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Hydroxyapatite augmentation of the porous coating improves fixation of tibial components

1998; British Editorial Society of Bone & Joint Surgery; Volume: 80-B; Issue: 3 Linguagem: Inglês

10.1302/0301-620x.80b3.0800417

2044-5377

Ingemar Önsten, Anders Nordqvist, Åke Carlsson, Jack Besjakov, Susan Shott,

Bone Tissue Engineering Materials

In a single-blind, randomised series of knee replacements in 116 patients, we used radiostereometric analysis (RSA) to measure micromotion in three types of tibial implant fixation for two years after knee replacement. We compared hydroxyapatite-augmented porous coating, porous coating, and cemented fixation of the same design of tibial component. At one to two years, porous-coated implants migrated at a statistically significantly higher rate than hydroxyapatite-augmented or cemented implants. There was no significant difference between hydroxyapatite-coated and cemented implants. We conclude that hydroxyapatite augmentation may offer a clinically relevant advantage over a simple porous coating for tibial component fixation, but is no better than cemented fixation.