JWK Wong, DKH Yip, JKF Kong, EP Chien, TWH shek
Department of Orthopaedics & Traumatology, The University of Hong Kong, Queen Mary Hospital, Pokfulam, Hong Kong

An unusual case of avulsion fracture of the tibial tuberosity with underlying angiomatosis in a middleaged man is described, with particular emphasis on the successful use of bisphosphonate in its treatment and the value of serial dual energy X-ray absorptiometry in its subsequent disease monitoring.
This case illustrates the importance of careful correlation of the clinical, radiological, and histological findings in the management of skeletal tumour and
tumour-like lesions. The differential diagnosis of osteolysis with vascular ectasia is discussed.

Key words: angiomatosis of bone; avulsion fracture; bisphosphonate; densitometry, X-ray; tibial tuberosity