Artificial hip joint prosthesis and method for mounting the same

A method for mounting an artificial hip joint prosthesis, wherein the artificial hip joint prosthesis comprises a spherical chamber and a ball head;

• an outer spherical surface of the ball head fits with an inner spherical surface of the spherical chamber to form a spherical hinge;
• an inner spherical surface of the spherical chamber has an opening in an elliptical shape or a similar shape with a long axis and a short axis, to allow insertion of the ball head;
• the long axis of the opening in the elliptical shape or the similar shape has a length A, and the short axis of the opening has a length B;
• and the ball head is mounted inside the spherical chamber and has a diameter C, wherein B<A≤C,
• wherein the method comprises:
• aligning or paralleling the axis of the first hole with the short axis of the opening, and mounting the ball head into the spherical chamber;
• and
• rotating the ball head by 90° and making the first hole face an exterior of the chamber, after the ball head is in the spherical chamber.