hip components coated with calcium phosphate BONIT® for optimised and improved osseointegration

Electrochemical calcium phosphate layer: BONIT®


BONIT® is an electrochemical coating technique developed by DOT that is used to apply a thin, resorbable calcium phosphate layer on orthopaedic implants.

BONIT® Coatings - PDF: 500 KB

BONIT® coating on additive manufacturing made implants - PDF: 2 MB

Calcium-Phosphat-coated (BONIT®) hip cup
Range of Application
  • Joint implants: hip joint, knee joint, ankle joint , shoulder joint, wrist joint, finger implants and spinal implants
Advantages of the Procedure
  • Microporosity with high capillarity
  • Complete and uniform coverage of porous surfaces and complex implant geometries
  • No flaking of particles or coating delaminations
  • Large free calcium and phosphate reservoir on the implant surface after surgery offers ideal proliferation conditions for osteoblasts
  • Faster and better healing
  • "Non-line-of-sight" process
  • Colour: light grey
  • Coating thickness: 20±10 µm
  • Porosity: 60 %
  • Adhesion strength: ≥ 15 MPa
  • Ca/P ratio: 1.1±0.1
  • Phase composition: ≥ 70 % Brushite/≤ 30 % HA
  • Outstanding biocompatibility
  • Fine crystalline structure with high inner surface
  • High capillarity effect
SEM pictures of BONIT® surface
SEM pictures of BONIT® surface (electrochemical calcium-phosphat-coating)


The BONIT®-HA coating is generated by a chemical conversion of the applied BONIT® coating. Read more>>

Plasma-Sprayed HA

At DOT, the plasma sprayed HA coating is applied to the implants in a vacuum chamber using the VPS vacuum technique. Read more>>

Charles-Darwin-Ring 1a
18059 Rostock l Germany

Phone: +49 381- 4 03 35-0
Fax: +49 381- 4 03 35-99


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