There are four types of prosthetics, two concerning the arms and two concerning the legs.
The two prosthetics for the arms are transradial and transhumeral, and the difference between these two types is the level at which the amputation occurred. A transradial prosthetic replaces arms below the elbow, while the transhumeral prosthetic is applied when the amputation site is above the and thus contains an elbow joint.
The other two types of prosthetics, transtibial and transfemoral, are for the leg. A transtibial prosthetic attaches below the knee, and a transfemoral prosthetic sits above the knee and includes the knee joint.
There are various types of prosthetics, with the most variability involves the componentry. There are many different ways to suspend a prosthesis onto a limb. There are also many different prosthetic knees and feet available. For example, knee joints can be as simple as manual locking knee, which bends when the user sits and is locked when the user ambulates. But they can be as complex as a hydraulic knee that contains valves that adjust as a patient’s speed of ambulation changes allowing the prosthesis to “keep up with” the user through varying cadences.