Twenty-three cases of a pathological fracture through a lesion verified
histologically as non-ossifying fibroma were seen over a forty-nine-year
period. The average age of the patients at the time of fracture was twelve
years. All fractures except one were located in the lower extremity, most
frequently in the distal end of the tibia (ten). The percentage of bone
occupied by the fibroma in the transverse plane exceeded 50 per cent on
both the anteroposterior and the lateral radiographs in every patient. The
vertical length was always the maximum dimension and in all non-fibular
lesions exceeded thirty-three millimeters. Treatment consisted of cast
immobilization with biopsy at a later date, simple curettage, curettage and
autogenous bone-grafting, or segmental resection of fibular lesions.