acetabulum coated with sprayed-HA-coating for optimised and improved osseointegration

Plasma Sprayed HA Coatings


DOT applies the plasma sprayed HA coating to the implants in a vacuum chamber using the VPS vacuum technique.

Plasma-sprayed-HA-coatings - PDF: 600 KB

Range of Application
  • Joint implants: hip joint, knee joint, ankle joint, shoulder joint, wrist joint, finger implants and spinal implants
plasma sprayed HA coating on a hip stem
Advantages of the Procedure
  • Surface enlargement
  • High primary stability of the implant due to rough surface
  • Long-time stability due to bone ingrowth into the porous HA layer
  • Improved fatigue strength of the implants compared with sintering techniques
  • Application of VPS technique leads to increased purity and adhesive strength in comparison to other methods (e.g. APS - Atmospheric Plasma Spray)
  • Color: light gray/white
  • Coating thickness: 20–200 µm
  • Roughness Ra: 5–13 µm
  • Porosity: 10–20 %
  • Adhesion strength: ≥ 15 MPa
  • Ca/P ratio: 1.61–1.76
  • Porous, crystalline surface
  • Degree of HA crystalline phase: ≥ 45 %
  • Very good biocompatibility
  • Phase composition:
    • HA ≥ 50 w% *1
    • a-TCP, ß-TCP, TTCP ≤ 30 w% *2
    • CaO ≤ 5 w% *2
*1 Relative to the total mass of the coating
*2 Mass ratio of the foreign phases relative to the mass ratio of the crystalline HA
SEM pictures of the HA sprayed surface
SEM pictures of the HA sprayed surface


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18059 Rostock l Germany

Phone: +49 381- 4 03 35-0