SURFACE MODIFICATION ON THE SHEMB OF A TOTAL HIP ARTICLE REPLACEMENTINTRODUCTIONTitanium and its alloys are used in various applications due to their desirable properties. One of the main sectors where titanium is heavily used is in biomedical applications, where both implants and surgical tools use this element due to its biocompatibility, low modulus and excellent corrosion resistance. However, titanium exhibits poor tribological properties and so it is usually alloyed and undergoes surface modification to achieve the necessary optimum requirements. Biomedical implants are subject to high clinical requirements, which is why before their implantation in the human body, a surface modification process is carried out. The aim of carrying out such modifications includes: sterilizing the implant surface against contaminants before implantation, increasing bioactivity, increasing hardness and thus promoting the reduction of the wear rate of the implant and the introduction of 'a passive layer to minimize the release of ions into the body.1For this scope of this mission, a study on modifying the surface of a titanium alloy rod, used in a hip joint implant , will be studied. A total hip implant consists of an articulated support essentially carrying the femoral head, the cup and the stem. The rod is made of titanium alloy - Ti- 6Al- 4V where titanium is alloyed with aluminum and vanadium. When titanium is alloyed with these materials, excellent properties are achieved, such as a high strength-to-weight ratio and exceptional corrosion resistance.2 However, this alloy gives poor tribological properties and tends to seize when it is subject to a sliding movement due to its low hardness. of 36HRC.3 Several surface modification techniques are performed on the ti...... middle of paper ...... Advanced surface modification technology in the biomedical sector has the ability to offer not only a improvement of tribological properties but also to improve clinical requirements before and after implantation. These properties include cell growth and antibacterial effect.1-(pg4 doc.pdf)2-http://www.arcam.com/wp-content/uploads/Arcam-Ti6Al4V-Titanium-Alloy.pdf3- (reference ta lpdf twil )4- http://www.news-medical.net/whitepaper/20130903/Hydroxyapatite-Coating-for-Titanium-Implants.aspxTable 1 ghandek min http://www.azom.com/properties.aspx? ArticleID=1547 u l-pdf hi twil5- http://emedicine.medscape.com/article/2085501-overview6-http://www.intechopen.com/books/titanium-alloys-towards-achieving-enhanced-properties- for-diversified -applications/surface-modification-techniques-for-biomedical-grade-oxidation-carburization-of-titanium-and-alloys-