Hip arthroplasty is a kind of joint reconstruction surgery, which has been successfully utilized for treatment of osteoarthritis or hip fracture for decades. In this surgery, implants is applied to reconstruct hip joint, and usually comprised of four components, including femoral stem, femoral head, acetabular cup and liner.

Visual Analogue Scale (VAS) is a patient-reported outcome measure. Scale from 0 to 10 stands for no pain to extreme pain.

Harris Hip Score (HHS) assesses the results of hip replacement. the domains cover pain, function, absence of deformity and range of motion. The maximum score of HHS is 100, and the higher score participants get, the less dysfunction they have.

Oxford Hip Score (OHS) is a patient-reported outcome measure with 12 questions related to the condition of function and pain. Total scores is from 0 to 48, higher scores represent a better outcome.

Forgotten Joint Score (FJS-12) is a patient-reported questionnaire with 12 questions, assessing the ability of the patient to forget the affected joints during daily activities. The higher the scores, the better the outcome.

X-ray imaging will be applied to examine the stability of implants, such as radiolucent line and loosening. The width of radiolucent line around implant suggest the possibility of implant loosening; generally, the wider the width is, the higher risk of loosening.