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Fatigue Test - ISO 7206-4, ISO 7206-6 and PI-58 (ISO 7206-8)Fatigue Test - ISO 7206-4, ISO 7206-6 and PI-58 (ISO 7206-8) Femoral head torsion test - ISO 7206-13Femoral head torsion test - ISO 7206-13 Femoral Head Compression Test - ISO 7206-10/ ASTM F2345/ PI-14Femoral Head Compression Test - ISO 7206-10/ ASTM F2345/ PI-14 Femoral Head pull-off test - ASTM F 2009Femoral Head pull-off test - ASTM F 2009 Luxation test - PI-3Luxation test - PI-3 Hip surface analysis - ISO 7206-2Hip surface analysis - ISO 7206-2 Hip Wear Test - ISO 14242-1Hip Wear Test - ISO 14242-1 Disassembly Forces of Modular Acetabular Devices - ASTM F1820Disassembly Forces of Modular Acetabular Devices - ASTM F1820 Fretting Corrosion Testing of Modular Implants – Femoral Stem-Head Interface - ASTM F1875Fretting Corrosion Testing of Modular Implants – Femoral Stem-Head Interface - ASTM F1875 Hip Range of Motion – ISO 21535Hip Range of Motion – ISO 21535 Fatigue test - ASTM F 2580Fatigue test - ASTM F 2580 Impingement Test - ASTM F2582Impingement Test - ASTM F2582 Insert Compression Test - PI-11Insert Compression Test - PI-11 Microseparation test - PI-78 (ISO 14242-4)Microseparation test - PI-78 (ISO 14242-4) Third body wear test based on - ISO 14242-1Third body wear test based on - ISO 14242-1 High demand hip wear testing - ASTM F3047MHigh demand hip wear testing - ASTM F3047M Deformation test for acetabular shells - ISO 7206-12Deformation test for acetabular shells - ISO 7206-12 3D Frictional torque measurement of total hip joint prostheses - PI-643D Frictional torque measurement of total hip joint prostheses - PI-64 Guide for assessment of hard-on-hard articulation THR devices - ASTM F3018Guide for assessment of hard-on-hard articulation THR devices - ASTM F3018 Impact Resistance Femoral Heads - ISO 11491Impact Resistance Femoral Heads - ISO 11491 FEA Non-modular Hip Femoral Stem - ASTM F2996FEA Non-modular Hip Femoral Stem - ASTM F2996 Requirements for Femoral Prostheses - Metallic Implants - ASTM F2068Requirements for Femoral Prostheses - Metallic Implants - ASTM F2068 Bearing surface characterization of retrieved hard-on-hard hip prostheses - ...Bearing surface characterization of retrieved hard-on-hard hip prostheses - ASTM F2979 Specific Requirements for Hip-joint Replacement Implants - ISO 21535Specific Requirements for Hip-joint Replacement Implants - ISO 21535 Particular requirements for joint replacement implants - ISO 21534Particular requirements for joint replacement implants - ISO 21534 Fatigue Test of Acetabular Devices - ASTM F3090Fatigue Test of Acetabular Devices - ASTM F3090 Classification and Designation of Dimensions - ISO 7206-1Classification and Designation of Dimensions - ISO 7206-1

Microseparation test - PI-78 (ISO 14242-4)

Normative References  



PI-78: (ISO 14242-4) Implants for surgery - wear of total hip-joint prostheses - Part 4: Testing total hip joint prostheses under variations in surgical positioning

Hard-on-hard bearings in Total Hip Replacements (THR) have shown very low wear rates when tested according to ISO 14242-1 under standard gait conditions. ISO 14242-4 specifies a more severe loading scenario, simulating edge loading due to steep acetabular cup inclination and dynamic separation (micro-separation).
Clinically micro-separation is assumed to occur during the swing phase when the load is minimal and is associated with joint laxity, medialized cups or femoral head offset deficiency. For in-vitro testing, micro-separation is generated by a spring, which produces a medial-superior translation of the cup relative to the femoral head resulting in localized contact between the head and the superior rim of the cup. The distraction of the head from the cup is measured using latest high-accuracy digital contact sensors.

 


Implant Testing - Microseparation test - PI-78 (ISO 14242-4) Microseparation test - PI-78 (ISO 14242-4)