735 ILCS 5/13-213 (c): Alteration, modification or change No product liability action based on any theory or doctrine to recover for
injury or damage claimed to have resulted from an alteration, modification, or change of the product unit
after the date of first sale, lease, or delivery of possession of the product unit to its
initial user, consumer, or other nonseller may be limited or barred by subsection (b) if the action is commenced within the applicable limitation period; and, in any event, within 10 years from the date the alteration, modification, or change was made, unless defendant expressly has warranted or promised the product for a
longer period and the action is brought within that period.
The Statute of Limitations is usually fairly clear cut in more common personal
injury cases such as slip and falls and car accidents, but can be altered if the incident occurred some time prior to the
initial discovery like in medical malpractice cases where the patients may not realize the damages until
long after the treatment plans commenced.