For patients with amputation of an arm or leg who experience problems wearing a socket prosthesis, the prosthesis can also be anchored directly to the body. The surgeon places an orthopaedic implant directly into the bone of the stump. The prosthesis can be connected to this implant using a click system. This technique is called osseointegration, and the prosthesis is therefore called click prosthesis. Doctors use the term osseointegration prosthesis or bone-anchoring prosthesis. The skin opening through which the implant protrudes is called a stoma.