Wallace v Kam

The High Court of Australia considered the appeal in *Wallace v Kam*. The dispute concerned the adequacy of warnings provided by a surgeon, Dr Wallace, to his patient, Mr Kam, regarding the risks associated with a particular surgical procedure. Mr Kam alleged that the warnings were insufficient, leading him to undergo surgery without fully appreciating the potential complications, which subsequently occurred.

The central legal issue before the High Court was whether the surgeon had breached his duty of care to inform Mr Kam of all material risks associated with the surgery. This involved determining what constitutes a "material risk" in the context of informed consent, and the standard by which the adequacy of a warning should be judged. The Court also had to consider the causal link between any alleged breach and the patient's decision to undergo the surgery.

The High Court affirmed the principles established in *Chappel v Hart*, holding that a medical practitioner has a duty to warn a patient of a risk if a reasonable person in the patient's position would attach significance to it. The Court clarified that the test for materiality is objective, focusing on what a reasonable patient would want to know, rather than the subjective beliefs of the particular patient. Furthermore, the Court reiterated that to establish causation, the patient must demonstrate that they would not have undergone the procedure had they been properly warned of the material risk.

The High Court found that the warnings provided by Dr Wallace were inadequate, as they failed to adequately convey the seriousness and likelihood of the specific risk that materialised. Consequently, the Court held that Dr Wallace had breached his duty of care. The appeal was dismissed, with the High Court upholding the decision of the lower courts in favour of Mr Kam.