Surface hip joint system

The utility model relates to the technical field of medical instruments, and discloses a surface hip joint system which comprises an acetabulum outer cup and an acetabulum inner cup, barbs are arranged on the inner side of the acetabulum outer cup, the barbs extend towards the inner side of the acetabulum outer cup, the upper end faces of the barbs are inclined planes inclining downwards, the lower end faces of the barbs are planes, and the surfaces of the barbs are provided with grooves. The outer side of the acetabulum inner cup is provided with a guiding inclined plane and a locking groove which correspond to the barbs, the upper end of the locking groove is a closed end, the outer side of the locking groove is an open end, the guiding inclined plane is located below the locking groove, and the guiding inclined plane gradually extends to the open end of the locking groove in an inclined mode from bottom to top; the surface hip joint system solves the problems that an existing acetabulum outer cup and aceta