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.

HA Coatings - PDF: 400 KB

plasma sprayed HA coating on a hip stem
Range of Application
  • Joint implants: hip joint, knee joint, ankle joint, shoulder joint, wrist joint, finger implants and spinal implants
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 %
  • Adhesive strength: ≥ 15 MPa
  • Ca/P ratio: 1.67–1.76
  • Phase composition: ≥ 85 % HA/≤ 15 % a-TCP, ß-TCP, TTCPP
  • Porous, crystalline surface
  • Crystallinity of the HA layer: > 65 %
  • Very good biocompatibility
SEM pictures of the HA sprayed surface
SEM pictures of the HA sprayed surface


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