Case report reveals spontaneous bone regeneration in a 63-year-old woman post-segmental mandibulectomy, highlighting the 'Phoenix jaw' phenomenon in MRONJ treatment.
Segmental mandibulectomy is a valid treatment for advanced medication-related osteonecrosis of the jaw (MRONJ), but subsequent reconstruction is challenging. Spontaneous bone regeneration (SBR) following resection is exceedingly rare, particularly in the elderly. We present the case of a 63-year-old woman with stage 3 MRONJ who underwent a 60 mm segmental mandibulectomy. The defect was reconstructed with a titanium plate, with meticulous preservation of the periosteum. Over a three-year follow-up period, serial imaging demonstrated progressive and substantial bone regeneration along the plate, resulting in a robust, continuous mandibular segment without any bone grafting. This case highlights that SBR, a phenomenon metaphorically termed the "Phoenix jaw," can occur even in older patients with advanced MRONJ, challenging conventional expectations regarding bone regeneration in this patient population.
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Hino et al. (2025) studied this question.
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