Systems and methods for treating rib fractures and osteotomies using implantation

An anchor assembly for attaching to a rib comprising:

• a bone plate having at least one screw hole for receiving a bone screw to be inserted into the rib, the bone plate comprising a first end and a second end opposite the first end, wherein a length of the bone plate extends from the first end to the second end along a first longitudinal axis;
• a threaded shaft extending from the bone plate along a second longitudinal axis generally parallel to or coaxial with the first longitudinal axis;
• a clamp having a split body defining a pocket and first and second extensions each extending from the pocket and terminating at a first end defining a through hole sized to accept the threaded shaft, wherein the first extension comprises a first surface extending from the pocket to the first end and the second extension comprises a second surface extending from the pocket to the first end, the second surface facing the first surface;
• a flexible collet configured to be seated in the pocket and adapted to polyaxially receive a rod in the pocket wherein the flexible collet is a spherical collet having a spherical surface defined between an upper opening and a lower opening, and the spherical surface includes a plurality of first slits open to the upper opening and a plurality of second slits open to the lower opening, wherein each first slit is disposed between two adjacent second slits;
• and
• a lock for locking the split body to the threaded shaft, wherein, when the lock is locking the split body to the threaded shaft, the first surface is angled relative to the second surface.