[Surface characterization of Al2O3-blasted titanium implants in total hip arthroplasty].

INTRODUCTION Shot peening and grit blasting techniques are used in several surface modifications for producing hip endoprostheses. Corund blasting techniques using highly pure Al2O3 particles to create a rough surface of titanium implants in cementless total hip arthroplasty achieve better osteointegration. An increasing number of publications in maxillofacial surgery and orthopedic surgery show that there is a significant contamination on corund-blasted surfaces. The latest research studies reported an effect of contaminant particles on early failure of endoprostheses associated with third body wear. The aim of our work was to evaluate the amount and particle size of Al2O3 on the implant surface. MATERIAL AND METHOD The surface of four different geometries (five parts each, ARR titanium acetabular reinforcement ring, anisotropic Vektor cup, Vektor titanium stem and modular MRP Titan stem) were analyzed with respect to Al2O3 particles. Grit blasting was performed with Al2O3 particles, Alodur SWSK, Fa. Treibacher. Field emission scanning electron microscopy (LEO 1525) was used for the detection of the Al2O3 particles at the implant surface with a backscattered electron detector. The particle size distribution as well as the average area of the covered surface was calculated with image analyzing software (analySIS, Soft Imaging System GmbH). RESULTS The surface of the anisotropic Vektor cup was contaminated at an average of 41.7+/-4.9%, the Vektor titanium stem at an average of 33.3+/-4.7%, the (MRP) Titan stem at an average of 30.6+/-4.2%, and the ARR titanium acetabular reinforcement ring at an average of 23.2+/-1.6 with Al2O3 particles over the whole surface orientated to the bone. DISCUSSION The results of this study clearly show that there is contamination of rough titanium surfaces with Al2O3 particles at an unexpectedly high percentage. With respect to third body wear in total hip arthroplasty, further studies are necessary to minimize contamination of roughened surfaces and maintain sufficient roughness for osteointegration.

[1]  A. Piattelli,et al.  Histologic and histomorphometric analysis of the bone response to machined and sandblasted titanium implants: an experimental study in rabbits. , 1998, The International journal of oral & maxillofacial implants.

[2]  Conrado Aparicio,et al.  Corrosion behaviour of commercially pure titanium shot blasted with different materials and sizes of shot particles for dental implant applications. , 2003, Biomaterials.

[3]  U. Holzwarth,et al.  Ergebnisse des zementfreien Hüftprothesenwechsels mit dem MRP-Schaft unter Verwendung des intrafemoralen Zugangs mit gefäßgestielter distaler Fensterung , 2002 .

[4]  D. Jobard,et al.  Grit-blasted titanium femoral stem in cementless primary total hip arthroplasty: a 5- to 10-year multicenter study. , 2001, The Journal of arthroplasty.

[5]  A Wennerberg,et al.  Determining optimal surface roughness of TiO(2) blasted titanium implant material for attachment, proliferation and differentiation of cells derived from human mandibular alveolar bone. , 2001, Clinical oral implants research.

[6]  Hans Jacob Rønold,et al.  Effect of micro-roughness produced by TiO2 blasting--tensile testing of bone attachment by using coin-shaped implants. , 2002, Biomaterials.

[7]  D. Berry.  Femoral revision: distal fixation with fluted, tapered grit-blasted stems. , 2002, The Journal of arthroplasty.

[8]  W. Luk,et al.  Contamination of titanium castings by aluminium oxide blasting. , 1995, Journal of dentistry.

[9]  K. Knahr,et al.  Adverse tissue reactions to wear particles from Co-alloy articulations, increased by alumina-blasting particle contamination from cementless Ti-based total hip implants. A report of seven revisions with early failure. , 2002, The Journal of bone and joint surgery. British volume.

[10]  A Nordenram,et al.  Metal release from plates used in jaw fracture treatment. A pilot study. , 1989, International journal of oral and maxillofacial surgery.

[11]  A. Hruska,et al.  Quality criteria for pure titanium casting, laboratory soldering, intraoral welding, and a device to aid in making uncontaminated castings. , 1991, The Journal of prosthetic dentistry.

[12]  S. Mishra,et al.  Surface characterization of titanium-based implant materials. , 2000, The International journal of oral & maxillofacial implants.

[13]  Ann Wennerberg,et al.  A histomorghometric study of screw‐shaped and removal torque titanium implants with three different surface topographies , 1995 .