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Femoral head torsion test ISO 7206-13

Normative References  

ISO 7206-13: Implants for surgery - Partial and total hip joint prostheses - Part 13: Determination of resistance to torque of head fixation of stemmed femoral components  

A modular fitting between ball and stem is subjected to torsion loading until movement occurs. Amongst others, the loosening torque is determined. Special care is necessary testing ceramic balls: Due to the high torsional moments, small flats may be required to fixate this component.