Louis Gareis v. 3M Company, 9 F.4th 812

Background

Louis and Lillian Gareis sued 3M and Arizant as part of the Bair Hugger MDL, alleging a Bair Hugger warming device used during Louis’s hip-replacement caused a periprosthetic joint infection (PJI).
The Gareises asserted multiple state-law claims including strict-liability design-defect and failure-to-warn (negligence and strict-liability theories).
The district court (applying South Carolina law) granted 3M summary judgment on the failure-to-warn claims (concluding 3M lacked sufficient actual or constructive knowledge to owe a duty), but allowed the design-defect claim to proceed to trial.
At trial the court excluded evidence of 3M’s knowledge at the time the device left its control and excluded most alternative-design evidence (permitting only evidence about a TableGard device), but admitted 3M’s expert Dr. Abraham to testify about operating-room airflow via a CFD model.
A jury returned a special verdict for 3M, finding the Gareises failed to prove (1) the Bair Hugger was defectively unreasonably dangerous/that a reasonable safer alternative existed, and (2) that the Bair Hugger caused Louis’s PJI; the district court denied a new trial.
The Gareises appealed the evidentiary rulings and the summary-judgment dismissal of their failure-to-warn claims; the Eighth Circuit affirmed.

Issues

Issue	Plaintiff's Argument	Defendant's Argument	Held
Exclusion of evidence of 3M’s knowledge and exclusion of most alternative-design evidence	The excluded evidence was relevant to the risk-utility and alternative-design elements of the strict-liability design-defect claim	Evidence was properly excluded; any exclusion was harmless/no prejudice	No abuse of discretion shown; even if erroneous, Gareises failed to show prejudice given the jury’s verdict on causation and abundant alternative-causation evidence
Admission of Dr. Abraham’s CFD/airflow testimony despite allegedly inadequate Rule 26 disclosure	Abraham’s testimony was undisclosed and therefore inadmissible under Rule 26/37	Any disclosure failure was harmless; testimony was admissible to rebut causation theory	No reversible error: district court did not abuse discretion; Gareises failed to show the testimony had substantial influence given other record evidence
Grant of summary judgment on failure-to-warn claims (duty based on actual or constructive knowledge)	There was a genuine dispute of material fact about 3M’s actual or constructive knowledge so summary judgment was improper	3M lacked sufficient knowledge to trigger a duty to warn; summary judgment appropriate	Affirmed, but on alternative ground: even if summary judgment were erroneous, the jury’s verdict that Bair Hugger did not cause the PJI makes the prior grant harmless
Harmlessness of any evidentiary or summary-judgment errors	Excluded/admitted evidence prejudiced outcome and requires reversal/new trial	Any errors were harmless in light of the jury’s findings and substantial alternative-causation evidence	Harmless error doctrine applied; no reasonable assurance jury would have decided differently, so affirmance warranted

Key Cases Cited

Hirchak v. W.W. Grainger, Inc., 980 F.3d 605 (8th Cir. 2020) (federal law governs evidentiary issues in diversity/MDL contexts)
Hutcherson v. Progressive Corp., 984 F.2d 1152 (11th Cir. 1993) (federal law governs review of summary-judgment procedure)
Madden v. Cox, 328 S.E.2d 108 (S.C. Ct. App. 1985) (elements of strict-liability design-defect)
Newbern v. Ford Motor Co., 833 S.E.2d 861 (S.C. Ct. App. 2019) (risk-utility test for design defect)
Bragg v. Hi-Ranger, Inc., 462 S.E.2d 321 (S.C. Ct. App. 1995) (risk-utility balancing described)
Branham v. Ford Motor Co., 701 S.E.2d 5 (S.C. 2010) (reasonable alternative design required to show unreasonably dangerous design)
McKnight ex rel. Ludwig v. Johnson Controls, Inc., 36 F.3d 1396 (8th Cir. 1994) (trial reversal for improperly admitted expert testimony requires showing it had substantial influence)
Vogt v. State Farm Life Ins., 963 F.3d 753 (8th Cir. 2020) (abuse-of-discretion standard for evidentiary rulings)
Cavataio v. City of Bella Villa, 570 F.3d 1015 (8th Cir. 2009) (erroneous summary judgment may be harmless when trial verdict would have resolved the claim against the plaintiff)
Wing v. Britton, 748 F.2d 494 (8th Cir. 1984) (harmlessness of erroneous summary judgment where later trial verdict disposes of the issue)