Implant Description

The current hip joint replacement prosthesis is composed of four major components:

  1. A metal socket that replaces the acetabulum

  2. A liner with highly polished inner part representing the articular surface. It is usually plastic but other materials are also used such as ceramic or metal. The liner allows the hip to move smoothly

  3. A metal stem that is inserted in the femoral canal

  4. A ceramic or metal ball (represents the femoral head), which articulates with the liner

There are two types of implants systems used for hip replacement:

  1. Cemented hip replacement system, which was first designed by Sir Charnley and is still currently used with some modifications 

  2. A biological non-cemented system, which depends on the body ingrowth or ongrowth on the metal surface