Lead Sponsor

General Hospital of Ningxia Medical University

Age

All ages

Sex

ALL

Healthy Volunteers

No

•DDH was diagnosed by clinical signs and imaging examination, and a primary THA was planned;
•the patient had persistent unilateral hip pain, which seriously affected their quality of life;
•the standard posterolateral approach was used;
•the contralateral hip was normal or had received THA;
•the proximal femoral Dorr classification was type A or B;
•The acetabular classification was Crowe type Ⅰ, Ⅱ, Ⅲ or IV;
•all patients were treated with the bioartificial hip joint PINNACLE® cup or SUMMIT® stem, developed by Johnson \& Johnson Biological.

•preoperative and postoperative imaging examinations did not meet the evaluation criteria (non-standard double-hip anteroposterior film, acetabular angle and LL length could not be accurately measured);
•severe osteoporosis, tumour or metabolic disease around the affected hip joint;
•spinal deformity by other causes or a history of lumbar internal fixation;
•external deformity of the affected hip joint in the lower extremity;
•neuromuscular insufficiency (with hip abduction weakness and poliomyelitis);
•severe disease with intolerance to surgery.