Researchers at the Department of Mechanical Engineering of the Technological Institute of Celaya (ITC) design and manufacture knee prostheses made of ultra-high-molecular-weight-polyethylene (UHMWPE). These prostheses are coated with biocompatible materials, such as hydroxyapatite and calcium oxide, making them more durable and resistant.

Initially we collaborate with the Mexican Social Security Institute (IMSS), the University of Guanajuato and Dr. Leonel Daza Benitez, who is a specialist in rheumatology at the Hospital Angeles in Leon. We started developing a first prosthetic knee to help in conditions like osteoarthritis, which is damage to the cartilages, and prostheses to care for it are very expensive for patients,” said Raul Lesso Arroyo, head of ITC’s Biomechanics Area.

The investigator indicated that the prostheses proposed are made of UHMWPE, titanium (Ti) and biocompatible materials coatings to prevent wear: hydroxyapatite and calcium oxide.

Normally prostheses for this condition get damage over time, resulting in the need to operate again the patient 5 or 10 years later. This is why these coatings based on hydroxyapatite and calcium oxide were thought, which is part of an investigation newly developed in the Materials Laboratory, by Dr. Carolina Hernandez Navarro, advised by Dr. Karla J. Moreno,” he said.

Lesso Arroyo said they received resources from Fondos Mixtos (Joint Funds, FOMIX) of the National Council for Science and Technology (CONACYT) and the Government of Guanajuato to design and develop the knee prosthesis, and for the development of a test to measure the level of wear and tear suffered by knee prostheses.

Once with prosthesis made and the test in operation, the testing work took us about a month per prosthesis. The students monitored the wear and tear of the prosthesis up to a million and a half cycles under extreme loads, more or less equivalent to 15 years of its life. We delivered the results to the Council for Science and Technology of the State of Guanajuato (CONCYTEG). This prosthesis and its anatomy to adapt it to the bones are technically validated. We are now making the necessary steps to obtain the approval of the Federal Commission for the Protection against Sanitary Risks (COFEPRIS), which is the regulator for the sale and entry of medical devices in Mexico,” he said.


Source: Agencia Informativa CONACYT