Ceramic Stripe Wear

We analyzed 16 retrieved bearings.

Ceramic stripe wear.

Alumina ceramic on ceramic bearings have very low wear rates in standard hip simulators. The average wear volume was 0 4 mm3 year in the femoral heads. However retrieved bearings demonstrate edge loading wear. Retrieved heads from ceramic on ceramic bearing couples sometimes have a long narrow area of damage which has been called stripe wear.

Designed for extreme wear resistance this kevlar filled nylon 6 6 material lasts up to 20 times longer than unfilled nylon. This pattern is only seen in the early stages of ceramic on ceramic wear as a result of line contact between the head and the edge of the liner. Ceramic strips were also offered as components for sale. Ceramic on ceramic coc articulations were developed as an alternative bearing to conventional metal on polyethylene mop bearings in order to decrease bearing surface wear and hopefully increase.

I think of it as a basic classic pattern. Ceramic strips continued to be used on some 7000 series instruments until the mid 1970s and plug ins until the early 1990s. This is a preview of subscription content log in to check access. Since no cup coating was found in these early generations of ceramic bearings component migration was common.

Stripe wear has been reported in many ceramic on ceramic hip replacement retrievals and microseparation separation of the femoral head from the acetabular cup has been proposed as one suggested. Stripe wear regions are distinguished by large numbers of ceramic grains having been removed from the ceramic matrix leaving a surface that is very rough with faceted pits fig. Click on the image to view the pdf. I love a retro striped tee.

Stripe wear has been reported for first and second generation ceramic bearing and initially was associated with steep cup angles revision surgery and young patients 54. Factors causing stripe wear including obesity and cup malpositioning also involve increased risk of ceramic liner fracture and merit heightened concern. Will you wear horizontal stripes in the future.