Standard Test Method for Evaluating Knee Bearing (Tibial Insert) Endurance and Deformation Under High Flexion

Importancia y uso:

4.1 This test method can be used to describe the effects of materials, manufacturing, and design variables on the fatigue/cyclic creep performance of UHMWPE bearing components subject to substantial rotation in the transverse plane (relative to the tibial tray) for a relatively large number of cycles.

4.2 The loading and kinematics of bearing component designs in vivo will, in general, differ from the loading and kinematics defined in this test method. The results obtained here cannot be used to directly predict in vivo performance. However, this test method is designed to enable comparisons between the fatigue performance of different bearing component designs when tested under similar conditions.

4.3 The test described is applicable to any bicompartmental knee design, including mobile bearing knees that have mechanisms in the tibial articulating component to constrain the posterior movement of the femoral component and a built-in retention mechanism to keep the articulating component on the tibial plate.

Subcomité:

F04.22

Volúmen:

13.02

Número ICS:

11.040.40 (Implants for surgery, prothetics and orthotics)

Palabras clave:

deformation; fatigue; fracture; high flexion; knee; mobile bearing; rotation; TKR (total knee replacement); UHMWPE (ultra high molecular weight polyethylene);