The aim of this retrospective study was to review the outcome of patients treated with Fassier-Duval (FD) rods and highlight some of the complications found during treatment. Between April 2006 and August 2010 we inserted 24 FD rods in 13 patients. 17 rods for osteogenesis imperfecta (OI), 2 for fractures and deformity associated with cerebral palsy, 1 for fracture associated with muscular dystrophy, 1 for fibrous dysplasia and 3 for centralisation of single bone forearms. In the upper limb one patient required revision for proximal migration of the male component and another patient is waiting for revision for the same problem. In the lower limb, a tibial nail was revised because of proximal migration of the male component. A femoral nail was adjusted because of loss of the proximal fixation. One of the OI patients fell, fractured the femur and bent a femoral nail. This awaits revision at a later date. A second OI patient fell on 2 separate occasions bending both a tibial and a femoral nail respectively. These were both revised to trigen intramedullary nails. In all the other cases there were no complications. In summary the Fassier Duval system provides a versatile way of providing intramedullary stabilisation for growing bones through a single entry point. However in our experience we have a 33% complication rate most notably bending of the rods. We advocate careful patient selection and using as high a diameter nail as is feasible

Purpose of the Study. A cooled, side cutting burr designed for use in adult foot surgery has been used as a primary bone cutting device in children to facilitate a truly percutaneous method of performing osteotomies. Stabilisation of the femur was using a percutaneous locked nail and for the tibia percutaneous K-wires. The author describes the advantages and disadvantages of this method with results from the first cohort of patients treated. Method. Patients under going osteotomy of the femur, tibia and fibula using a 2 mm × 20 mm side cutting burr were followed prospectively and assessed for scar size, bone healing time and complications. Results. Thirty six osteotomies were performed in the femur and tibia in 25 patients. A fibula osteotomy was always performed with a tibial osteotomy. Scar size for the femoral osteotomy was <15 mm and for the nail insertion <25 mm. For the tibia & fibula the scar size was <10 mm. Healing time was by 6 weeks in the tibia and in the femur was within 16 weeks in non-lengthening cases in all but 1 case of non-union (associated with Vitamin D insufficiency). Three burr bits broke during the learning curve including 2 in tibial osteotomies and 1 in the femur. Cortical thickness and slow burr speeds were associated with burr breakage. All wounds healed without infection. The optimum speed for the burr at 50 Nm of torque was established as 200 rpm in children under the age of 13 yrs. The initial recommended speed of 300 rpm increases healing time when performing osteotomies in children. Conclusion. Truly percutaneous surgery can be performed to osteotomise the femur and tibia using a cooled, side cutting burr with a locked femoral nail and crossed tibial wires with excellent cosmetic results and minimal complications. Level of Evidence IV

Aims

The Fassier Duval (FD) rod is a third-generation telescopic implant for children with osteogenesis imperfecta (OI). Threaded fixation enables proximal insertion without opening the knee or ankle joint. We have reviewed our combined two-centre experience with this implant.