Hydroxyapatite and tricalcium phosphate-coated cups with and without screw fixation: a randomized study of 64 hips.

@article{Thanner2000HydroxyapatiteAT,
  title={Hydroxyapatite and tricalcium phosphate-coated cups with and without screw fixation: a randomized study of 64 hips.},
  author={Jonas Thanner and Johan N K{\"a}rrholm and Peter Herberts and Henrik Malchau},
  journal={The Journal of arthroplasty},
  year={2000},
  volume={15 4},
  pages={405-12}
}
Sixty-two patients (64 hips) were provided with porous press-fit cups (Trilogy), plasma-sprayed with a coating consisting of 70% hydroxyapatite and 30% tricalcium phosphate. The patients were randomized to a cup with cluster holes for adjunctive screw fixation (n = 30) or to a cup without holes (n = 34). Radiostereometry was used to study migration and wear. Up to 2 years median translations and rotations <0.2 mm and <0.2 degrees were recorded in the 2 groups, without any difference. The median… CONTINUE READING

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