Internal fixation for long bone tumors is still a debatable topic. Approximately 75% of children present with pathological fracture in case of unicameral bone cyst and osteoid osteoma. We report a case of unicameral bone cyst of neck of femur and another case of osteoid osteoma at distal end of fibula wherein both the cases underwent bone curettage and prophylactic internal fixation. After 3 months of follow up both the patients are having full range of movements of the affected joint and are walking full weight bearing, Five year follow up, No recurrance, Prophylactic internal fixation showed good results and can prevent pathological fracture in future in bone tumors.

Keywords: Unicameral Bone Cyst; Osteoid Osteoma; Prophylactic Internal Fixation; Pathological Fracture.