Treatment of spinal irregularities, including, in one or more embodiments, dynamic spine stabilizers and systems that can be used to stabilize one or more motion segments in a patient's spine. Spine stabilization systems may comprise a first bone fastener configured to attach the spine stabilization system to a first vertebra. Spine stabilization systems further may comprise a second bone fastener configured to attach the spine stabilization system to a second vertebra. Spine stabilization systems further may comprise a dynamic spine stabilizer configured to connect the first bone fastener and the second bone fastener with at least some relative movement between the first bone fastener and the second bone fastener.