You can prove tht the risk was increased. Depending upon the stats used to determine the variance between the implanted population and the non-implanted population, a significant risk can be asssumed to be the causative factor. And, if , in the other cases as you have cited, the physician insured that the vaccine was documented, then he is absolved of responsibility for other causative factors. He adhered to accepted standards of practice, and therefore cannot be held responsible for factors not under his control. However, it is under his control to insure that the patient is vaccinated prior to surgery.
