Objective: To report and evaluate the complications of femoral lengthening using the Ilizarov fixator.Method: Retrospective study of 10 patients who underwent femoral lengthening between 2001 and 2008. Demographics were collected by reviewing the medical records of each patient.Results: Of 10 patients, seven (70%) were females. Average age was 20 years (range 11 – 48 years). Equal limb lengths were achieved in six patients. Three patients had significant residual leg length discrepancies. Lengthening was discontinued in two patients due to marked restriction in knee flexion. In the other patient lengthening was discontinued due to subluxation of the hip. One patient developed mild subluxation of the knee. One patient sustained a fracture following fixator removal. The fracture healed with a mild leg length discrepancy. All patients developed knee stiffness following lengthening. Nine patients achieved full knee extension and flexion greater than 90 .Conclusion: Generally, the number of complications and failures of lengthening increase in proportion to the length of distraction and the severity of the preoperative problems.