Hemimandibulectomy and vascularized fibula flap in bisphosphonate-induced mandibular osteonecrosis with polycythaemia rubra vera.

This report presents the successful management of an advanced and refractory bisphosphonate-related osteonecrosis of the jaws (BRONJ) by hemimandibulectomy and an osteocutaneous fibula flap reconstruction in a patient with polycythaemia rubra vera, a rare haematological condition in which there is increased risk of thrombosis and haemorrhage. Union of the vascularized bone with the mandible depends on obtaining a BRONJ-free margin and rigid fixation of the bony ends. Magnetic resonance imaging can provide accurate delineation of necrotic bone and area of osteomyelitis. Placement of a 1cm margin beyond this can envisage a BRONJ-free margin. Aggressive medical management of polycythaemia rubra vera by venesection, asprin and cytoreduction therapy along with anticoagulant prophylaxis against thromboembolic events in the first 2 weeks following major surgery can provide the basis of a good surgical and flap outcome. Nevertheless, the possibility of unpredictable haemorrhage must be considered throughout.