The machining process and multi-sensor measurements of the friction components of total hip joint prosthesis

• Published in: Measurement : journal of the International Measurement Confederation 2018-02, Vol.116, p.56-67
• Main Authors: Niemczewska-Wójcik, Magdalena, Wójcik, Artur
• Format: Article
• Language: English
• Subjects: Biomaterials; Biomedical materials; Coordinate measuring machines; Dimensional tolerances; Friction; Hydroxyapatite; Machining; Machining process; Measurement; Measurement methods; Measuring instruments; Mechanical properties; Multi-scale analysis; Multi-sensor measurements; Prostheses; Roundness; Scanning electron microscopy; Sensors; Sockets; Surface finish; Surface properties; Surface topography; Surgical implants; Topography; Total hip joint prosthesis; White light
• ISSN: 0263-2241; 1873-412X
• DOI: 10.1016/j.measurement.2017.10.045

[Display omitted] •The manufactured friction parts of a total hip joint prosthesis were examined.•The bearing surface topography was analyzed by means of CMM, WLI, SEM.•The requirements of the standards for balls as well as sockets were met.•The manufactured friction parts should be checked in tribological research. The paper presents issues concerning the manufacturing process and investigation of surface topography of polymeric sockets and ceramic balls incorporated into total hip joint prosthesis. In the manufacturing process of friction pairs, a crucial role is played by the type and mechanical properties of a material as well as the stages of machining process. The produced surface topography is then checked and evaluated against the requirements of the standard ASTM F2033-12 which refers to the methods for measuring the permissible limits of dimensional tolerances, departure from roundness, and surface finish (defects and roughness parameters) of the examined components. The measurements of surface topography were performed with the following measuring devices: coordinate measuring machine, white light interference microscopy, and scanning electron microscopy. The produced results provided the basis for conclusions and indicated directions for further research. All studied components meet the requirements of ASTM F2033-12. Identified manufacturing errors, which fall within the error limits, result from many factors that can be eliminated by improving the machining process. The next step in research is to review the accuracy of the machined friction parts using a hip joint simulator.