A medical device kit for assisting in the attachment of an artificial caput femur surface to an artificial acetabulum surface in an artificial articulating hip joint. The medical device kit comprises a first and second locking member for locking the artificial acetabulum surface clasping the artificial caput femur surface. The first and second locking members are each configured to, in a first state, hold the artificial caput femur surface clasped in the artificial acetabulum surface, and, in a second state, release the artificial caput femur surface from the artificial acetabulum surface. The locking members are adapted to change from the first state to the second state when first and second pre-determined strains are placed on the locking members, respectively. The second pre-determined strain is larger than the first predetermined strain.
