There are many types of implants a doctor can choose from when performing replacement surgery. There are usually many factors that are involved in making the choice as to which one to use. For example, the condition of the bones, the type of activity the patient does, what type of damage has been done, what implants are actually available, cost, and the doctor's experience with the implants.
Certain types of implants have advantages over others, depending on several things. If a patient wants to know more about the type of implant being used, it's best to speak with the surgeon and to ask questions about the implant, the surgery, and the reasons behind everything that is being done.