21 Counsel for Mr Hammond sought to overcome this gaping hole in the evidence necessary to sustain the asserted duty by reference to the proposition that the issue was one of evaluation for the court, rather than an issue which had to be sustained by evidence, relying upon the principle in Rogers v Whitaker. While it is undoubtedly correct that the ultimate delineation of the duties of care imposed upon a medical practitioner is determined by the court, and not by standards of practice adopted within the medical profession, the decision of the court in a case such as this must be based upon evidence of risk, the consequences if the risk eventuates and the risks associated with any remedial procedure. Further, while evidence of practices adopted within the medical profession will not necessarily be determinative, it is, of course, relevant (Rosenberg v Percival [2001] HCA 18; (2001) 205 CLR 434, 439; Sheppard v Swan [2004] WASCA 215 at [41]). The failure of any of the expert witnesses to assert that they would have warned Mr Hammond of the risks of allowing the mesh to remain in place supports the conclusion of the trial judge. The failure of any of the experts to give evidence of the degree of risk associated with allowing the mesh to remain in place, which should have been assessed by a competent medical practitioner, having regard to Mr Hammond's condition and symptoms, and the degree of risk associated with surgery to remove the mesh in those circumstances, prevents the court from making its own evaluation of appropriate standards of care.