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The Use of Mixed Reality in Custom-Made Revision Hip Arthroplasty: A First Case Report

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Hemiarthroplasty in young patients.

Hazimah Mahmud^1,2, Dong Wang^1,3, Andra Topan-Rat⁴

¹Department of Mechanical Engineering, Imperial College London, London, UK.

The Bone & Joint Journal

|October 31, 2024

Summary

Ceramic and metal humeral hemiarthroplasties both caused significant glenoid cartilage wear in vitro. Neither material demonstrated superior performance, suggesting ceramic may not be a better alternative for shoulder hemiarthroplasty in patients with healthy cartilage.

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Reverse Total Shoulder Arthroplasty

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Area of Science:

Orthopedic Surgery
Biomaterials Science
Wear Tribology

Background:

Humeral hemiarthroplasty is used for shoulder joint restoration.
Glenoid erosion is a complication that can limit implant survival.
Ceramic materials offer potential advantages over metal due to superior tribological properties.

Purpose of the Study:

To compare the in vitro wear performance of ceramic versus metal humeral hemiarthroplasties.
To assess the impact of these materials on natural glenoid cartilage erosion.

Main Methods:

Utilized a shoulder wear simulator with cadaveric shoulders (ceramic n=8, metal n=9).
Simulated daily activity for 500,000 cycles with lubrication.
Quantified glenoid cartilage wear using micro-CT scans at 125,000-cycle intervals.

Main Results:

Both ceramic and metal hemiarthroplasties led to significant glenoid cartilage thickness reduction (27% and 29%, respectively).
No significant difference in wear was observed between ceramic and metal groups (p=0.606).
Wear patterns were unpredictable, with no correlation to patient or implant factors.

Conclusions:

Despite ceramic's favorable tribological properties, it did not show superior wear performance compared to metal in this study.
Current evidence does not support ceramic hemiarthroplasty as a better alternative to metal for shoulders with intact glenoid cartilage.