Final answer:
Physicians are not obligated to provide treatment that may cause unnecessary harm to patients within the context of an implied contract.
Step-by-step explanation:
While practicing within the context of an implied contract with a patient, the physician is not obligated to provide treatment that may cause harm to the patient unnecessarily. This is in accordance with the principle of nonmaleficence, which states that healthcare providers should act in ways that do not cause harm to others. Nonmaleficence requires physicians to carefully consider the potential harms of any procedure, treatment, or test and only subject patients to those that are necessary for effective treatment.