CSTiTM (Cancellous-Structured Titanium TM) Porous Coating
Zimmer’s CSTi porous coating has over 15 years of clinical experience with demonstrated success in both retrieval and long-term clinical studies.
Optimal Microstructure and Material Promote Bone Ingrowth
CSTi porous coating combines the excellent biocompatibility of titanium with an optimal structure for bone ingrowth. CSTi porous coating is manufactured through a proprietary process that sinters commercially pure titanium powder onto a titanium- or CoCr-alloy substrate. During the process, pores are created. This results in a unique porous coating that has optimally-sized, interconnected pores¹ to allow bone ingrowth and a fine micro-roughness to provide secondary fixation.
CSTi coating is sintered onto the substrate at high temperature, resulting in a solid solution at the interface of the substrate and the CSTi coating. This results in excellent strength and cyclic fatigue properties.
Cancellous-Structured Titanium coating refers to the microscopic
appearance of CSTi porous coating. CSTi coating is
structurally similar to human cancellous bone and provides interconnected
pores for bone ingrowth. Left image: Human cancellous
bone.² (100X) Pore size 400-500 mm. Pore volume 60-77%.
Right image: CSTi coating. (100X) Pore size 480-560mm. Pore
Implant Designs Well Matched with CSTi Porous Coating Technology
We offer CSTi porous coating options with several of our product
lines, including: the Natural-Knee® II system,
Natural-HipTM and APR ® hip
stems, and Converge ® CSTi Porous Acetabular
Left image: Converge CSTi Porous Cluster-Hole
Acetabular Shell. Right image: Top view of
Bone-Contacting Surface of a Natural-Knee II Femoral Component.
The CSTi process was originally developed for application on a
titanium alloy substrate. The SinterlockTM process
was later devised to apply CSTi onto CoCr-alloy femoral knee
components. This bimetal combination was a major advancement that combined
the biocompatible properties of CSTi on the bone-contacting side of
the implant with the excellent wear properties of CoCr for the articulating
Cross-Sectional Side View of Natural-Knee II Femoral Component Demonstrating the Sinterlock Bimetal Combination of CSTi on CoCr-Alloy Substrate.