抄録
We describe a case of cup breakage in a ceramic-on-ceramic total hip arthroplasty at 3 years postoperatively. In 1999, a 68-year-old woman recieved a left cementless total hip arthroplasty for osteoarthritis, using a ceramic-on-ceramic prosthesis (Kyocera ABS cup, alumina ball) . In May, 2002, she noted a left groin creak which progressively increased. A radiograph of the pelvis revealed displacement of the cup liner, and a revisional operation was performed in August, 2002. Analysis of retrieved implants suggested that increased friction on the alumina bearing surface, possibly due to undetermined interposition, resulted in increased torque, and subsequently the liner was sheared off the metal shell. Since there have been increasing ABS cup failures, careful follow-up of operated patients is needed for early detection of breakage.
