Oronasal Fistula Incidence Associated With Vomer Flap Repair of Cleft Palate: A Systematic Review and Meta-Analysis

Dehiscence and Fistula Formation Following Anterior Palatal Reconstruction With Vomer Flap

BACKGROUND AND PURPOSE

Anterior palatal reconstruction using vomer flaps has been described during primary cleft lip repair. In this procedure, the mucoperiosteal tissue of the vomer is elevated to reconstruct the nasal mucosa overlying the cleft of the hard palate. Here the authors, evaluate the efficacy of a technique in which a superiorly based vomer flap is sutured to the lateral nasal mucosa. The authors assess vomer flap dehiscence rates and compare the likelihood of fistula development in this cohort to patients who underwent palatoplasty without vomer flap reconstruction.

METHODS

A retrospective chart review was conducted of all palatoplasties performed by the senior author at an academic institution during a 7-year period. Medical records were reviewed for demographic variables, operative characteristics, and postoperative complications up to 1 year following surgery. Logistic regression analysis was conducted to assess the effects of vomer flap reconstruction on fistula formation, adjusting for age and sex.

RESULTS

Fifty-eight (N=58) patients met the inclusion criteria. Of these, 38 patients (control group) underwent cleft palate reconstruction without previous vomer flap placement. The remaining 20 patients underwent cleft lip repair with vomer flap reconstruction before palatoplasty (vomer flap group). When bilateral cases were counted independently, 25 total vomer flap reconstructions were performed. Seventeen of these 25 vomer flap reconstructions (68%) were completely dehisced by the time of cleft palate repair. In the vomer flap group, 3 of the 20 patients (15%) developed fistulas in the anterior hard palate following the subsequent palatoplasty procedure. In the control group, only 1 of the 38 patients (2.6%) developed a fistula in the anterior hard palate. There was no significant association between cohorts and the development of anterior hard palate fistulas [odds ratio=10.88, 95% confidence interval (0.99-297.77) P =0.07], although analysis was limited by low statistical power due to the small sample size.

CONCLUSIONS

In our patient population, anterior palatal reconstruction using a superiorly based vomer flap technique was associated with complete dehiscence in 68% of cases. Fistula formation in the anterior hard palate was also proportionately higher following initial vomer flap reconstruction (15% versus 2.6%). These results prompted the senior author to adjust his surgical technique to 1 in which the vomer flap overlaps the oral mucosa. While follow-up from these adjusted vomer flap reconstruction cases remains ongoing, early evidence suggests a reduced requirement for surgical revision following implementation of the modified technique.

Three-dimensional finite element analysis on stress distribution after different palatoplasty and levator veli palatini muscle reconstruction

OBJECTIVES

To establish a three-dimensional finite element model of the upper palate, pharyngeal cavity, and levator veli palatini muscle in patients with unilateral complete cleft palate, simulate two surgical procedures that the two-flap method and Furlow reverse double Z method, observe the stress distribution of the upper palate soft tissue and changes in pharyngeal cavity area after different surgical methods, and verify the accuracy of the model by reconstructing and measuring the levator veli palatini muscle.

MATERIALS AND METHODS

Mimics, Geomagic, Ansys, and Hypermesh were applied to establish three-dimensional finite element models of the pharyngeal cavity, upper palate, and levator veli palatini muscle in patients with unilateral complete cleft palate. The parameters including length, angle, and cross-sectional area of the levator veli palatini muscle etc. were measured in Mimics, and two surgical procedures that two-flap method and Furlow reverse double Z method were simulated in Ansys, and the area of pharyngeal cavity was measured by hypermesh.

RESULTS

A three-dimensional finite element model of the upper palate, pharyngeal cavity, and bilateral levator veli palatini muscle was established in patients with unilateral complete cleft palate ; The concept of horizontal projection characteristics of the palatal dome was applied to the finite element simulation of cleft palate surgery, vividly simulating the displacement and elastic stretching of the two flap method and Furlow reverse double Z method during the surgical process; The areas with the highest stress in the two-flap method and Furlow reverse double Z method both occur in the hard soft palate junction area; In resting state, as measured, the two flap method can narrow the pharyngeal cavity area by 50.9%, while the Furlow reverse double Z method can narrow the pharyngeal cavity area by 65.4%; The measurement results of the levator veli palatini muscle showed no significant difference compared to previous studies, confirming the accuracy of the model.

CONCLUSIONS

The finite element method was used to establish a model to simulate the surgical procedure, which is effective and reliable. The area with the highest postoperative stress for both methods is the hard soft palate junction area, and the stress of the Furlow reverse double Z method is lower than that of the two-flap method. The anatomical conditions of pharyngeal cavity of Furlow reverse double Z method are better than that of two-flap method in the resting state.

CLINICAL RELEVANCE

This article uses three-dimensional finite element method to simulate the commonly used two-flap method and Furlow reverse double Z method in clinical cleft palate surgery, and analyzes the stress distribution characteristics and changes in pharyngeal cavity area of the two surgical methods, in order to provide a theoretical basis for the surgeon to choose the surgical method and reduce the occurrence of complications.

Two-stage palatal repair in non-syndromic CLP patients using anterior to posterior closure is associated with minimal need for secondary palatal surgery

OBJECTIVE

The aim of the present study was to assess the need for secondary palatal corrective surgery in a concept of palate repair that uses a protocol of anterior to posterior closure of primary palate, hard palate and soft palate.

METHODS

A data base of patients primarily operated between 2001 and 2021 at the Craniofacial and Cleft Care Center of the University Goettingen was evaluated. Cleft lips had been repaired using Tennison Randall and Veau-Cronin procedures in conjunction with alveolar cleft repair. Cleft palate repair in CLP patients was accomplished in two steps with repair of primary palate and hard palate first using vomer flaps at the age of 10-12 months and subsequent soft palate closure using Veau/two-flap procedures 3 months later. Isolated cleft palate repair was performed in a one-stage operation using Veau/two-flap procedures. Data on age, sex, type of cleft, date and type of surgery, occurrence and location of oronasal fistulae, date and type of secondary surgery performed for correction of oronasal fistula (ONF)and / or Velophyaryngeal Insufficiency (VPI) were extracted. The rate of skeletal corrective surgery was registered as a proxy for surgery induced facial growth disturbance.

RESULTS

In the 195 patients with non-syndromic complete CLP evaluated, a total number of 446 operations had been performed for repair of alveolar cleft and cleft palate repair (Veau I through IV). In 1 patient (0,5%), an ONF occurred requiring secondary repair. Moreover, secondary surgery for correction of VPI was required in 1 patient (0,5%) resulting in an overall rate of 1% of secondary palatal surgery. Skeletal corrective surgery was indicated in 6 patients (19,3%) with complete CLP in the age group of 15 - 22 years (n = 31).

CONCLUSIONS

The presented data have shown that two-step sequential cleft palate closure of primary palate and hard palate first followed by soft palate closure has been associated with minimal rate of secondary corrective surgery for ONF and VPI at a relatively low need for surgical skeletal correction.

Unraveling a Major Burden of Orofacial Clefts Analyses: Classification of Cleft Palate Fistulas by Cleft Surgeons

OBJECTIVE

The objective of this study was to investigate how cleft surgeons classify palatal fistulas. We focused on three different anatomical locations (ie, hard palate, soft palate, junction hard/soft palate) to analyze agreement/disagreement at various anatomical locations.

DESIGN

Cross-sectional survey study.

PARTICIPANTS

Participants in an international webinar that focused on palatal fistula treatment were included.

INTERVENTION

Participants were presented with a survey pre- and post-webinar.

MAIN OUTCOMES

Frequency of used classification systems for classifying oronasal fistulas and the inter-rater reliability of the Pittsburgh classification system.

RESULTS

A total of 141 participants completed the questionnaires prior to the webinar and 109 participants completed the survey after the webinar. In total, four classification systems were used (ie, Pittsburgh, Pakistan Comprehensive Fistula Classification [PCFC], anatomical and 'other'). The Pittsburgh classification was the most commonly used system in all cases. However, Pittsburgh inter-rater reliability was low (κ = 0.136 pre-webinar, and κ = 0.174 post-webinar). Surprisingly, a substantial shift was observed from the anatomical to Pittsburgh classification after the webinar, indicating increased awareness of the usability of the Pittsburgh classification system.

CONCLUSIONS

This study demonstrates a large heterogeneity with regards to the classification of cleft palate fistulas. Interestingly, a shift was observed from the anatomical to Pittsburgh classification after the webinar. However, the inter-rater reliability for using the Pittsburgh classification was low. Classifying palatal fistulas in a homogenous fashion could enhance comparison of primary palate repair and could improve treatment of palatal fistulas.

Evidence Mapping and Quality Analysis of Systematic Reviews on Various Aspects Related to Cleft Lip and Palate

BACKGROUND

Management of cleft lip and palate is interdisciplinary. An evidence-mapping approach was envisaged to highlight the existing gaps in this field, using only the highest level of evidence.

OBJECTIVES

To conduct evidence mapping and quality analysis of systematic reviews and meta-analyses related to any aspect of cleft lip and palate.

SEARCH METHODS

The cleft lip and palate field was divided into 9 domains and 50 subdomains and a method of categorization of systematic reviews was established. A comprehensive search strategy was carried out in seven databases along with the search of gray literature and references of included articles.

SELECTION CRITERIA

Systematic reviews related to any aspect of cleft lip and palate, conducted by a minimum of two reviewers, with a comprehensive search strategy and adequate quality analysis were included.

DATA COLLECTION AND ANALYSIS

A self-designed, pre-piloted data-extraction sheet was used to collect information that was analyzed through an expert group discussion. Quality analysis was performed using ROBIS-I, AMSTAR 2, and the PRISMA checklist.

RESULTS

A total of 144 systematic reviews published between 2008 and 2022 were included. The largest number of these could be categorized in the therapeutic domain (n = 58). A total of 27% of the studies were categorized as inconclusive, 40% as partially conclusive, and 33% as conclusive. As per ROBIS-I, 77% of reviews had high risk of bias while 58% were graded as critically low in quality as per AMSTAR 2. The majority of systematic reviews showed low reporting errors.

CONCLUSIONS

The majority of systematic reviews related to cleft lip and palate relate to therapeutic and prognostic domains and show high risk of bias and critically low quality regardless of the source journal. The results of this paper might serve as a starting point encouraging authors to carry out high-quality research where evidence is lacking.

REGISTRATION

A multidisciplinary expert-group formulated an a priori protocol, registered in Open Science Framework (DOI 10.17605/OSF.IO/NQDV2).

Off-Label Treatment for Severe Craniomaxillofacial Fractures in Low-Income Countries-A Novel Operation Method with the External Face Fixator

Introduction: Craniomaxillofacial fractures (CMF) are common in low-income countries (LIC). Due to limited resources, treatment of these fractures usually consists of interdental wiring or immobilization with a Barton bandage to maintain the reduction by permanent occlusion. These non-surgical treatment methods often lead to unsatisfactory results, such as a disturbed dental occlusion and lockjaw. The aim of this study is to present an off-label treatment option for CMF by applying a hand fixator as external face fixator (EFF) and to demonstrate the surgical method in detail. Materials and Methods: The feasibility and postoperative outcomes of this new off-label operation technique were evaluated by analyzing patients with CMF (n = 13) treated at an NGO hospital in Sierra Leone between 2015 and 2019. Results: The application of the EFF was feasible. The biggest advantage compared to the conventional non-operative methods was, that a dynamic occlusion was still possible during the 6 weeks healing period. Hence, patients could eat and drink almost normally and perform dental hygiene with the EFF in place. We did not discover pintrack infections or other complications. Three patients developed an oronasal fistula due to traumatic a palatal bone loss of about 7–8 mm which was treated by a palatal mucoperiosteal flap 15–20 days after the first operation. Discussion and Conclusions: In LIC, where plate osteosynthesis for CMF cannot be performed due to limited resources the application of an EFF is a promising alternative for a better outcome and an improved quality of life for the patients.