[Experimental and clinical researches regarding the socket with three spikes of cementless total hip system].
Experimental and clinical studies were performed to develop the ideal design and operative procedures of the socket with three spikes in cementless total hip replacement. To improve the socket in our original system the new one (Y type) based on the thickness of the acetabulum determined by the special radiographic method was developed. Computer simulation using a rigid body spring model was also carried out to determine the ideal placement of the socket under surgical procedure. Radiological follow-up studies were conducted on 53 clinical cases receiving our total hip system. The present results showed that the Y type, in which each of spikes was shifted 1 mm to the peripheral side as compared to the original type and the short spikes were shortened to 20 mm, was more stable than the original type. The ideal angle of insertion for the socket was 35 degrees to the horizontal line. In cases with acetabular hypoplasia, bone grafting was necessary.
Tatsugi
S
S
Department of Orthopaedic Surgery, Yamanashi Medical College, Japan.
D000077:Acetabulum / Q000033:anatomy & histology; D000368:Aged; D000369:Aged, 80 and over; D001696:Biomechanical Phenomena; D003198:Computer Simulation; D005069:Evaluation Studies as Topic; D005260:Female; D005500:Follow-Up Studies; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000503:physiopathology / Q000601:surgery*; D011474:Prosthesis Design