The Johansson classification of periprosthetic hip fractures was the first classification system proposed and is the simplest. It is based on the level of the fracture in relation to the prosthesis.
- type I: fracture proximal to the tip of the prosthesis with the stem still in contact with the medullary canal
- type II: fracture extends distal to the tip of the prosthesis, with dislodgement of the stem from the medullary canal of the distal fragment
- type III: fracture entirely distal to the tip of the prosthesis