When the cure becomes the harm.
Patients place absolute trust in surgical teams. When that trust is broken by avoidable mistakes, the consequences can be permanent. Paul Cahill represents Ontario patients and families harmed by surgical negligence, from wrong-site procedures to retained foreign objects, anesthesia errors, and post-operative complications that should never have happened.
Surgery carries inherent risks, and Ontario law recognizes that. Even a flawlessly performed procedure can have unintended outcomes. That is not malpractice. Surgical negligence is something different: a deviation from the standard of care that a reasonably skilled surgeon would have provided in the same circumstances.
That deviation can take many forms. It can be a moment of distraction, a failure to verify, a shortcut taken under pressure, or a fundamental error in surgical technique. When it causes serious injury, lasting disability, or death, the law allows the patient or their family to seek accountability and compensation.
These are the situations Paul most commonly investigates. The presence of one of these patterns does not, by itself, prove malpractice, but it is often the starting point for a meaningful legal review.
Operating on the incorrect limb, organ, or side of the body. Modern surgical safety checklists are designed to prevent this entirely.
A patient consents to one operation but receives another, often due to chart confusion, communication breakdowns, or misidentification.
Sponges, instruments, or other items left inside the patient. These cause infection, perforation, and chronic pain, and require additional surgery to remove.
Improper dosing, intubation injuries, failure to monitor vitals, or anesthesia awareness during surgery. Errors here can cause brain injury or death.
Avoidable perforation, laceration, or nerve injury during a procedure. Often caused by surgical inattention, poor technique, or unfamiliarity with anatomy.
Sepsis or surgical site infections caused by inadequate sterilization, poor wound management, or failure to recognize and treat infection promptly.
Internal bleeding, leaks, blood clots, or compartment syndrome that go unmonitored or untreated after surgery, when prompt intervention could have prevented harm.
A patient must be informed of material risks, alternatives, and likely outcomes before consenting. Failure to disclose can ground a claim if the undisclosed risk materializes.
Three legal elements must be proven on a balance of probabilities. Each one requires expert medical evidence and careful documentation.
That the surgeon, anesthesiologist, or surgical team failed to do what a reasonably competent practitioner in the same specialty would have done in the same circumstances. This is established through expert testimony from a qualified peer.
That the breach in care actually caused the injury. The defence will often argue the harm was inevitable given the underlying condition. Causation evidence is what separates a credible claim from one that fails at trial.
That the injury produced compensable harm: medical costs, lost income, future care needs, pain and suffering, loss of enjoyment of life. Quantifying damages requires medical, economic, and rehabilitation expertise.
Surgical malpractice claims are among the most complex and well-defended in Canadian civil litigation. Knowing what you are up against is part of choosing the right counsel.
In Canada, doctors are defended by the Canadian Medical Protective Association (CMPA), which has substantial resources and a long-standing strategy of taking strong cases to trial. Hospitals are defended by HIROC, with similar capacity. Settlements are not freely offered.
Every meaningful claim requires expert medical opinion from a surgeon in the same specialty as the defendant. Securing these experts is difficult, expensive, and time-consuming. Many lawyers will decline cases that need this depth of investigation.
Operative reports, anesthesia records, nursing notes, pathology, post-op orders, and imaging must be obtained and analyzed line by line. Critical entries are often handwritten, abbreviated, or incomplete, requiring careful reconstruction of what actually happened in the OR.
Surgical care typically involves a surgeon, an anesthesiologist, a surgical assistant, OR nurses, and a hospital. Each may bear some responsibility, and each is separately represented. Pursuing the right defendants in the right proportions is part of the work.
Ontario's Limitations Act, 2002 generally requires civil claims to be commenced within two years of when the injury and its likely cause are discovered or should reasonably have been discovered. Evidence in surgical cases can be lost or degraded quickly. Earlier review preserves your options.
Surgical malpractice cases reward preparation, expert evidence, and a credible willingness to take the case to verdict. Paul is built for all three.
Jury award in a birth injury case demonstrating Paul's willingness and ability to take complex medical claims to trial.
Recognized by the Law Society of Ontario as a Certified Specialist in Civil Litigation, a designation held by a small fraction of Ontario lawyers.
Listed in Best Lawyers in Canada for Medical Negligence and Personal Injury Litigation, 2021 through 2026.
Retained as trial counsel by other Ontario lawyers on complex medical negligence files, a peer recognition of trial readiness.
Free, confidential consultations. Paul reviews every potential surgical malpractice case personally and tells you honestly whether it merits investigation. No pressure. No obligation.
Your information is confidential and reviewed only by Paul and his team.