Perm Polytechnic University team optimizes artificial hip joint design

According to the World Health Organization, the number of hip joint diseases and injuries is growing with increasing life expectancy. Most manufacturers use metal for hip replacement; however, the significant difference in the hardness of the cortical bone and the implant material can cause the endoprosthesis to loosen, which may require hip revision surgery after 5-10 years. A group from Perm Polytechnic University has explored a unidirectional composite material with properties similar to human bone and improved the prosthesis making it more wear-resistant.

Perm National Research Polytechnic University

Their study was published in the Journal of Machinery Manufacture and Reliability 2021.

An artificial joint consists of a stem and a ball. The bone prosthesis element is made of a fibrous composite material with carbon fiber in the form of a reinforcing substance and phenol-formaldehyde resin as a binder. The other part is made of titanium. The ball is installed with tension on the cone surface of the stem. The team proposed a computer simulation of the stress–strain state of the implant made of a carbon–carbon composite material in an elastic medium.

The research was financed by Tactical Missiles Corporation and private investors. The invention was recognized as a priority project in the Ural city of Nytva, where composite products for medical purposes will be manufactured.

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