Design and development of standard porous tantalum acetabulum filling block

There are a variety of acetabular defects, especially those of varying degrees due to revision, remediation of previous hip reconstruction, and implant failure. The existing acetabulum filler blocks on the market are mainly titanium alloy or cobalt-chromium alloy prepared by traditional machining, and the product structure design is simple. On the one hand, it can not meet the needs of filling various degrees of acetabular bone defects; on the other hand, it has a high clinical loosening rate when used in combination with hip prosthesis, which greatly increases the risk of secondary surgery.

In collaboration with the First Affiliated Hospital of Army Medical University, the company completed the structure and specification design of porous tantalum acetabulum filling block from clinical requirements to product formulation and prototype verification. The self-developed porous tantalum acetabular filling block, with an inner spherical diameter ranging from 30-80mm, can be used for spherical fitting and matching with all types of acetabular cups on the market. The thickness of the first scaffold ranges from 10-30mm, satisfying the filling and repair of bone defects at the annular edge of the acetabular in different degrees. The porous filling of the all-dimensional bone imitation trabecular structure increases the friction between the prosthesis and the host bone, and at the same time, the mechanical properties of the titanium alloy material are more matched with the bone tissue, which is more conducive to promoting the long-term effect of bone integration. In addition, the whole property of the porous layer is improved, especially the integrity and mechanical strength of the porous structure on the contour interface. The advent of porous tantalum acetabulum filler will break the monopoly of foreign brands of porous tantalum materials in the field of filling and repairing bone defects, and bring a new tool for the repair of bone defects in hip arthroplasty. (Technology Center of Guangzhou Sailong /Feng Kehan)