Unity Bayer ex rel. Petrucelli v. Dobbins
885 N.W.2d 173
Wis. Ct. App.2016Background
- During a vacuum-assisted vaginal delivery complicated by shoulder dystocia, newborn Unity Bayer sustained a permanent right brachial plexus injury; plaintiffs sued the delivering physician, Dobbins, alleging excessive traction.
- Dobbins defended by asserting Unity's injury was caused by maternal (endogenous) forces of labor, not clinician-applied traction, and disclosed obstetric, neurology, and biomechanical experts (including Dr. Grimm) relying on peer‑reviewed literature and computer modeling.
- Plaintiffs moved in limine under Wis. Stat. § 907.02(1) / Daubert to exclude all expert testimony that maternal forces caused a permanent brachial plexus injury, arguing the literature is unreliable and fails to show maternal forces produce permanent (versus transient) injuries.
- The circuit court granted the motion, reasoning the cited literature did not distinguish permanent from temporary injuries and barring experts from relying on or even using that literature to form opinions — effectively precluding the maternal forces defense.
- On interlocutory appeal, the court of appeals reviewed under the erroneous-exercise-of-discretion standard and concluded the circuit court abused its gatekeeping role by excluding the proffered expert testimony; it reversed and remanded.
Issues
| Issue | Plaintiff's Argument (Bayer) | Defendant's Argument (Dobbins) | Held |
|---|---|---|---|
| Whether expert testimony that maternal forces of labor can cause Unity's permanent brachial plexus injury is admissible under Wis. Stat. § 907.02(1)/Daubert | The literature is unreliable, often addresses only transient injuries, and experts cannot identify the specific force or timing — so testimony should be excluded | A substantial body of peer‑reviewed literature (including the ACOG review) and biomechanical modeling supports maternal forces as a plausible cause of permanent injury; experts are qualified and methodology reliable | Reversed: exclusion was an erroneous exercise of discretion. The court should have admitted the proffered expert testimony; disputes go to weight, not admissibility |
Key Cases Cited
- Daubert v. Merrell Dow Pharm., 509 U.S. 579 (1993) (trial court must gate‑keep expert evidence based on reliability and relevance)
- General Elec. Co. v. Joiner, 522 U.S. 136 (1997) (courts may exclude expert opinions with too great an analytical gap from the data)
- Kumho Tire Co. v. Carmichael, 526 U.S. 137 (1999) (Daubert gatekeeping applies to all expert testimony, not only scientific)
- State v. Giese, 356 Wis. 2d 796 (Ct. App. 2014) (Wisconsin standard applying Daubert factors for expert admissibility)
- Estate of Ford v. Eicher, 250 P.3d 262 (Colo. 2011) (maternal‑forces expert testimony admissible; inability to ethically test theory goes to weight, not admissibility)