ISO 7206-4, ISO 7206-6, ISO 7206-8 and ASTM F2068 Dynamic Fatigue Tests on Hip Endoprostheses

The hip joint consists of the femur and the pelvis. Diseases can make it necessary to replace parts of or the entire hip joint with an implant.

Embedding device_hip joint endoprotheses_ISO7206 (5)

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Dynamic Fatigue Tests on Hip Endoprostheses to ISO 7206-4, ISO 7206-6, ISO 7206-8 and ASTM F2068

The servohydraulic testing machine HC Compact or the

LTM

from ZwickRoell are used to simulate dynamic loads on a hip prosthesis stem in accordance with the relevant standards ISO 7206-4, ISO 7206-6, ISO 7206-8 and ASTM F2068. Use of the appropriate ZwickRoell embedding device enables the mechanical conditions specified in the standard, such as the orientation of the hip joint prosthesis to the test load or the embedding height, together with the angle of load application, to be defined with accuracy.

On the one hand, dynamic loading on the hip endoprosthesis stem while walking with an implant that is already loosening is simulated in order to check the stem life expectancy. On the other hand, alternating loading is applied to the neck region of the prosthesis, which is clinically well-anchored.
In addition, the ZwickRoell software allows you to run user-friendly progressive load tests (Locati tests). These tests can be implemented under physiological environmental conditions (for example, temperature-conditioned saline solution) with the use of the ZwickRoell temperature conditioning vessel.
This enables you to perform a corrosion test to ASTM F1875, which tests a modular junction's resistance to crevice corrosion and fretting corrosion under dynamic load.

ISO 7206 Implants for surgery – Partial and total hip joint prosthesis

ZwickRoell's hip endoprosthesis test fixture fulfills the requirements of ISO 7206 Implants for surgery - Partial and total hip joint prostheses.

Determination of endurance properties of stemmed femoral components

A minimum of six hip endoprosthesis stems must withstand 5 million load cycles with a maximum load of 2300 N and a minimum load of 300 N.

Number of cycles: 5 million (6 specimens)
Test frequency: up to 30 Hz
Load (ASTM F2068-03; ISO 7206-8): Fo: 2300 N; Fu: 300 N

Determination of endurance properties of head and neck region of stemmed femoral components

A minimum of six hip endoprosthesis stems must withstand 10 million load cycles at a load of 5.34 kN (R=0.1).

Number of cycles: 10 million (6 specimens)
Test frequency: up to 30 Hz
Load (ASTM F2068-03): Fo: 5340 N; Fu: 534 N

Endurance performance of stemmed femoral components with application of torsion

A precision-manufactured embedding device is used to embed the stem, ensuring exact orientation of the implant to the test loads.
Head and foot flange assembly for simple and durable installation, taking into consideration the necessary degrees of freedom for the test.

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