A device includes a plurality of rings. Each ring has a first face, a second face, and at least one slot defined by first and second interior edges of the ring on opposing sides of the slot. The at least one slot penetrates from the first face to the second face. The first face of each ring has a first recess adjacent the slot on the first edge and a second recess adjacent the slot on the second edge. A plurality of posts join each one of the plurality of rings to an adjacent one of the plurality of rings.

An orthopedic tool includes a main body and a reference member. The reference member may be configured to engage an anatomical feature of a patient, such as the patient's bone. The angle of the reference member may be adjusted using a knob.

A system includes a cutting guide having a base body configured to be fixed to a first bone of a patient and a cutting slot block configured to provide a guide for cutting at least one of the first bone and a second bone of the patient. The cutting slot block is rotationally coupled to the base body. The cutting slot block is configured to rotate in a first rotational direction. The cutting guide comprises a distal portion and a proximal portion.

A control system for use with an adjustable bone fixation device including a first fixation element and a second fixation element connectable to bone tissue portions on either side of a treatment site, the control system including: one or more actuators configured to controllably adjust lengths of a plurality of adjustable length struts of the bone fixation device, the plurality of adjustable length struts connecting the first and the second fixation elements of the bone fixation device, length adjustment thereof changing a spatial relationship between the first and the second fixation elements; and circuitry configured to control the one or more actuators to cause the first and second fixation elements to perform an accordion maneuver by performing a plurality of actuations to adjust lengths of the plurality of adjustable length struts to create a reciprocal movement of the first and second fixation elements relative to each other.

A device includes a plurality of rings. Each ring has a first face, a second face, and at least one slot defined by first and second interior edges of the ring on opposing sides of the slot. The at least one slot penetrates from the first face to the second face. The first face of each ring has a first recess adjacent the slot on the first edge and a second recess adjacent the slot on the second edge. A plurality of posts join each one of the plurality of rings to an adjacent one of the plurality of rings.