A 12 year old boy was brought with pain in the right lower limb and difficulty in walking and standing since two years.
Radiographs of the pelvis and both hip joints, both femur and tibia show osteopenia with markedly thinned cortices and gracile, bowed long bones. There is genu valgum with widened metaphyses. There are with multiple healed fractures in both femur and both tibia.