The duty to warn recognised in Rogers v Whitaker is a duty to warn of risks inherent in a proposed surgical procedure to enable informed consent; it does not extend to a duty to delegate to the patient responsibility for deciding the course to be followed when contingencies arise during surgery. A duty to warn of risks of maintaining a surgical appliance in place requires evidence of appreciable adverse risk, and the failure of expert witnesses to assert such a warning obligation or to give evidence of the degree of risk prevents the court from making its own evaluation of appropriate standards of care. Failure to put the relevant propositions to the treating surgeon in cross-examination precludes reliance on those propositions on appeal.
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