Square Dimples Reduce Artificial Hip Rejection

May-17-18 Engraving artificial hips with square dimples could eliminate the need for follow up, replacement surgeries.

Artificial hips often need to be replaced when their lack of natural lubrication causes wear and triggers the body’s autoimmune response. To help reduce the need for replacement surgeries, the team from the University of Arkansas studies the effects of equipping the ball surface of the artificial femoral heads, which fits into the thigh bone, with dimples created by a picosecond laser.

The team experimented with square, triangular and elliptical shaped dimples meant to mimic the dimples of natural cartilage. In tests with simulated movement and synovial fluid, the square dimples helped generate a thick, lubricating film in less than one second, significantly reducing the risk of scratches and subsequent implant rejection.

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