1. A spine stabilization component adapted to be mountable to a housing on a proximal end of a bone anchor having a longitudinal anchor axis, the component comprising: a clamp ring adapted to be mountable on the housing such that the clamp ring may be rotated around the anchor axis; a rod clamp mounted on the clamp ring; a rotary joint between the clamp ring and the rod clamp which allows the rod clamp to rotate relative to the clamp ring around a joint axis which is perpendicular to the anchor axis; an aperture through the rod clamp sized and adapted to receive a vertical rod along an aperture axis perpendicular to the joint axis; a fastening mechanism wherein operation of a single fastener is adapted to secure a vertical rod within the aperture, lock the rotary joint and secure the clamp ring to the housing and the clamp ring has a plurality of splines complementary to a plurality of splines of said housing; whereby the clamp ring may be secured in a plurality of discrete angular orientations about the housing and whereby the splines of the clamp ring are adapted to engage the splines of the housing to prevent rotation of the clamp ring when the clamp ring is secured to the housing.
1. A spine stabilization component adapted to be mountable to a housing on a proximal end of a bone anchor having a longitudinal anchor axis, the component comprising: a clamp ring adapted to be mountable on the housing such that the clamp ring may be rotated around the anchor axis; a rod clamp mounted on the clamp ring; a rotary joint between the clamp ring and the rod clamp which allows the rod clamp to rotate relative to the clamp ring around a joint axis which is perpendicular to the anchor axis; an aperture through the rod clamp sized and adapted to receive a vertical rod along an aperture axis perpendicular to the joint axis; a fastening mechanism wherein operation of a single fastener is adapted to secure a vertical rod within the aperture, lock the rotary joint and secure the clamp ring to the housing and the clamp ring has a plurality of splines complementary to a plurality of splines of said housing; whereby the clamp ring may be secured in a plurality of discrete angular orientations about the housing and whereby the splines of the clamp ring are adapted to engage the splines of the housing to prevent rotation of the clamp ring when the clamp ring is secured to the housing. 5. The spine stabilization component of claim 1 , wherein: the aperture axis intersects the anchor axis; and the joint axis does not intersect the anchor axis.