Background
Eva Dworakowski underwent hip replacement surgery performed by Dr. Michael S. Sisk on August 11, 2020, to treat osteoarthritis and trochanteric bursitis. During the procedure, her greater trochanter (a bony prominence on the upper femur) fractured. Dr. Sisk repaired it intraoperatively and completed the replacement. At a follow-up visit on August 25, 2020, x-rays showed proper alignment and intact hardware.
Three days later, Dworakowski’s hip dislocated and required emergency care. Dr. Sisk performed revision surgery on September 1, 2020. Despite continued pain management and a third surgery by a different surgeon (Dr. Howarth) in December 2020, Dworakowski continued to experience complications. She sued Dr. Sisk for negligence, claiming he had been negligent during the original surgery and in his post-operative care. A jury returned a verdict in Dr. Sisk’s favor, and Dworakowski appealed.
The Court’s Holding
The Colorado Court of Appeals affirmed the judgment for Dr. Sisk, rejecting Dworakowski’s four principal arguments on appeal. First, the court upheld exclusion of expert testimony regarding the August 25 x-ray and office note because Dworakowski’s expert had not specifically disclosed opinions about these materials in his required expert report, failing to provide Dr. Sisk with reasonable notice under Colorado Rules of Civil Procedure 26. While the report generally referenced reviewed materials and attached images, it made no mention of the August 25 x-ray, office note, or visit.
Second, the court found any error in precluding cross-examination about Dr. Sisk’s declaration (prepared years after surgery, describing his use of a “figure eight” repair technique not mentioned in his contemporaneous surgical report) was harmless. Dworakowski’s counsel had extensively questioned Dr. Sisk about discrepancies between the original report and the later declaration, and the court allowed the jury to draw inferences in closing argument—affording adequate opportunity to undermine the expert’s credibility.
Third, the court excluded evidence of a pending hip-replacement malpractice case, a 2012 disciplinary letter regarding knee surgery, and Dr. Sisk’s resignation of surgical privileges. The pending case had minimal probative value with no liability finding; the disciplinary letter was irrelevant (different procedure, eight years old); and the resignation could not be connected to Dworakowski’s procedure. Finally, the court properly limited closing argument to bar unsupported claims that Dr. Sisk’s communications were negligent and lay interpretation of medical imaging without expert testimony.
Key Takeaways
- Expert disclosures must specifically identify opinions and supporting materials; vague references to “medical records” do not satisfy Colorado Rule 26(a)(2)(B) requirements, and opposing counsel must receive reasonable notice of specific opinions.
- Evidence of pending litigation against a professional defendant carries minimal probative value for impeachment when liability has not yet been established and cannot support credibility attacks under Colorado Rules of Evidence 401 and 403.
- Prior disciplinary actions or unrelated professional matters are inadmissible impeachment evidence when they involve different procedures or practices and predate the incident at issue by years.
- Closing argument is limited to facts in evidence and reasonable inferences; counsel cannot offer lay interpretation of medical imaging or argue negligence regarding communications unsupported by expert or documentary evidence.
Why It Matters
This decision reinforces Colorado’s strict requirements for expert witness disclosure in civil litigation. Parties cannot rely on vague references to “medical records” or broad categories of reviewed materials; they must specifically identify opinions and their bases to satisfy notice requirements and avoid sanctions under C.R.C.P. 37. Trial courts have substantial discretion to exclude undisclosed expert opinions, placing significant burdens on plaintiffs’ counsel to ensure detailed compliance with disclosure rules.
The decision also signals caution about using pending litigation for impeachment purposes. Unlike settled or adjudicated prior cases, ongoing lawsuits without liability findings lack probative value for credibility attacks and risk unfair prejudice and jury confusion. Additionally, the ruling clarifies limits on closing argument rhetoric in medical malpractice cases—counsel cannot reframe factual disputes as negligence without evidentiary support, and lay interpretations of medical imaging require expert foundation. These holdings are particularly significant in medical malpractice practice, where expert disclosure compliance and scope-of-argument boundaries significantly shape trial strategy and outcomes.