Accordion maneuver with a bone fixation device

An adjustable bone fixation device comprising:

• a first fixation element;
• a second fixation element;
• a plurality of adjustable length struts;
• and
• a control system comprising:
• 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 said first and said second fixation elements of the bone fixation device, wherein length adjustment thereof changes a spatial relationship between said first and said second fixation elements;
• and
• circuitry configured to control said one or more actuators to cause said first and second fixation elements to perform an accordion maneuver by performing a plurality of actuations to adjust the lengths of said adjustable length struts to create a reciprocal movement of said first and second fixation elements relative to each other;
• wherein planes of said first and said second fixation elements are configured to be orientated generally orthogonally to a central longitudinal axis of bone tissue;
• and
• wherein said first and said second fixation elements are sized and shaped to be configured to externally surround at least a third of a cross sectional circumference of said bone tissue, said cross section taken perpendicular to said central longitudinal axis.