Failure detection and sensor based control in a motorized bone fixation device

A control system for use with an adjustable bone fixation device having a frame connectible to bone tissue and a plurality of struts connected to the frame, the control system comprising:

• a plurality of actuators associated with the plurality of struts, each actuator configured for adjusting a length of at least one strut;
• and
• circuitry configured to:
• signal the plurality of actuators to adjust the struts according to a predefined actuation plan which sets operational parameters and permitted ranges thereof;
• determine a situation of potential failure associated with at least one actuator and involving at least one of said operational parameters being out of the permitted range;
• delay, based on the determined situation of potential failure, entering an error mode in which the plurality of actuators are stopped;
• and
• re-attempting, after waiting a preset time period, adjustment of one or more of the struts according to the predefined actuation plan.