RADIOLOGICAL STUDY CONCERNING POSETOPERATIV MIGRATION OF THE SOCKET IN OUR CEMENTLESS TOTAL HIP SYSTEM

Abstract

Radiological examination regarding the influence on the fixation of the socket in the acetabulum by the congruity of the stem was carried out to 32 hips operated on with our total hip system on the average of three years after surgery. The ages of the patients were ranged from forty to eighty-one, on the average of sixty-three years old. All cases were divided into good and poor groups in the evaluation on the congruity between bone and stem.The degrees of the migration of the socket were not related to both groups, but influenced by the inserted angle into the acetabulum. In the group of good cpngruity of the stem to bone sockets moved to the varus position when inserted angles of the. soekets were not ideal such as over 40 degrees or under 30 degrees. In poor group migration of the socket was observed even if inserted angle was ideal such as around 35 degrees. The migration was started about one to three years after surgery. In order to prevent the migration of the socket it should be inserted into acetabulum with 35 degrees to the horizontal line and stem should be press-fitted to the intramedullary canal.