These are important for the implants to be compatible with magnetic resonance imaging (MRI) techniques and to be visible under X-ray imaging. Generally, all metal implants are non-magnetic and high in density. Even more, a new type of biodegradable metals has been proposed as temporary implants ( Hermawan, 2009). Nowadays, large number of metallic biomaterials composed of nontoxic and allergy-free elements are being developed. Improving their bone conductivity has been done by coating with bioactive ceramics like hydroxyapatite ( Habibovic, 2002), or blood compatibility by coating with biopolymers ( Lahann, 1999). Hence, surface modifications are required. Metallic biomaterials are exploited due to their inertness and structural functions they do not possess biofunctionalities like blood compatibility, bone conductivity and bioactivity.
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