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Engineering Platform and Experimental Protocol for Design and Evaluation of a Neurally-controlled Powered Transfemoral Prosthesis

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Engineering of a multi-station shoulder simulator.

Simon L Smith¹, Lisa Li², Thomas J Joyce³

¹School of Mechanical and Systems Engineering, Newcastle University, Newcastle upon Tyne, UK adobewombat@hotmail.com.

Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine

|May 11, 2016

Summary

This summary is machine-generated.

Engineers developed a novel multi-station shoulder simulator to test shoulder prostheses during daily activities. The simulator accurately measured wear rates, showing good agreement with hip simulator data for similar materials.

Keywords:

CoCrMo Simulator UHMWPE shoulder validation wear

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Area of Science:

Biomedical Engineering
Orthopaedic Research
Materials Science

Background:

Shoulder prostheses are crucial for restoring function after joint damage.
Accurate wear testing is essential for predicting implant longevity.
Existing simulators often lack the capacity to replicate complex shoulder kinematics and daily activities.

Purpose of the Study:

To engineer and validate a multi-station shoulder simulator for wear testing.
To assess the wear performance of reverse shoulder prostheses under simulated daily living conditions.
To establish a benchmark for future shoulder implant wear studies.

Main Methods:

Design and construction of a bespoke multi-station shoulder simulator.
Commissioning trials to validate simulator performance.
Wear testing of five JRI Orthopaedics Reverse Shoulder VAIOS 42mm prostheses for 2 million cycles.
Measurement of polymeric glenoid component wear rates.

Main Results:

The Newcastle Shoulder Simulator successfully replicated physiological motion and loading for daily activities.
A mean wear rate of 14.2 ± 2.1 mm³/10⁶ cycles was measured for the polymeric glenoid components.
Wear results demonstrated excellent agreement with hip simulator studies of similar materials when adjusted for test conditions.

Conclusions:

The developed simulator is the first of its kind capable of physiological shoulder activity simulation.
The wear performance of the tested prostheses is comparable to similar materials used in hip implants.
This simulator provides a valuable tool for advancing the understanding of shoulder prosthesis wear and longevity.