<s>[INST] Dear Doctor, I have a patient with infected nonunion fracture shaft femur with osteopetrosis. was operated 4 years back with DCP, got infected failed, was redone by a different surgeon with LCP and has failed again. Implant has been removed. Discharging sinus with nonunion present. can he be bailed out will Illizarov ring fixators. [/INST] Hi, thank-you for providing the brief history. As the surgery was failure trying the Lazaro ring fixation should work well but may need a bone graft as well. Since the previous surgeries were failure a thorough attention is advised in terms of checking the gaps formed due to previous implants. Bone graft should make some help for healing process to be optimum provided the limb is stabilized properly and all measures of Vitamin D3 supplement and calcium supplement is taken. Now since it's a femur you need to be conscious while making a new approach since he might have a lot of pain and the infection should be controlled beforehand, so the new technique do not fail. Regards Jay In Chat Doctor.  </s>