Results of 10 Years’ Follow-Up of Ceramic-Ceramic Couples in Total Hip Replacement
Coxarthrosis is not only observed in patients beyond the age of 70, but also more and more frequently in younger patients who are still gainfully employed. The rate of prevalence and incidence of coxarthrosis which can be treated surgically is 10 – 15% in patients aged between 35 and 85. Etiologically speaking, the majority of coxarthrosis in younger patients results from hip dysplasia, femoroacetabular impingement, necrosis of the femoral head or from Perthes disease. Since the average life expectancy of people in Central Europe is as high as 80 years, and since THR is needed by ever-younger patients, today’s implants must comply with increased requirements. The couples used in THR are required to last at least 20 years, provided they are perfectly suited for the application. The couples used most frequently today are metal-metal, metal-PE, ceramic-PE and ceramic-ceramic couples. According to the state of the art in research, the process of loosening of stems and acetabular cups is due to osteolysis which is caused by decomposition products. A revision rate of 7% or higher observed for metal-metal couples, and an abrasion rate of 0.1 mm per year observed for conventional metal-PE or ceramic-PE couples must be considered as critical. The benefit offered by ceramic-ceramic couples lies in their low abrasion rate of 0.001 mm per year . For this reason, such couples are especially suited for younger and active patients. Although there hasn’t been any age limit defined, it is recommended by specialists to restrict the use of ceramic-ceramic couples to patients below the age of 70.
KeywordsFemoral Head Femoroacetabular Impingement Perthes Disease Longterm Result Ectopic Ossification
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