Analysis of the failure of 122 polyethylene inserts from uncemented tibial knee components.

摘要: The extent of wear retrieved, polyethylene tibial components appears to be related design. To test this observation, 122 inserts were graded for wear, and new several designs tested contact stress using Fuji film. Finite element analysis provided insight into subsurface stresses. Significant was seen in 61.5% the examined. presence unconsolidated polymer powder 44% found statistically correlated with severe articulating surface. Contact noncongruent exceed yield strength polyethylene. There a positive correlation between intensity level stress, having greater than fully congruent geometries. In designs, thinner showed thicker same