Coated implant

An orthopedic implant comprising:

• a first bone contacting plate including:
• a first metallic substrate;
• a first diamond-like carbon (DLC) layer coated onto the first metallic substrate;
• and
• a second bone contacting plate including:
• a second metallic substrate;
• and
• a second diamond-like carbon (DLC) layer coated onto the second metallic substrate;
• and
• a resilient core comprising a resilient polymeric material bonded to the first and second DLC layers so as to join the first and second bone contacting plates, the resilient core disposed between the first and second bone contacting plates;
• wherein the first DLC layer is made of an amorphous DLC, wherein the first DLC layer has a hydrogen content between 0 atomic % and about 35 atomic %, and wherein the first DLC layer has variable hydrogen content gradient, and wherein the hydrogen content increases in a direction from said first substrate towards said resilient core.