A locking screwdriver configured to drive a bone anchor into bone, the locking screwdriver comprising: a shaft that defines a proximal end and a distal end that is spaced from the proximal end along a first direction, the distal end configured to be received by a driving opening of the bone anchor, the shaft defining a first guide member that extends from the distal end toward the proximal end along the first direction, the shaft including at least one ramp disposed at the distal end, each ramp defining a sloped surface that is angularly offset relative to the first direction, wherein the sloped surfaces flare outward along a third direction that extends substantially perpendicular to the first and second directions (L, A) as they extend along the first direction; a sliding member that includes a second guide member configured to engage the first guide member so as to direct the sliding member to translate along the shaft and onto each of the at least one ramp to a releasably locked position, wherein the locking screwdriver is releasably locked to the bone anchor when the sliding member and the distal end of the shaft are disposed in the driving opening and the sliding member is in the releasably locked position, wherein the at least one ramp is configured to cause at least a portion of the sliding member to be displaced radially outward within the driving opening; and an actuator configured to apply a force that biases the sliding member to translate along the shaft to the releasably locked position, characterized in that the at least one ramp includes a pair of ramps that are spaced apart from each other along a second direction that extends substantially perpendicular to the first direction, and in that the sliding member includes a projection supported by the sliding member that extends outward from the sliding member, wherein the shaft defines a groove sized to receive the projection, wherein the projection is configured to be received in the groove such that the projection can translate within the groove along the first direction when the sliding member is operated to the releasably locked position, wherein each ramp of the pair of ramps is disposed adjacent a respective opposed side of the groove. a shaft that defines a proximal end and a distal end that is spaced from the proximal end along a first direction, the distal end configured to be received by a driving opening of the bone anchor, the shaft defining a first guide member that extends from the distal end toward the proximal end along the first direction, the shaft including at least one ramp disposed at the distal end, each ramp defining a sloped surface that is angularly offset relative to the first direction, wherein the sloped surfaces flare outward along a third direction that extends substantially perpendicular to the first and second directions (L, A) as they extend along the first direction; a sliding member that includes a second guide member configured to engage the first guide member so as to direct the sliding member to translate along the shaft and onto each of the at least one ramp to a releasably locked position, wherein the locking screwdriver is releasably locked to the bone anchor when the sliding member and the distal end of the shaft are disposed in the driving opening and the sliding member is in the releasably locked position, wherein the at least one ramp is configured to cause at least a portion of the sliding member to be displaced radially outward within the driving opening; and an actuator configured to apply a force that biases the sliding member to translate along the shaft to the releasably locked position, characterized in that the at least one ramp includes a pair of ramps that are spaced apart from each other along a second direction that extends substantially perpendicular to the first direction, and in that the sliding member includes a projection supported by the sliding member that extends outward from the sliding member, wherein the shaft defines a groove sized to receive the projection, wherein the projection is configured to be received in the groove such that the projection can translate within the groove along the first direction when the sliding member is operated to the releasably locked position, wherein each ramp of the pair of ramps is disposed adjacent a respective opposed side of the groove.