الفهرس 
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Abstract
Ceramic-on-ceramic hip joints have good tribological results: low friction, good lubrication and very low wear in vitro and in vivo, so giving greater implant longevity which equals better quality of life.
Ceramic particles are biologically inert.The ceramic total hip joints should have the lowest risk of loosening and failure. Also, the fracture risk is relatively low. With good implant positioning these joints have the potential to perform incredibly well. These bearings, therefore, deserve to be high on the list for both primary and revision implants, especially for the younger, more active patient.
The most important complication about COC bearings are squeaking, and component impingement and micro-separation, increasing the risk of surface damage and premature prosthetic failure. Alumina head or socket fracture is the most frequent causes of failure in ceramic arthroplasty.The newest alumina/composite ceramic bearing surfaces have numerous properties that make it an ideal bearing surface in hip replacements, most notably its high density, strength, scratch resistance, wear resistance and smooth surface finish which is superior to a metallic finish. Only negligible risk for fracture of the head and liner, and exhibit very low wear rates. The precise mechanics behind the production of sound by a squeaking hip replacement remains unknown. Though squeaking is a multifactorial phenomenon, certain factors such as component position are within the surgeon’s control.
The most common cause for revision is aseptic loosening. Registry data suggests up to 75% of revision surgery may be due to aseptic loosening. Infection is one of the most feared complications. Rates with prophylactic measures such as antibiotics and clean air enclosures have however dropped significantly to below 1%.