The pain and severe wear of hip joints caused by osteoarthritis, rheumatoid arthritis, avascular necrosis and trauma can be subjected to total hip replacement (THR). A hip implant consists of 4 components: acetabular cup, femoral stem, articular liner and femoral head. As an ideal material for THR, ceramic possesses excellent biocompatibility and stability in the human bodies. Moreover, ceramic-on-ceramic interface is highly wear-resistant, preventing generation of wear particles. With the development of latest fourth-generation ceramic Delta, larger femoral heads can be manufactured to conform to the size of native femoral heads. The rate of some of the complications after THR, such as dislocation, can be significantly reduced. The purpose of the present study is to carry out a clinical follow up for each patient who has received the ceramic-on-ceramic THR in order to understand the clinical outcome. Furthermore, the possible complications, such as dislocation and squeaking, can be determined.

Inclusion criteria:

Patients who has received ceramic-on-ceramic total hip replacement after the year of 2013.

Exclusion criteria:

1. Patients who are unable or unwilling to return for follow-up
2. Patients who have deep periprosthetic joint infection
3. Patients who are diagnosed skeletal dysplasia
4. Patients who suffer from mental disorders

Patients who has received ceramic-on-ceramic total hip replacement after the year of 2013 at National Taiwan University Hospital Yunlin Branch.