<prompt> Fracture shaft of femur in adult unites by3 to 4 weeks3 to 4 weeks3 to 4 months4 to 6 months  <response>: C i.e. 3-4 months It is said that a fractured shaft femur should unite in 100 days, plus minus 20 3 - 4 rnonthsQ. But nonunion is probably best defined by a lack of progression of healing combined with clinical symptoms of discomfo at a minimum of 6 months from the time of treatment. Fuher, a nonunion implies that healing is considered unlikely without fuher intervention. 