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RADIAL HEAD ARTHROPLASTY WITH THE BIPOLAR IMPLANTS.

Vladimir I Lipovskyi¹, Igor V Boiko², Dmytryi E Shcherbakov³

¹DNIPRO NATIONAL UNIVERSITY OLES GONCHAR, DNIPRO, UKRAINE.

Wiadomosci Lekarskie (Warsaw, Poland : 1960)

|August 30, 2021

Summary

The new bipolar radial head (RH) implant shows reduced stress deviations in the bone-implant system compared to the KPS endoprosthesis. This developed RH endoprosthesis is suitable for radial head arthroplasty, ensuring structural integrity.

Keywords:

bone-implant system elbow joint radial head arthroplasty radial head endoprosthesis

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Area of Science:

Orthopedic biomechanics
Biomaterials engineering
Surgical implant design

Background:

Radial head arthroplasty is crucial for treating complex elbow fractures and joint instability.
Existing endoprostheses may present limitations in stress distribution and biomechanical compatibility.
Evaluating novel implant designs is essential for improving patient outcomes.

Purpose of the Study:

To analyze stress distribution in the bone-implant system during elbow movement with a novel bipolar radial head (RH) endoprosthesis.
To compare the biomechanical performance of the developed RH implant against the KPS endoprosthesis.
To assess the suitability of the bipolar RH implant for radial head arthroplasty.

Main Methods:

Development of a metal-metal bearing bipolar RH endoprosthesis with porous coating for uncemented fixation.
Creation of a detailed 3D geometrical model of the elbow joint using Solid Works.
Finite-element analysis (FEA) using ANSYS to simulate stress distribution and strain fields.

Main Results:

The developed bipolar RH endoprosthesis exhibits greater stiffness than the KPS endoprosthesis.
The RH endoprosthesis demonstrates smaller deviations in displacement and strain fields compared to the healthy elbow.
The KPS endoprosthesis shows greater deviations in stress and strain compared to the healthy contralateral elbow.

Conclusions:

The bipolar RH endoprosthesis is biomechanically sound, with no critical impacts on surrounding joint structures.
The developed RH implant meets the strength and stiffness requirements for operative use.
The RH endoprosthesis offers a more favorable stress distribution profile than the KPS endoprosthesis for radial head arthroplasty.