Feasibility of a polydioxanone plate as an adjuvant material in rhinoplasty in Asians

Double Reinforcing Strategy with Perpendicular Plate of Ethmoid in Asian Secondary Unilateral Cleft Rhinoplasty: A Finite Element Analysis

BACKGROUND

Deviation and asymmetry relapse after secondary unilateral cleft rhinoplasty with septal extension graft is a common yet serious problem especially among Asian patients. Therefore, finding an effective approach to reduce deformity relapse remains a great challenge to plastic surgeons.

METHODS

In this study, authors established finite element models to simulate different nasal cartilage-corrected options and different reinforcing strategies in secondary unilateral cleft rhinoplasty. A load of 0.01N was given to the nasal tip to simulate the soft tissue pressure, while two loads of 0.5N were separately given to the anterior and posterior part of the septal extension graft to simulate the rhinoplasty condition. Maximum deformations were evaluated to make stability judgments.

RESULTS

The maximum deformation of different cartilage correction models in ascending order was: UCL deformity with septum correction, normal nasal cartilage, UCL nasal deformity, and UCL nasal deformity with lower lateral cartilage correction. When applied L-strut reinforcement graft was harvested from the perpendicular plate of the ethmoid bone, the maximum deformation of the models decreased significantly, and strong fixation of the septum could further enhance this decreasing effect.

CONCLUSIONS

Correcting the septum and lower lateral cartilage together could improve the structural stability and symmetry in secondary unilateral cleft rhinoplasty. To keep the corrected septum stable and thus reduce deformity relapse, reinforcing the L-strut with perpendicular plate of ethmoid graft while strongly anchoring the septal cartilage to the anterior nasal spine was proved to be effective in both finite element analysis and clinical observation.

LEVEL OF EVIDENCE IV

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Use of alloplastic implants for correction of deviated nasal septum: Systematic review and meta-analysis

PURPOSE

To systematically reviews the safety and effectiveness of alloplastic implants (AI) in septoplasty.

METHODS

We conducted a comprehensive search in Medline, EMBASE, SCOPUS, CINAHL, and Cochrane Library databases to identify articles on septoplasty using AI. We also manually searched reference lists of included articles. Inclusion criteria involved prospective or retrospective case-series studies of adults with deviated nasal septum (DNS) who underwent septoplasty with AI, with sufficient follow-up data. Two authors independently screened articles, reviewed full manuscripts, and extracted data.

RESULTS

Out of 5370 articles, 16 met inclusion criteria, encompassing 884 patients from 14 eligible studies. Most studies had fair quality. AI materials included Polydioxanone (PDS), Polycaprolactone (PCL), Titanium, Macropore, and PolyMax. AI usage improved nasal obstruction in most patients, with 95.6 % (84.8 %-100 %) based on physical examination and 96.9 % (89.6 %-100 %) based on symptoms. AI-related complications occurred in 4.3 % (0 %-12.8 %) of cases, mostly non-serious.

CONCLUSIONS

AI use can be considered as a useful adjunct in septoplasty, with uncommon complications similar to standard procedures. However, due to limited-quality evidence, further prospective controlled studies are needed.

Cleft lip and palate outcomes: Multidisciplinary approach for comprehensive management

In patients with cleft lip and palate the most common associated dental problem is lateral incisor agenesis, often associated with lack of support and definition of the nasal tip. In many cases, adhesions deriving from surgical procedures and skeletal discrepancy make orthognathic surgery and rhinoseptoplasty unavoidable. In the present case report a dental rehabilitation with canine substitution and prosthetic-implant treatment in a posterior area is described. The use, during rhinoseptoplasty, of a customized titanium prosthesis, which provides projection for the tip of the nose, is also introduced. The patient was administered two questionnaires in order to assess the psychological aspects related to the cleft outcomes and the influence that the treatment conveyed.

Polydioxanone Enhances Bone Regeneration After Resection and Reconstruction of Rat Femur with rhBMP2

The aim of this study was to assess the bone regeneration potential of a polydioxanone (PDO) scaffold together with recombinant human bone morphogenetic protein-2 (rhBMP-2) for the reconstruction of large bone defect. In total, 24 male rats (6 months old) were subjected to bilateral femoral stabilization using titanium plates to create a 2 mm gap, and reconstruction using rhBMP-2 (Infuse®; 3.25 μg). The bone defects were covered with PDO (PDO group), or with titanium mesh (Ti group). Animals were euthanized on days 14 and 60. Simultaneously, 16 rats received PDO and Ti in their dorsum for the purpose of biocompatibility analysis at 3, 5, 7, and 10 days postoperatively. X-ray densitometry showed a higher density in the PDO group on day 14. On day 60, coverage of the bone defect with PDO showed a larger quantity of newly formed bone than that found for the Ti group, a lower inflammatory infiltrate value, and a more significant number of blood vessels on day 14. By immunohistochemical assessment, runt-related transcription factor 2 (RUNX2) and osteocalcin (OCN) showed higher labeling on day 14 in the PDO group. On day 60, bone morphogenetic protein-2 (BMP-2) showed higher labeling in the PDO group, whereas Ti showed higher labeling for osteoprotegerin, nuclear factor kappa B ligand-activating receptor, RUNX2, and OCN. Furthermore, biocompatibility analysis showed a higher inflammatory response in the Ti group. The PDO scaffold enhanced bone regeneration when associated with rhBMP-2 in rat femur reconstruction. Impact statement Regeneration of segmental bone defects is a difficult task, and several techniques and materials have been used. Recent advances in the production of synthetic polymers, such as polydioxanone (PDO), produced by three-dimensional printing, have shown distinct characteristics that could improve tissue regeneration even in an important bone defect. The present preclinical study showed that PDO membranes used as scaffolds to carry recombinant human bone morphogenetic protein-2 (rhBMP-2) improved bone tissue regeneration by more than 8-fold when compared with titanium mesh, suggesting that PDO membranes could be a feasible and useful material for use in guided bone regeneration. (In English, viable is only used for living creatures capable of sustaining life.

Secondary Cleft Rhinoplasty: A National Survey of Surgical Practice by Accredited Cleft Palate Teams

Patients with cleft lip often undergo a primary rhinoplasty at the time of lip repair, and further surgical correction with secondary cleft rhinoplasty (SCR) is often warranted for improved form and function. The purpose of this study was to better elucidate current practice patterns and trends for how SCR is performed in the United States.

METHODS

We administered a survey to team surgeons affiliated with cleft lip and palate care teams approved by the American Cleft Palate Craniofacial Association (ACPA).

RESULTS

We received responses from 40 ACPA-approved teams for a response rate of 20.7%, with 59 total ACPA team surgeons completing the survey. 88.1% of surgeons perform intermediate cleft rhinoplasties. Among those who perform an intermediate cleft rhinoplasty, the mean age at which they would first consider the procedure is 5.83±2.66 years. The mean age for consideration of definitive cleft rhinoplasty was 15.86 ± 1.73 years. In both unilateral and bilateral cleft lips, a closed approach was more common in intermediate rhinoplasty, while an open approach was more common in definitive rhinoplasty (P < 0.001). The use of autologous grafts was more common in definitive rhinoplasty (P < 0.001), with 65% of respondents utilizing autologous grafts in greater than three-quarters of their procedures.

CONCLUSIONS

When comparing intermediate with definitive cleft rhinoplasty, we found significant increase in the use of open techniques, autologous cartilage use for augmentation of the nasal tip, dorsal nasal support, and columellar sup- port. The considerable variability among surgeons highlights the lack of consensus regarding SCR.

Nasal Septal Perforation Reconstruction with Polydioxanone Plate: A Systematic Review

Nasal septal perforation is an uncommon pathology that is difficult to surgically repair and may significantly impact patients' quality of life. Existing treatments have high complication and failure rates. The use of polydioxanone (PDS) plates to repair septal perforations is an innovative approach that has demonstrated superior outcomes to the conventional techniques. This study aimed to review the literature on PDS plates for nasal septal perforation reconstruction. PubMed, OVID Medline, and OVID Embase databases were searched for relevant articles in June 2021. Search terms included nasal septal perforation, polydioxanone, septal perforation, septal repair, nasal septum, and PDS plate. The Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA) guidelines were adhered to for this systematic review. Database searches yielded 80 articles. Seven articles were included representing 74 patients. All studies reported the use of PDS plates in addition to other materials. They all reported closure rates of at least 80%. The majority of studies reported no postoperative complications. Nasal septal perforation reconstruction with PDS plates is a promising approach that has demonstrated positive outcomes. Further larger studies are required to evaluate the long-term efficacy of using PDS plates on patients with septal perforations.

Nasal Reconstruction of a Frontonasal Dysplasia via Septal L-Strut Reconstruction Using Costal Cartilage

OBJECTIVE

Frontonasal dysplasia (FND) is a rare congenital condition. Its major features include hypertelorism, a large and bifid nasal tip, and a broad nasal root. We present our technique of septal L-strut reconstruction using costal cartilage.

DESIGN

Retrospective review from June 2008 and August 2017.

METHODS

Under general anesthesia, 6 patients with FND underwent septal reconstruction using costal cartilage via open rhinoplasty. We reconstructed the nasal and septal cartilaginous framework by placing columellar struts and cantilever-type grafts.

RESULTS

The patients ranged in age from 6 to 13 years old. All were female. The follow-up period ranged from 8 months to 2 years; we encountered no postoperative complications (infection, nasal obstruction, or recurrence). All patients were satisfied with their nasal appearance.

CONCLUSIONS

Although the results were not entirely satisfactory from an esthetic point of view, we found that FND can be treated via septal reconstruction with costal cartilage and that the clinical outcomes are reliable and satisfactory. Our approach is a useful option for FND patients.

Biomechanical analysis of a modified suture technique for septal extension grafts: Transloop suture

BACKGROUND

A successful rhinoplasty procedure requires a well-defined and properly projected nasal tip; however, surgical control of the nasal tip is difficult. The aim of this investigation was to assess the efficacy and safety of a modified suture technique, which can be used to fix the caudal septal extension graft during primary rhinoplasty of the Asian population and revision septorhinoplasties of the Caucasian population, and to compare it with those of other commonly used techniques.

METHODS

After peeling of perichondrium of scapular cartilages, cartilage pieces of 3 × 1 cm in size and 2 mm in thickness were divided into two from the midline. These pieces were repaired end-to-end using three different repair techniques: two simple interrupted in Group A (n = 40), vertical figure-of-eight in Group B (n = 40) and modified vertical figure-of-eight (transloop) in Group C (n = 40). All repaired cartilage specimens were subjected to a biomechanical analysis, in which four different forces were applied: tension, lateral bending, shearing and buckling.

RESULTS

According to the tensile test, Group C had statistically significantly higher strength than Group A at 2 mm range. The lateral bending test similarly revealed that Group C had statistically significantly higher strength at 1.5 mm and 2 mm range than Group A. However, there was no statistically significant difference between the three groups in the assessment of shearing and buckling forces.

CONCLUSION

The modified transloop suture technique provides a more stable repair, and we consider that it can be used as an alternative suture repair method.