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Structural Bone-Implant Compatibility in Design of the Needle-Palisade Fixation System for Total Hip Resurfacing Arthroplasty Endoprosthesis

Rogala P., Uklejewski R., Winiecki M., Mielniczuk J.

Machine Dynamics Problems

2008

Vol. 32, No. 2

57-62

The paper presents results of the experimental investigations on the structural compatibility in bone-implant fixation on the needle-palisade fixation system prototype of the cementless THRA (total hip resurfacing arthroplasty) endoprosthesis (Rogala's patents, 1999, Rogala, Uklejewski, 2006, Rogala, Uklejewski et al., 2006,). The main purpose of this research was to design the geometrical constructional properties of the needle-palisade fixation system for the prototype of the THRA endoprosthesis assigned for pre-clinical in vivo tests on animals. The most advantageous needle variant in aspect of its fit to the porosity of the inter-trabecular space of animal bone was proposed on the base of SEM observations and measurements of microstructure of trabecular bone from femoral head. There are also presented results of the needle-palisade fixation system optimization. The optimization was performed with the use of "the trabecular bone marrow lacunae and needles coincidence index" defined as number of needle's peaks covering the pores of the inter-trabecular porosity compartment of bone to total number of needles in the needle-palisade fixation system reproduced on the SEM micrographs of the trabecular bone from animal femur head.

Laser Forming vs. Electrical Discharge Machining of Needle-Palisade Fixation Systems for Cementless THRA Endoprosthesis Preprototypes

Rogala P., Mielniczuk J., Uklejewski R., Winiecki M., Auguściński A., Berdychowski M.

Machine Dynamics Problems

2008

Vol. 32, No. 1

80-87

This paper presents results of prototyping of cementless THRA endoprosthesis with needle-palisade fixation system designed within the framework of the research project No 4 T07C 056 29. There are presented main instructions for modelling and prototyping according to Rogala's patents (Rogala, patents, 1999). CAD models present fragments of the needle-palisade fixation system, semicircle shaped fragments of the endoprosthesis and preprototype of total THRA endoprosthesis. The modelled elements were saved as STL format and printed with SLA. To verify the possibility of manufacturing of needle-palisade fixation system of the Rogala's cementless THRA endoprosthesis various samples of the fixation system were manufactured by one of direct metal manufacturing (DMM) technology - Selective Laser Melting (SLM). Fragments of needle-palisade fixation system were also manufactured by Electrical Discharge Machining (EDM). The paper presents the variety of designed samples and remarks concerning the producibility the needdle-palisade fixation manufacturing with the considered technologies.