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1. A bone drill assembly comprising: a sheath having a proximal end and a distal end comprising a distal tip, and defining an interior channel elongated along a longitudinal sheath axis, wherein a first side of the sheath is disposed laterally of the sheath axis in a first direction and a second side of the sheath is disposed laterally of the sheath axis in a second direction, the sheath configured to receive a drill bit having a cutting burr; and a manipulation mechanism configured to be operably coupled with the drill bit received by the sheath and configured to manipulate the drill bit within the sheath to move the cutting burr relative to the first and second sides of the sheath, the manipulation mechanism providing lateral displacement of a distal end of the drill bit with respect to the longitudinal sheath axis, wherein the distal tip of the sheath comprises an end shape that is non-perpendicular to the sheath axis, wherein the manipulation mechanism comprises a ball and socket joint including a ball configured to be connected with the drill bit received by the sheath and a socket connected with the sheath and which at least partially surrounds and receives the ball, the ball having multiple degrees of motion within the socket, and wherein position of the ball relative to the cutting burr is calibrated with a distance between the socket and the distal tip of the sheath, such that when the ball is in register with the socket, the cutting burr is located at the distal tip of the sheath.
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