Screw tower and rod reduction tool

A system comprising:

• a screw tower;
• an instrument comprising a driver shaft extendable longitudinally through the screw tower, and a threaded sleeve mounted on a proximal portion of the driver shaft;
• and
• a housing comprising one or more retention members coupleable to the screw tower, and a threaded button threadably coupleable to the threaded sleeve, wherein the threaded sleeve is rotatable about a longitudinal axis to urge the driver shaft longitudinally relative to the screw tower,
• wherein the screw tower comprises an outer sleeve defining a longitudinal slot, and an inner sleeve including a protrusion configured to extend radially outward through the longitudinal slot, the protrusion configured to move radially inward such that the protrusion is removed from the longitudinal slot.

A system comprising:

• a screw tower;
• an instrument comprising a driver shaft extendable longitudinally through the screw tower, and a threaded sleeve mounted on a proximal portion of the driver shaft;
• and
• a housing comprising one or more retention members coupleable to the screw tower, and a threaded button threadably coupleable to the threaded sleeve, wherein the threaded sleeve is rotatable about a longitudinal axis to urge the driver shaft longitudinally relative to the screw tower,
• wherein the housing comprises one or more biasing members that urge the one or more retention members toward an engaged position in which the one or more retention members are rigidly coupled to the screw tower.