This is a randomized controlled, multicenter study. According to the inclusion criteria, volunteers were recruited from patients undergoing total hip arthroplasty. After signing the informed consent, the subjects were assigned to the experimental group and the control group through the central randomization system. The researchers will complete the total hip arthroplasty for patients in the experimental group with the assistance of surgical navigation system. The patients in the control group do not use the surgical navigation system. The proportion of acetabular abduction angle and anteversion angle in the lewinnek safe area is the primary outcome measurement. The operation time, WOMAC score, Harris score, range of motion and dislocation rate are the secondaryoutcome measurements. The incidence of complications, devices and other adverse events were recorded.

Inclusion Criteria:

Clinical diagnosis of primary hip osteoarthritis(OA), fracture of femoral neck (FFN),or secondary hip osteoarthritis due to developmental dysplasia of the hip (DDH), hip avascular necrosis (AVN), rheumatoid arthritis (RA), ankylosing spondylitis (AS), and coxa plana

Exclusion Criteria:

Severe vascular diseases of the lower extremity Neuromuscular diseases Infectious diseases Severe dysfunctions of major organs Severe neurosensory deficiencies caused by spinal diseases Unable to receive CT/MRI scans