Bone defect (more than 6 cm) is challenging. The use of free vascularized Fibular graft in reconstruction is an option. The aim of this retrospective study is to assess the clinical outcome as regarding to union, graft hypertrophy and complications in a short term follow up (at least one year follow up) . From: July 2017 to Dec 2023, a series of 14 patients (8 male - 6 female) reconstructed by 16 FVFG was reviewed retrospectively (two of them undergoes revision with ipsilateral Fibula) for at least one year follow up. The right side was involved in 6 cases and the left side in 8 cases with mean age 22 years ranging from (2-42) year. Sites of bone Defect include: Femur in four cases , Humerus in four cases, Tibia in three cases , Radius in two cases & Ulna in one case. The causes of bone defects were nonunion in five cases, tumor in five cases, post traumatic bone loss in 1 cases, psuedoarthrosis one case , osteomyelitis one case & infected modular TKA one case. Results : Bony union at both ends occurred only in five patients (30%).The time for graft union & hypertrophy positively correlated with age. Graft hypertrophy occurred in eight cases (60%). Nonunion (70%) ,implant failure (30%) & stress fracture (25%) were the most common complications .Short term functional outcomes : In the upper limb : only 2 cases (children) have a good result & one patient fair result after wrist arthrodesis.