evidence shows that the collision moved the surgery up.
Lost wages and lost earning capacity are evaluated against the plaintiff’s actual pre-collision capacity, taking into account any limitations attributable to a pre-existing condition.
Pain and suffering and loss of enjoyment of life are evaluated by the jury based on the difference in the plaintiff’s condition before and after the collision. The jury may compensate for the increment caused by the defendant’s negligence.
Jury Charges
The Georgia Suggested Pattern Jury Instructions, Volume I, Civil Cases, include charges addressing pre-existing conditions and aggravation. The charges typically inform the jury that the defendant is liable for any aggravation of a pre-existing condition caused by the negligence, even if a person without that condition would have suffered less. They also instruct the jury that the defendant is not liable for the pre-existing condition itself, only for the worsening or new injury caused.
Expert Witnesses
Cases involving pre-existing conditions almost always require expert medical testimony to explain causation and apportionment. Treating physicians may testify about the patient’s history, presentation, diagnostic imaging, and the clinical reasoning that connects the collision to the current condition. Retained experts may offer opinions on biomechanics, the relationship between specific crash forces and observed injuries, and the natural history of the underlying condition.
Admissibility of expert testimony in Georgia is governed by OCGA Section 24-7-702, which incorporates standards drawn from Daubert v. Merrell Dow Pharmaceuticals, Inc., 509 U.S. 579 (1993). The trial court evaluates the qualifications of the expert, the reliability of the principles and methods used, and the application of those methods to the facts of the case. A retained defense expert who opines that the plaintiff’s symptoms are entirely attributable to a pre-existing condition must support that opinion with reliable methodology and a basis in the medical evidence.
Settlement Considerations
Pre-existing conditions affect settlement evaluation as well as trial outcome. Insurance carriers commonly request prior medical records before evaluating a demand, and the strength of the causation evidence influences negotiation positions. Cases with clean separation between pre-existing baseline and accident-caused worsening usually resolve more efficiently than cases in which the medical evidence does not support a clear allocation.
Disclaimer
This article is provided strictly for general educational and informational purposes. It is intended to explain how Georgia law works as a matter of public legal education, and it does not constitute legal advice, a legal opinion, or a recommendation about any particular course of action. Reading this article, or contacting the website on which it appears, does not create an attorney-client relationship between the reader and any law firm, attorney, or author.
The law changes over time. Statutes, regulations, court rules, and judicial decisions discussed here may have been amended, repealed, superseded, or reinterpreted after the date of publication, and citations to specific code sections or cases reflect the law only as it was understood when this article was written. The application of any legal principle also depends heavily on the specific facts and circumstances of an individual matter, and outcomes vary from case to case.
For these reasons, no one should rely on this article as a substitute for advice from a licensed Georgia attorney who can review the particular facts involved. The author and publisher make no warranty, express or implied, regarding the accuracy, completeness, timeliness, or applicability of the information provided, and disclaim any liability for any action taken or not taken based on this content.