ASTM F 1820 (F-1820) determines the attachment strength between the modular acetabular shell and liner. The axial disassembly force for shoulder and hip implants is an important application of this standard. The test method used to determine the axial locking strength of the liner into a prostheses hip socket implant is thoroughly outlined. The locking strength of the acetabular liner in the modular shell is determined by applying a tensile load. This test is specifically used for determining locking strength of acetabular liner in a modular shell, but in locking devices of this type failure may be caused by loads other purely tension loads. In order to determine the proper alignment between the shell and liner of the acetabular device, a fatigue test is conducted.
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