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Kostares E, Kostares M, Kostare G, Tsakris A, Kantzanou M. Prevalence of free flap failure in mandibular osteoradionecrosis reconstruction: a systematic review and meta-analysis. Sci Rep 2024; 14:11087. [PMID: 38750124 PMCID: PMC11096303 DOI: 10.1038/s41598-024-61862-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Accepted: 05/10/2024] [Indexed: 05/18/2024] Open
Abstract
Our study aimed to estimate the prevalence of total free flap failure following free flap reconstruction for mandibular osteoradionecrosis (mORN) and assess the impact of potential moderators on this outcome. A comprehensive systematic literature search was independently conducted by two reviewers using the Medline, Scopus, Web of Science and Cochrane Library databases. Quality assessment of the selected studies was performed, and prevalence estimates with 95% confidence intervals (CI) were calculated. Outlier and influential analyses were conducted, and meta-regression analyses was employed to investigate the effects of continuous variables on the estimated prevalence. Ultimately, forty-six eligible studies (involving 1292 participants and 1344 free flaps) were included in our meta-analysis. The findings of our study revealed a prevalence of 3.1% (95% CI 1.3-5.4%) for total free flap failure after reconstruction for mORN. No study was identified as critically influential, and meta-regression analysis did not pinpoint any potential sources of heterogeneity. These findings provide valuable insights for researchers and serve as a foundation for future investigations into the management of mandibular osteoradionecrosis and the prevention of free flap failure in this context.
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Affiliation(s)
- Evangelos Kostares
- Department of Microbiology, Medical School, National and Kapodistrian University of Athens, 115 27, Athens, Greece.
| | - Michael Kostares
- Department of Anatomy, Medical School, National and Kapodistrian University of Athens, 115 27, Athens, Greece
| | - Georgia Kostare
- Department of Microbiology, Medical School, National and Kapodistrian University of Athens, 115 27, Athens, Greece
| | - Athanasios Tsakris
- Department of Microbiology, Medical School, National and Kapodistrian University of Athens, 115 27, Athens, Greece
| | - Maria Kantzanou
- Department of Microbiology, Medical School, National and Kapodistrian University of Athens, 115 27, Athens, Greece
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Peterson DE, Koyfman SA, Yarom N, Lynggaard CD, Ismaila N, Forner LE, Fuller CD, Mowery YM, Murphy BA, Watson E, Yang DH, Alajbeg I, Bossi P, Fritz M, Futran ND, Gelblum DY, King E, Ruggiero S, Smith DK, Villa A, Wu JS, Saunders D. Prevention and Management of Osteoradionecrosis in Patients With Head and Neck Cancer Treated With Radiation Therapy: ISOO-MASCC-ASCO Guideline. J Clin Oncol 2024:JCO2302750. [PMID: 38691821 DOI: 10.1200/jco.23.02750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Accepted: 01/22/2024] [Indexed: 05/03/2024] Open
Abstract
PURPOSE To provide evidence-based recommendations for prevention and management of osteoradionecrosis (ORN) of the jaw secondary to head and neck radiation therapy in patients with cancer. METHODS The International Society of Oral Oncology-Multinational Association for Supportive Care in Cancer (ISOO-MASCC) and ASCO convened a multidisciplinary Expert Panel to evaluate the evidence and formulate recommendations. PubMed, EMBASE, and Cochrane Library databases were searched for randomized controlled trials and observational studies, published between January 1, 2009, and December 1, 2023. The guideline also incorporated systematic reviews conducted by ISOO-MASCC, which included studies published from January 1, 1990, through December 31, 2008. RESULTS A total of 1,539 publications were initially identified. There were 487 duplicate publications, resulting in 1,052 studies screened by abstract, 104 screened by full text, and 80 included for systematic review evaluation. RECOMMENDATIONS Due to limitations of available evidence, the guideline relied on informal consensus for some recommendations. Recommendations that were deemed evidence-based with strong evidence by the Expert Panel were those pertaining to best practices in prevention of ORN and surgical management. No recommendation was possible for the utilization of leukocyte- and platelet-rich fibrin or photobiomodulation for prevention of ORN. The use of hyperbaric oxygen in prevention and management of ORN remains largely unjustified, with limited evidence to support its practice.Additional information is available at www.asco.org/head-neck-cancer-guidelines.
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Affiliation(s)
| | | | - Noam Yarom
- Sheba Medical Center, Tel Hashomer, Israel
- Tel Aviv University, Tel Aviv, Israel
| | - Charlotte Duch Lynggaard
- Department of Otolaryngology, Head and Neck Surgery and Audiology, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | | | - Lone E Forner
- Department of Oral and Maxillofacial Surgery, Zealand University Hospital, Køge, Denmark
| | | | - Yvonne M Mowery
- UPMC Hillman Cancer Center, Pittsburgh, PA
- University of Pittsburgh, Pittsburgh, PA
| | | | - Erin Watson
- Department of Dental Oncology, Princess Margaret Cancer Center/Faculty of Dentistry, University of Toronto, Toronto, Canada
| | - David H Yang
- BC Cancer/University of British Columbia, Vancouver, Canada
| | - Ivan Alajbeg
- University of Zagreb School of Dental Medicine, Zagreb, Croatia
| | - Paolo Bossi
- Department of Biomedical Sciences, Humanitas University, Milan, Italy
- IRCCS Humanitas Research Hospital, Milan, Italy
| | | | - Neal D Futran
- University of Washington School of Medicine, Seattle, WA
| | | | - Edward King
- Northern Colorado Head and Neck Cancer Support Group, Windsor, CO
| | - Salvatore Ruggiero
- New York Center for Orthognathic and Maxillofacial Surgery, New York, NY
| | | | | | - Jonn S Wu
- BC Cancer/University of British Columbia, Vancouver, Canada
| | - Deborah Saunders
- Health Sciences North Research Institute, Northern Ontario School of Medicine, Health Sciences North, Sudbury, Ontario, Canada
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Doub JB, Kang A, Lee C, Dyalram D, Shih P, Twaddell WS, Lubek JE. Risk Factors for Infection Recurrence After Surgical Resection of Advanced Stage Osteonecrosis of the Mandible. J Oral Maxillofac Surg 2024; 82:332-340. [PMID: 38199239 DOI: 10.1016/j.joms.2024.01.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Revised: 12/28/2023] [Accepted: 01/01/2024] [Indexed: 01/12/2024]
Abstract
BACKGROUND Advanced stage osteoradionecrosis (ORN) and medication-related osteonecrosis of the jaw (MRONJ) are challenging disease entities requiring multimodal therapy including surgical resection. However, risk factors associated with infection recurrence are poorly understood. PURPOSE The purpose of this study was to identify risk factors associated with infection recurrence following resection of advanced stage ORN or MRONJ of the mandible. STUDY DESIGN, SETTING, SAMPLE This was a retrospective cohort study including patients who underwent segmental mandibulectomy for management of ORN or MRONJ between 2016 and 2021 at the authors' institution. Subjects who did not have margin viability data were excluded. PREDICTOR/EXPOSURE/INDEPENDENT VARIABLE The primary predictor variable was viability of resection margins on histopathologic analysis (viable or nonviable). Secondarily, other risk factors categorized as demographic (age, sex, race), medical (comorbidities), and perioperative (reconstructive modality, antibiotic duration, microbiological growth) were evaluated. MAIN OUTCOME VARIABLE The primary outcome variable was time to infection recurrence defined as time from surgical resection to clinical diagnosis of a fistula tract, abscess, or persistent inflammatory symptoms necessitating surgical intervention. COVARIATES Not applicable. ANALYSES Descriptive and bivariate statistics were used to identify associations between risk factors and time to infection recurrence. A significance level of P ≤ .05 was considered significant. RESULTS The cohort consisted of 57 subjects with a mean age of 63.3 ± 10.0 years (71.9% Male, 75.4% White) treated for ORN (47.4%) or MRONJ (52.6%). A total of 19/57 (33%) subjects developed a recurrence of infection with 1 and 2 year survival of 75.8 and 66.2%, respectively. Nonviable resection margins were associated with earlier time to infection recurrence (P ≤ .001, hazard ratio (HR) = 11.9, 95% confidence interval (CI) = 3.84 to 36.7) as was younger age (P = .005, HR = 0.921, 95% CI = 0.869 to 0.976) and atypical pathogen growth on culture (P = .002, HR = 8.58, 95% CI = 2.24 to 32.8). CONCLUSIONS AND RELEVANCE Histopathologic margin viability was associated with earlier time to infection recurrence following resection of advanced stage ORN or MRONJ of the mandible. Additional studies are needed to identify interventions that may improve outcomes in this demographic.
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Affiliation(s)
- James B Doub
- The Doub Laboratory of Translational Bacterial Research, University of Maryland School of Medicine, Baltimore, MD; Division of Clinical Care and Research, Institute of Human Virology, University of Maryland School of Medicine, Baltimore, MD.
| | - Allison Kang
- University of Maryland School of Medicine, Baltimore, MD
| | - Cameron Lee
- Department of Oral-Maxillofacial Surgery, University of Maryland, Baltimore, MD
| | - Donita Dyalram
- Department of Oral-Maxillofacial Surgery, University of Maryland Schools of Dentistry and Medicine, Baltimore, MD
| | - Pauline Shih
- Department of Anatomic Pathology, University of Maryland School of Medicine, Baltimore, MD
| | - William S Twaddell
- Department of Anatomic Pathology, University of Maryland School of Medicine, Baltimore, MD
| | - Joshua E Lubek
- Department of Oral-Maxillofacial Surgery, University of Maryland Schools of Dentistry and Medicine, Baltimore, MD
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Watson EE, Hueniken K, Lee J, Huang SH, Maghrabi A AE, Xu W, Moreno AC, Tsai CJ, Hahn E, McPartlin AJ, Yao CM, Goldstein DP, De Almeida JR, Waldon JN, Fuller CD, Hope AJ, Ruggiero SL, Glogauer M, Hosni AA. Development and Standardization of a Classification System for Osteoradionecrosis: Implementation of a Risk-Based Model. medRxiv 2023:2023.09.12.23295454. [PMID: 37745576 PMCID: PMC10516072 DOI: 10.1101/2023.09.12.23295454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/26/2023]
Abstract
Purpose Osteoradionecrosis of the jaw (ORN) can manifest in varying severity. The aim of this study is to identify ORN risk factors and develop a novel classification to depict the severity of ORN. Methods Consecutive head-and-neck cancer (HNC) patients treated with curative-intent IMRT (≥ 45Gy) in 2011-2018 were included. Occurrence of ORN was identified from in-house prospective dental and clinical databases and charts. Multivariable logistic regression model was used to identify risk factors and stratify patients into high-risk and low-risk groups. A novel ORN classification system was developed to depict ORN severity by modifying existing systems and incorporating expert opinion. The performance of the novel system was compared to fifteen existing systems for their ability to identify and predict serious ORN event (jaw fracture or requiring jaw resection). Results ORN was identified in 219 out of 2732 (8%) consecutive HNC patients. Factors associated with high-risk of ORN were: oral-cavity or oropharyngeal primaries, received IMRT dose ≥60Gy, current/ex-smokers, and/or stage III-IV periodontal disease. The ORN rate for high-risk vs low-risk patients was 12.7% vs 3.1% (p<0.001) with an area-under-the-receiver-operating-curve (AUC) of 0.71. Existing ORN systems overclassified serious ORN events and failed to recognize maxillary ORN. A novel ORN classification system, RadORN, was proposed based on vertical extent of bone necrosis and presence/absence of exposed bone/fistula. This system detected serious ORN events in 5.7% of patients and statistically outperformed existing systems. Conclusion We identified risk factors for ORN, and proposed a novel ORN classification system based on vertical extent of bone necrosis and presence/absence of exposed bone/fistula. It outperformed existing systems in depicting the seriousness of ORN, and may facilitate clinical care and clinical trials.
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Affiliation(s)
- Erin E Watson
- Department of Dental Oncology, Princess Margaret Cancer Centre
- Faculty of Dentistry, University of Toronto
| | | | - Junhyung Lee
- Department of Dental Oncology, Princess Margaret Cancer Centre
| | - Sophie H Huang
- Department of Radiation Oncology, Princess Margaret Cancer Centre; University of Toronto
| | | | - Wei Xu
- Department of Biostatistics, University Health Network
| | - Amy C Moreno
- The University of Texas MD Anderson Cancer Center, Department of Radiaion Oncology
| | - C Jillian Tsai
- Department of Radiation Oncology, Princess Margaret Cancer Centre; University of Toronto
| | - Ezra Hahn
- Department of Radiation Oncology, Princess Margaret Cancer Centre; University of Toronto
| | - Andrew J McPartlin
- Department of Radiation Oncology, Princess Margaret Cancer Centre; University of Toronto
| | - Christopher Mkl Yao
- Department of Otolaryngology - Head & Neck Surgery, University Health Network; University of Toronto
| | - David P Goldstein
- Department of Otolaryngology - Head & Neck Surgery, University Health Network; University of Toronto
| | - John R De Almeida
- Department of Otolaryngology - Head & Neck Surgery, University Health Network; University of Toronto
- Institute for Health Policy, Management and Evaluation, University of Toronto
| | - John N Waldon
- Department of Radiation Oncology, Princess Margaret Cancer Centre; University of Toronto
| | - Clifton David Fuller
- The University of Texas MD Anderson Cancer Center, Department of Radiaion Oncology
| | - Andrew J Hope
- Department of Radiation Oncology, Princess Margaret Cancer Centre; University of Toronto
| | - Salvatore L Ruggiero
- Department of Oral and Maxillofacial Surgery, Stony Brook University
- Hofstra North Shore-LIJ School of Medicine
| | | | - Ali A Hosni
- Department of Radiation Oncology, Princess Margaret Cancer Centre; University of Toronto
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Ritschl LM, Niu M, Pippich K, Schuh P, Rommel N, Fichter AM, Wolff KD, Weitz J. Superficial Temporal Artery and Vein as Alternative Recipient Vessels for Intraoral Reconstruction With Free Flaps to Avoid the Cervical Approach With the Resulting Need for Double Flap Transfer in Previously Treated Necks. Front Oncol 2022; 12:879086. [PMID: 35875163 PMCID: PMC9300821 DOI: 10.3389/fonc.2022.879086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Accepted: 06/10/2022] [Indexed: 11/28/2022] Open
Abstract
Background Microvascular reconstruction remains challenging in previously operated and irradiated patients, especially when double flaps seem to be the only solution due to osteoradionecrosis. An alternative reconstructive option could be microvascular anastomosis to the temporal vessels to avoid the obligatory cervical incision. Methods and Materials All consecutive cases between January 2013 and 2020 that underwent either mandibular resection and reconstruction with a free fibula flap (FFF) and another soft tissue flap (group I) or pure intraoral resection and reconstruction with an FFF or radial forearm flap (RFF) with temporal microvascular anastomosis (group II) were included. Patients’ general information, indication and extent of surgery, time of ischemia, time of total surgery, and duration of hospital stay as well as incidence of complications were retrospectively recorded and analyzed. Results Seventeen (group I) and 11 (group II) cases were included. In group I, FFF was combined with RFF (n = 9), anterolateral thigh flap (ALT, n = 7), or latissimus dorsi flap (n = 1). Group II consisted of six FFFs and five RFFs. Operation time and hospitalization duration were significantly shorter in group II (p < 0.001 and p = 0.025), whereas ischemic time of FFF was significantly shorter in group I (p = 0.002). All patients in group I required a tracheostomy, while only four cases in group II did (p = 0.004). The complication rate regarding hematoma removal, revision of anastomosis, flap loss, delirium, sepsis, pleural effusion, pneumonia, and pulmonary artery embolism showed no significant differences between the two groups. Conclusions The superficial temporal vessels served as versatile recipient vessels for intraoral mandibular and soft tissue reconstruction and led to reduced operation time, hospitalization duration, and indication for a primary tracheostomy. Thus, this approach may help to avoid cervical incision for reconstruction in irradiated patients.
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Affiliation(s)
- Lucas M. Ritschl
- Department of Oral and Maxillofacial Surgery, Klinikum rechts der Isar, School of Medicine, Technical University of Munich, Munich, Germany
- *Correspondence: Lucas M. Ritschl,
| | - Minli Niu
- Department of Oral and Maxillofacial Surgery, Klinikum rechts der Isar, School of Medicine, Technical University of Munich, Munich, Germany
| | - Katharina Pippich
- Department of Oral and Maxillofacial Surgery, Klinikum rechts der Isar, School of Medicine, Technical University of Munich, Munich, Germany
| | - Philia Schuh
- Department of Oral and Maxillofacial Surgery, Klinikum rechts der Isar, School of Medicine, Technical University of Munich, Munich, Germany
| | - Niklas Rommel
- Department of Oral and Maxillofacial Surgery, Klinikum rechts der Isar, School of Medicine, Technical University of Munich, Munich, Germany
| | - Andreas M. Fichter
- Department of Oral and Maxillofacial Surgery, Klinikum rechts der Isar, School of Medicine, Technical University of Munich, Munich, Germany
| | - Klaus-Dietrich Wolff
- Department of Oral and Maxillofacial Surgery, Klinikum rechts der Isar, School of Medicine, Technical University of Munich, Munich, Germany
| | - Jochen Weitz
- Department of Oral and Maxillofacial Surgery, Klinikum rechts der Isar, School of Medicine, Technical University of Munich, Munich, Germany
- Department of Oral and Maxillofacial Surgery, Josefinum, Augsburg and Private Practice Oral and Maxillofacial Surgery im Pferseepark, Augsburg, Germany
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Contrera KJ, Chinn SB, Weber RS, Roberts D, Myers JN, Lai SY, Lewis CM, Hessel AC, Gillenwater AM, Mulcahy CF, Yu P, Hanasono MM, Fuller CD, Chambers MS, Zafereo ME. Outcomes after definitive surgery for mandibular osteoradionecrosis. Head Neck 2022; 44:1313-1323. [PMID: 35238096 PMCID: PMC9081223 DOI: 10.1002/hed.27024] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 02/07/2022] [Accepted: 02/21/2022] [Indexed: 11/10/2022] Open
Abstract
OBJECTIVES To analyze charges, complications, survival, and functional outcomes for definitive surgery of mandibular osteoradionecrosis (ORN). MATERIALS AND METHODS Retrospective analysis of 76 patients who underwent segmental mandibulectomy with reconstruction from 2000 to 2009. RESULTS Complications occurred in 49 (65%) patients and were associated with preoperative drainage (odds ratio [OR] 4.40, 95% confidence interval [CI] 1.01-19.27). The adjusted median charge was $343 000, and higher charges were associated with double flap reconstruction (OR 8.15, 95% CI 2.19-30.29) and smoking (OR 5.91, 95% CI 1.69-20.72). Improved swallow was associated with age <67 years (OR 3.76, 95% CI 1.16-12.17) and preoperative swallow (OR 3.42, 95% CI 1.23-9.51). Five-year ORN-recurrence-free survival was 93% while overall survival was 63% and associated with pulmonary disease (HR [hazard ratio] 3.57, 95% CI 1.43-8.94). CONCLUSIONS Although recurrence of ORN is rare, surgical complications are common and charges are high. Poorer outcomes and higher charges are associated with preoperative factors.
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Affiliation(s)
- Kevin J. Contrera
- Department of Head and Neck Surgery, The University of Texas, MD Anderson Cancer Center, Houston, Texas, USA
- Department of Plastic and Reconstructive Surgery, The University of Texas, MD Anderson Cancer Center, Houston, Texas, USA
| | - Steven B. Chinn
- Department of Otolaryngology – Head and Neck Surgery, University of Michigan Hospital and Health Systems, Ann Arbor, Michigan, USA
| | - Randal S. Weber
- Department of Head and Neck Surgery, The University of Texas, MD Anderson Cancer Center, Houston, Texas, USA
| | - Dianna Roberts
- Department of Head and Neck Surgery, The University of Texas, MD Anderson Cancer Center, Houston, Texas, USA
| | - Jeffery N. Myers
- Department of Head and Neck Surgery, The University of Texas, MD Anderson Cancer Center, Houston, Texas, USA
| | - Stephen Y. Lai
- Department of Head and Neck Surgery, The University of Texas, MD Anderson Cancer Center, Houston, Texas, USA
- Department of Radiation Oncology, The University of Texas, MD Anderson Cancer Center, Houston, Texas, USA
| | - Carol M. Lewis
- Department of Head and Neck Surgery, The University of Texas, MD Anderson Cancer Center, Houston, Texas, USA
| | - Amy C. Hessel
- Department of Head and Neck Surgery, The University of Texas, MD Anderson Cancer Center, Houston, Texas, USA
| | - Ann M. Gillenwater
- Department of Head and Neck Surgery, The University of Texas, MD Anderson Cancer Center, Houston, Texas, USA
| | - Collin F. Mulcahy
- Department of Head and Neck Surgery, The University of Texas, MD Anderson Cancer Center, Houston, Texas, USA
| | - Peirong Yu
- Department of Plastic and Reconstructive Surgery, The University of Texas, MD Anderson Cancer Center, Houston, Texas, USA
| | - Matthew M. Hanasono
- Department of Plastic and Reconstructive Surgery, The University of Texas, MD Anderson Cancer Center, Houston, Texas, USA
| | - Clifton D. Fuller
- Department of Radiation Oncology, The University of Texas, MD Anderson Cancer Center, Houston, Texas, USA
| | - Mark S. Chambers
- Department of Head and Neck Surgery, The University of Texas, MD Anderson Cancer Center, Houston, Texas, USA
| | - Mark E. Zafereo
- Department of Head and Neck Surgery, The University of Texas, MD Anderson Cancer Center, Houston, Texas, USA
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Tadokoro Y, Hasegawa T, Takeda D, Murakami A, Yatagai N, Iwata E, Saito I, Kusumoto J, Akashi M. Factors Associated with Treatment Outcomes and Pathological Features in Patients with Osteoradionecrosis: A Retrospective Study. Int J Environ Res Public Health 2022; 19:ijerph19116565. [PMID: 35682149 PMCID: PMC9180928 DOI: 10.3390/ijerph19116565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 05/19/2022] [Accepted: 05/26/2022] [Indexed: 12/10/2022]
Abstract
A standard treatment for osteoradionecrosis (ORN) has not yet been established because of the diversity. Therefore, identifying the risk factors for a poor prognosis is essential. This study retrospectively investigated the factors associated with the prognosis of ORN in 68 patients. Relevant clinical data of all patients were obtained. Of the patients, 16 who underwent extensive surgery underwent histopathological analysis. The necrotic changes of the anterior and posterior margins in the cortical and cancellous bones were investigated. Multivariate analyses showed statistically significant associations between poor prognosis in patients with ORN and high radiation dose (hazard ratio [HR] 1.15), orocutaneous fistula (HR 2.93), and absence of sequestration (HR 2.49). Histopathological analysis showed a viable anterior margin of the middle portion of the cortical bone for all recovered cases; in contrast, most cases (75%) with a poor prognosis showed necrotic changes. The anterior margin of the cancellous bone was viable and resilient to high irradiation, regardless of the prognosis. These results suggest that patients with orocutaneous fistula should receive early surgical intervention, even if the affected area is limited or asymptomatic. In extensive surgery, a sufficient safety margin of necrotic bone, particularly in the anterior region, is required to improve the prognosis.
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