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Design and testing of a flexible hip prosthesis.

K Djerf¹, I Ivarsson, S A Jacobsson

¹Department of Orthopaedics, University Hospital, Linköping, Sweden.

Clinical Biomechanics (Bristol, Avon)

|August 7, 2013

Summary

Designing a flexible hip prosthesis from metal presents significant challenges. This study found that even advanced designs experienced fatigue failure, indicating the difficulty in achieving both flexibility and durability in such implants.

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Area of Science:

Biomaterials Engineering
Orthopedic Surgery
Mechanical Engineering

Background:

Hip prostheses aim to restore function and reduce pain.
Achieving natural elasticity and long-term durability in metal implants remains a challenge.
Current flexible prosthesis designs may have limitations in fatigue resistance.

Purpose of the Study:

To design and evaluate a novel flexible hip prosthesis with optimal proximal fit.
To investigate the fatigue life and failure modes of a titanium alloy hip prosthesis.
To compare the performance of the novel prosthesis against a commercially available flexible prosthesis.

Main Methods:

A titanium alloy hip prosthesis was engineered with a flexible, wedge-shaped proximal section and a slotted distal stem with a polymer spacer.

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Plasma-sprayed pure titanium coating was applied to promote bony ingrowth.

The prosthesis underwent mechanical fatigue testing under simulated physiological loading conditions (4000 N for 10 million cycles).

Main Results:

The novel flexible hip prosthesis failed due to fatigue after 600,000 cycles.
A reference commercially available flexible prosthesis failed earlier, at 29,000 cycles.
The failure mode observed was consistent with typical metal fatigue.

Conclusions:

Constructing a flexible metal hip prosthesis with adequate fatigue strength is technically challenging.
Current metal-based flexible hip prosthesis designs may not offer sufficient security against fatigue failure.
Further research is needed to determine the feasibility of durable, flexible metal hip prostheses.