Static tests of 3D-printed sockets of lower limb prosthetic sockets for combat trauma prosthetics

Authors:

Golovin Mikhail Andreevich – Head of Department of Innovative Technologies for Technical Rehabilitation of Institute of Prosthetics and Orthotics, Albrecht Federal Scientific and Educational Centre of Medical and Social Expertise and Rehabilitation, 50 Bestuzhevskaya Street, 195067 Saint Petersburg, Russian Federation; e-mail: golovin@center-albreht.ru; https://orcid.org/0000-0002-7063-1284.

Klimenko Fedor Nikolaevich – Research Fellow of Department of Innovative Technologies for Technical Rehabilitation of Institute of Prosthetics and Orthotics, Albrecht Federal Scientific and Educational Centre of Medical and Social Expertise and Rehabilitation, 50 Bestuzhevskaya Street, 195067 Saint Petersburg, Russian Federation; e-mail: reabin@center-albreht.ru; https://orcid.org/0000-0002-5076-6931.

Petrauskas Marina Vladimirovna – junior researcher of Department of Innovative Technologies for Technical Rehabilitation of Institute of Prosthetics and Orthotics, Albrecht Federal Scientific and Educational Centre of Medical and Social Expertise and Rehabilitation, 50 Bestuzhevskaya Street, 195067 Saint Petersburg, Russian Federation; e-mail: reabin@center-albreht.ru; https://orcid.org/0000-0001-9005-6259.

Amirovas Sergeyus – junior researcher of Department of Innovative Technologies for Technical Rehabilitation of Institute of Prosthetics and Orthotics, Albrecht Federal Scientific and Educational Centre of Medical and Social Expertise and Rehabilitation, 50 Bestuzhevskaya Street, 195067 Saint Petersburg, Russian Federation; e-mail: reabin@center-albreht.ru.

Utekhina Ekaterina Aleksandrovna – technical director of Laboratory for testing and examination of prosthetic and orthopedic products, Albrecht Federal Scientific and Educational Centre of Medical and Social Expertise and Rehabilitation, 50 Bestuzhevskaya Street, 195067 Saint Petersburg, Russian Federation; e-mail: reabin@center-albreht.ru.

Shcherbina Konstantin Konstantinovich – Grand PhD in Medical Sciences (Dr. Med. Sci.), Associate Professor, Deputy general director – director of Institute of Prosthetics and Orthotics, Albrecht Federal Scientific and Educational Centre of Medical and Social Expertise and Rehabilitation, 50 Bestuzhevskaya Street, 195067 Saint Petersburg, Russian Federation; e-mail: reabin@center-albreht.ru; https://orcid.org/0000-0001-7579-0113.

Annotation:

Introduction. The prosthetic socket is made according to the individual parameters of the user and is the most important element of the prosthesis. It is designed to accommodate the stump and is subjected to various stress effects during walking. The primary assessment of the reliability of prosthetic assemblies for resistance to an accidental serious event in which the assembly is able to perform its intended function (test strength), as well as to a significant single event, after which the assembly may become unusable for further use (ultimate strength), is carried out under the influence of static test loads

Aim. To carry out static tests of samples for compliance with the requirements of GOST R ISO 10328-2021.

Materials and methods. 10 extrusion-made PETG and PLA samples with different types of fasteners were tested. The tests included static loading and torsion.

Results. The test results showed that all samples passed basic static tests for test strength and ultimate strength. Five samples collapsed in the area of the transition from the bottom to the wall, one in the area of the bottom. Six samples were destroyed during the ultimate strength test, the nature of the destruction corresponds to brittle fracture. Three samples withstood extreme loading under two different loading conditions (on the toe and on the heel), after which 2 were tested for torsion and also successfully passed the tests.

Discussion. The results confirm compliance with the standards and a sufficient margin of safety for sleeves made by additive methods.

Conclusion. All samples of the prosthetic socket have passed the basic tests, which proves the possibility of using the prosthetic socketsof lower limb prostheses made by the additive method for both medical and training and permanent prosthetics, including after a combat injury.

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