Bone Union of Osseous Microvascular Free Tissue Transfer in Mandibular Reconstruction

Objectives Osseous microvascular free tissue transfer (MFTT) is the gold standard for reconstruction for most segmental mandibulectomy defects. The most common osseous MFTT utilized in reconstruction is the fibular, scapular, and osteocutaneous radial forearm (OCRF) free flap. We evaluated postoperative bone union as well as clinical complications following MFTT and the impact of various patient and reconstructive characteristics, including type of osseous MFTT. Study Design Retrospective cohort study. Setting Tertiary care academic hospital. Methods This study examined patients who underwent osseous MFTT for mandibular defects from January 2017 to January 2019. Results An overall 144 osteotomies in 58 patients were evaluated. Of the 144 junctions, 28 (19.4%) showed radiographic nonunion. Patients who underwent preoperative (odds ratio [OR] = 0.30, P = .027) and postoperative (OR = 0.28, P = .003) radiation had a significantly lower bone union score. Time from surgery to postoperative imaging was associated with higher bone union scores (OR = 1.07, P = .024). When bone union scores were compared among types of MFTT, fibular (OR = 5.62, P = .008) and scapular (OR = 4.69, P = .043) MFTT had significantly higher scores than OCRF MFTT. Twelve (20.7%) patients had postoperative complications. There was no statistically significant correlation between clinical complications and various variables, including type of osseous MFTT. Conclusion Pre- and postoperative radiation and time from surgery have an impact on bone union. Regarding the type of MFTT, fibular and scapular MFTT appeared to have higher bone union when compared with OCRF. There was no impact of bone union or type of osseous MFTT on clinical complications.

Adverse Outcomes Following Free Tissue Transfer: A 3-year Experience From a Major Referral Centre

BackgroundFree tissue transfer encompasses a variety of techniques by which tissue is moved to another region of the body, with anastomosis of the divided artery and vein. Currently, success rates are reported at 91-99% [1], however, little is known regarding predictors for adverse outcomes.We aim at identifying predictors for negative outcomes following free flap surgery; and predict that elderly patients and patients with head and neck free flaps will have inferior outcomes due to comorbidity.MethodsThis is a retrospective case series. All free flap surgeries between 02/2018 to 02/2021 were identified using the electronic operation record system at Flinders Medical Centre. Chi squared hypothesis testing assessed patient factors and implications on outcome. Results67 patients of varying demographics were included in this study. The odds of wound infection was much higher in patients aged older than 65 (OR: 4.1 (95%CI 1.24-13.6, z-score: 2.31, p=0.017)). The odds of unplanned reoperation was also higher in this population (OR: 13.7 (95%CI 1.42-132.9, p=0.0053)). Free flap location was significant in determining whether patients would require a subsequent blood transfusion (p=0.0071). Head and neck patients did not experience a higher rate of adverse events.ConclusionPatients aged 65 and older are more likely to require treatment for infection and more often require reoperation because of flap related issues. Patients with limb free flaps are more likely to require transfusions. Head and neck patients did not have higher complication rates.

Bedside Neck Exploration for Venous Flow Coupler Signal Loss in Postoperative Free Tissue Transfer Monitoring

Objective To describe the role and efficacy of bedside neck exploration following free tissue transfer. Study Design Retrospective case series. Setting Single tertiary care institution. Methods A retrospective chart review was conducted of 353 patients who underwent free tissue transfer between January 2017 and April 2021. Bedside exploration was performed under mild sedation in patients who had loss of venous Doppler signal with equivocal clinical signs of venous insufficiency. Results A total of 11 patients underwent bedside assessment of the microvascular pedicle. In 6 cases, a return to the operating room was avoided. Five of these patients had coupler malfunction, and in 1 patient a venous kink was discovered and remedied at the bedside. Five patients required return to the operating room. Venous thrombosis requiring thrombectomy and revision of the venous anastomosis was discovered in 3 patients. One patient had a developing hematoma necessitating evacuation in the operating room, and 1 returned to the operating room due to sternocleidomastoid muscular compression of the venous pedicle. There were no flap failures within the study group. In all cases, broad-spectrum intravenous antibiotic coverage was prophylactically used, and no instances of wound infection were observed. Avoidance of returning to the operating room prevented an estimated $9222 of hospital charges per event. Conclusion Bedside neck exploration can be incorporated as a safe and cost-effective intermediary for definitive determination of need for return to the operating room.