The use of the rib grafts in head and neck reconstruction

Adaptive Mechanism for Designing a Personalized Cranial Implant and Its 3D Printing Using PEEK

The rehabilitation of the skull’s bones is a difficult process that poses a challenge to the surgical team. Due to the range of design methods and the availability of materials, the main concerns are the implant design and material selection. Mirror-image reconstruction is one of the widely used implant reconstruction techniques, but it is not a feasible option in asymmetrical regions. The ideal design approach and material should result in an implant outcome that is compact, easy to fit, resilient, and provides the perfect aesthetic and functional outcomes irrespective of the location. The design technique for the making of the personalized implant must be easy to use and independent of the defect’s position on the skull. As a result, this article proposes a hybrid system that incorporates computer tomography acquisition, an adaptive design (or modeling) scheme, computational analysis, and accuracy assessment. The newly developed hybrid approach aims to obtain ideal cranial implants that are unique to each patient and defect. Polyetheretherketone (PEEK) is chosen to fabricate the implant because it is a viable alternative to titanium implants for personalized implants, and because it is simpler to use, lighter, and sturdy enough to shield the brain. The aesthetic result or the fitting accuracy is adequate, with a maximum deviation of 0.59 mm in the outside direction. The results of the biomechanical analysis demonstrate that the maximum Von Mises stress (8.15 MPa), Von Mises strain (0.002), and deformation (0.18 mm) are all extremely low, and the factor of safety is reasonably high, highlighting the implant’s load resistance potential and safety under high loading. Moreover, the time it takes to develop an implant model for any cranial defect using the proposed modeling scheme is very fast, at around one hour. This study illustrates that the utilized 3D reconstruction method and PEEK material would minimize time-consuming alterations while also improving the implant’s fit, stability, and strength.

Autologous costochondral graft harvest in children

INTRODUCTION

Autologous costochondral grafting is a commonly employed technique in pediatric otolaryngology for reconstructing a cartilaginous or bony structure, such as the trachea, larynx, nose or mandible by harvesting rib cartilage or bone from the same patient. Complications include infection, pneumothorax, hematoma, scarring, and pleural leak, and the literature regarding these complication rates in pediatric patients undergoing this procedure is sparse. The objective of this study was to determine the donor site complication rate associated with rib graft harvest procedures performed by pediatric otolaryngologists in infants and children and to compare this to established complication rates reported in adults.

METHODS

A retrospective cohort study was performed, examing the charts of 33 patients who underwent airway, mandible, nose, or external ear reconstruction by means of autologous rib grafting between 2010 and 2018 at an urban tertiary medical center in Boston, Massachusetts. All patients were under the age of 18 years old and had undergone rib harvest and subsequent airway, mandible, nose, or external ear reconstruction by two pediatric otolaryngologists.

RESULTS

Of these, 20 were female and 13 were male, with a mean age of 2.5 years at date of surgery. No patients were excluded. A total of 41 costochondral graft harvests from a total of 36 incision sites were included. Pooled donor site complication incidences were 1 intraoperative pleural leak (2.8%) and 1 incision site infection (2.8%). Drains were not utilized postoperatively; there were no incidences of postoperative hematoma or seroma. No outside specialty consults were necessary to manage these. There were 2 instances of hypertrophic scarring, both developing in patients who underwent skin excisions for skin graft harvest or scar excision from the same incision used for graft harvest (5.6%).

CONCLUSIONS AND RELEVANCE

Autologous rib grafting amounts to a simple, extrapleural chest wall procedure, which may be safely performed in children by pediatric otolaryngologists with acceptably low complication rates.

3D printing for tissue engineering in otolaryngology

Airway and other head and neck disorders affect hundreds of thousands of patients each year and most require surgical intervention. Among these, congenital deformity that affects newborns is particularly serious and can be life-threatening. In these cases, reconstructive surgery is resolutive but bears significant limitations, including the donor site morbidity and limited available tissue. In this context, tissue engineering represents a promising alternative approach for the surgical treatment of otolaryngologic disorders. In particular, 3D printing coupled with advanced imaging technologies offers the unique opportunity to reproduce the complex anatomy of native ear, nose, and throat, with its import in terms of functionality as well as aesthetics and the associated patient well-being. In this review, we provide a general overview of the main ear, nose and throat disorders and focus on the most recent scientific literature on 3D printing and bioprinting for their treatment.

A 5-year audit of major maxillofacial surgeries at Usmanu Danfodiyo university teaching hospital, Nigeria

Background

There is a paucity of data on the pattern of oral and maxillofacial surgeries done in Nigeria. Despite the rising prominence of oral and maxillofacial surgery as a specialty in our immediate environment, no published audit of the surgeries performed exist. This study aims to present the pattern and types of major surgeries done by oral and maxillofacial surgeons in our hospital as well as the indications for such surgeries. It is hoped that the findings will assist in formulating informed policies and improving healthcare delivery.

Methods

A review of hospital records of all patients who had major oral and maxillofacial surgeries at Usmanu Danfodiyo University Teaching Hospital from January, 2013 to August, 2017 was done. Descriptive statistics such biodata, indication for surgery and type of surgery were recorded and analyzed using the IBM SPSS statistics for windows version 20 (Armonk, NY: IBM Corp) software.

Results

One hundred and forty six individuals who underwent 158 major surgeries under general anaesthesia were included. There were 82 males and 64 females, giving a male/female ratio of 1.3: 1. The ages ranged from 3 months to 81 years [median of 33 years]. Tumours and tumour-like lesions were the major indications for surgery [85 (58.2%)]. The most commonly performed surgery was mandibulectomy [31 (19.6%)], followed by Open Reduction and Internal Fixation (ORIF) [29 (18.4%)].

Conclusion

Major oral and maxillofacial surgeries are common in our environment. The frequencies of these surgeries can increase with better healthcare financing and universal availability of health insurance schemes. Efforts aimed at reducing the incidence of tumours should be instituted.