• Joint 

Joint Prosthetics are commonly used to replace damaged joints because of worn down cartilage. The hip, knee and shoulder joints are commonly replaced with prosthetics because these are the most comonly used joints. The hip and shoulder are ball and socket joints, which when replaced round ball implant is attached to a stem that is inserted into the thigh bone or upper arm bone then a plastic-lined socket is attached to the pelvis or shoulder blade to form a new joint functioning just like any normal joint would. In the knee prosthetic implants replace the bottom of the thigh bone, the top of the tibia, and the large lower leg bone. 

• Arm

Arm prostheses are used to replace a missing limb eiither below the elbow or an entire arm. The main types of arm prostheses are categorized as transradial or transhumeral. Transradial prosthetics attach below the elbow, normally used when someone only loses half an arm such as a burn victim or one in a car accident. Transhumeral prosthetics attach to the upper arm when the elbow joint is missing, normally when losing an entire arm. Body-powered arm prosthetics attach to the body with a harness and cable. The artificial arm is controlled by movement of the opposite arm and the muscle signals sent to the prostetic.

• Leg 

Two types of prostheses transtibial and transfemoral are used to replace a missing leg from any accident such as a car accident or a retired militry bomb victim. Transtibial prosthetics are used to replace parts missing below the knee but they can not help anything that is above. Transfemoral prosthetics include an artificial knee joint and attach to the thigh, these are mainly for those who have lost an entire leg. 

• Cosmetic

Cosmetic prostheses do not improve function but are used to improve a person's appearance after the loss of a body part which may consist of eyes, hands, fingers, a foot, or toes.