OrthoNet

Unicameral Bone Cyst (UBC)

- solitary, fluid-filled cystic lesions located in metaphysis of long bones near physis in kids & adolescents
- predominantly proximal femur & proximal humerus

Signs & Symptoms:
- usu asymptomatic
- pathologic # associated with minimal trauma

Xrays:
- radiolucent, trabeculated lesion with well-defined borders surrounding by sclerotic margin
- ‘fallen leaf’ sign in pathologic #

Histology:
- lined with loose connective tissue membrane containing small numbers of fibroblasts, giant cells & hemosiderin-laden macrophages

Treatment:
- 15% will heal after # with observation alone
- treat # as you would for most #s of that region
- once # healed, aspiration & steroid injections (x 3)
- curettage & bone grafting improves healing rate & provides mechanical support