RESCUE REDUCTION BONE ANCHOR

Systems and methods for reducing spinal stabilization rods. One embodiment provides an instrument including a body (defining a threaded slot for receiving the spinal stabilization rod), an alignment feature, and a flange (for mounting the instrument on a bone anchor), each of which can correspond to portions of the bone anchor. The alignment feature can align the threads of the instrument and bone anchor to form substantially continuous threads. The alignment features can be a pin and a hole oriented radially with respect to the instrument. An actuator can actuate the instrument alignment features toward, or away from, the instrument body. An actuator slot can correspond to the instrument slot. The threads of the instrument slot can include a thread diameter transition portion. In some embodiments, the instrument threads can include an anti-splay feature which mitigates reaction moments arising from the reduction of the spinal stabilization rod.