الفهرس 
1. IntroductionOnly 14 pages are availabe for public view
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Abstract
from the present study the following can be concluded:
BBL may remain silent with no symptoms in 60 % of the cases or may be symptomatic in 40% of the cases.
Any benign bone lesion can be complicated by pathological fracture, bones with benign bone lesion that have not yet fractured but are at the risk of being fractured, are described as “impending” fractures.
Pathological fracture on top of BBTs is more common in overweight patient, patients with Vigorous activity level and male patients, that is may be due to increase the load applied over the bone. But those factors still have no statistical significance in prediction of the pathological fracture risk.
Pathological fracture is more common in lytic lesions than blastic lesions and in medullary lesions than in cortical lesion.
BBLs with cortical thickness less than 25% of the host bone normal cortical thickness usually will end by fracture.
Cortical erosion is a very significant radiological value in prediction of pathological fracture in BBTs.
Eccentric BBTs, especially the aggressive types- whatever their sizes usually end by pathological fracture. Early prophylactic surgical interference is mandatory.
BBTs with size more than 2/3 of the whole host bone diameter and cortical thinning less than 25% of the normal host bone cortex are at higher risk of pathological fracture. Without any healing signs like calcification, prophylaxis interference is mandatory.
Asymptomatic BBTs with size less than 2/3 of the whole host bone diameter must be under regular clinical and radiological follow up. Gradual increase in the pain severity, lesion size, cortical thinning increase the risk of being fractured.
Accidentally discovered cystic lesions in the proximal humerus region or in the femur neck is commonly end by pathological fracture.
Host body response to the lesion like sclerosing and calcification indicate less risk for fracture.
As recurrence of aggressive benign BBTs is common, minimal surgical fixation may be good addition to the surgical treatment of the aggressive benign bone lesions especially around the knee lesions and in overweight and active patients.
Computed tomography (C.T) and magnetic resonance image (MRI) allow multi-plane assessment of the BBTs and support more accurate measurement of the lesion size, cortical thinning, erosion, and bone remodeling power like calcification and healing of the lesion rather than plain X- ray radiology. So MRI and C.T must be included in not only the diagnosis but also the management planning of any benign bone lesion.