Total hip replacement system with rotatable femoral magnet

A hip prosthesis, comprising

• (a) an acetabular component comprising a shell having an approximate shape of a hollowed spherical cap that comprises a central dome, a periphery, and an intermediate wall therebetween, wherein the shell comprises a concave inner surface, a convex outer surface, a thickness therebetween, and one or more magnets;
• and
• (b) a femoral component comprising
• (i) a stem comprising a proximal end and a distal end,
• (ii) a neck comprising a tapered end and a base end, wherein the base end of the neck is joined to the proximal end of the stem, and the neck extends at an angle from the stem,
• (iii) a spherical head that is affixed to the tapered end of the neck, wherein the spherical head comprises a spherical magnet, and wherein the spherical magnet is rotatable within the spherical head;
• wherein the spherical head comprises a tapered volume, an outside surface, and a thickness between the tapered volume and the outside surface, and wherein the tapered volume is configured to receive the tapered end of the neck;
• wherein the acetabular component is configured to receive all or a portion of the spherical head of the femoral component;
• and
• wherein the one or more magnets of the shell of the acetabular component and the spherical magnet of the spherical head of the femoral component are oriented to generate an attractive force therebetween.