HC series servohydraulic testing machine
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.
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).
Endurance performance of stemmed femoral components with application of torsion
Lever out test
Lever-out testing on hip joint pairings
Artificial hip joints must withstand both compressive loads and torsion loads. To determine the optimum materials and alloys, these are tested with a special testing machine,
consisting of a 20-kN ZwickRoell materials testing machine plus a 500-Nm torsion drive.
The artificial hip joint (here made of metal) is rotated on a support unit (torsion loading) and compression loading is applied at the same time. This tests materials and alloys best suited for artificial hip joints.