Animation link: http://photo.blog.sina.com.cn/category/u/1725050757/s/421881 The bipolar femoral head prosthesis is used in patients older than 75 years of age to treat femoral neck fractures. It has the advantages of a short operation time and the possibility of leaving the bed and moving around early after the operation. Since the small head of the artificial femoral head is rotated in the large head, while the large head in contact with the patient’s acetabular cartilage is basically not rotated, this design can reduce the wear and tear of the artificial femoral head on the acetabular cartilage and prolong the service life of the prosthesis.