Final answer:
The correct position described is the Sims position, which is utilized in certain medical procedures.
Step-by-step explanation:
The position described, with the patient lying on her left side, her upper leg sharply flexed, and her lower arm behind her, is commonly known as Sims position. This position is often used during medical procedures or examinations, such as rectal exams or enemas. It allows for better access to the rectum and provides a more comfortable position for the patient. This position is particularly used in medical examinations and surgical procedures and is different from the supine position, where a person is lying on their back, or the prone position, where a person is lying face down. The Sims position is useful for various procedures including rectal exams, enemas, and in some cases, for patient comfort.