Antiresorptive therapy in combination with radiation results in enhanced risk for necrosis and associated complicatifions.

OBJECTIVE: Patients exposed to a combination of antiresorptive medication and radiotherapy of the head and neck area developing necrosis of the jaw in the course of treatment are extremely rare. Therefore, the aim of this study was to identify the outcome and complications in this highly vulnerable patient cohort. STUDY DESIGN: Seventeen patients who received both antiresorptive treatment and radiotherapy (medication-related osteonecrosis of the jaw/osteoradionecrosis = the [MRONJ/ORN] group) in the head and neck area were enrolled in this study. Included patients were treated in our department between 2005 and 2022. Four hundred twenty-four patients with MRONJ (the MRONJ group) and 138 patients with ORN of the jaw were enrolled as two control groups (the ORN group). Demographic data, lesion localization, date of primary diagnosis, clinical symptoms, type of therapy (surgical or non-surgical), details on antiresorptive treatment, outcome, and complications were recorded. RESULTS: Pathological fractures, continuity resection, and recurrence appear more often in patients who receive a combination of antiresorptive treatment and radiotherapy in the head and neck area compared with patients undergoing only one of these treatments. There was a statistically significant difference (P < .001) between the MRONJ/ORN group and the MRONJ group and the MRONJ/ORN group and the ORN group considering recurrence, fracture, and continuity resection. Patients with ORN combined with MRONJ have a 4-times higher risk for developing recurrence compared with patients with MRONJ and a 1.5-times higher risk for recurrence compared with patients with ORN. Jaw fracture and continuity resection appear more often in patients with MRONJ/ORN. CONCLUSIONS: Patients under antiresorptive therapy in combination with radiation therapy in the head and neck area have a higher risk for developing complications in case of osteonecrosis of the jaw. Therefore, a strict follow-up care schedule is highly recommended.

Prognostic role of lymph node micrometastasis in oral and oropharyngeal cancer: A systematic review.

BACKGROUND: An estimated 20% of patients with oral and oropharyngeal squamous cell carcinoma (OOSCC) have micrometastases (Mi) or isolated tumor cells (ITC) in the cervical lymph nodes that evade detection by standard histological evaluation of lymph node sections. Lymph node Mi and ITC could be one reason for regional recurrence after neck dissection. The aim of this study was to review the existing data regarding the impact of Mi on the survival of patients with OOSCC. METHODS: PubMed and the Cochrane Library were searched for articles reporting the impact of Mi and ITC on patient survival. Two authors independently assessed the methodological quality of retrieved studies using the Downs and Black index. Data were also extracted on study type, number of included patients, mode of histological analysis, statistical analysis, and prognostic impact. RESULTS: Sixteen articles with a total of 2064 patients were included in the review. Among the 16 included studies, eight revealed a statistically significant impact of Mi on at least one endpoint in the Kaplan-Meier and/or multivariate analysis. Three studies regarded Mi as Ma, while five studies found no impact of Mi on survival. Only one study demonstrated an impact of ITC on patient's prognosis in the univariate but not in the multivariate analysis. CONCLUSION: The majority of cases included in the review were patients with oral cancer. The findings provide low-certainty evidence that Mi negatively impacts survival. Data on ITC were scarcer, so no conclusions can be drawn about their effect on survival. The lower threshold to discriminate between Mi and ITC should be defined for OOSCC since the existing thresholds are based on data from different tumors. The histological, immunohistological, and anatomical characteristics of Mi and ITC in OOSCC as well as the effect of radiotherapy on Mi should be further investigated separately for oral and oropharyngeal carcinomas.

X-Linked Hypophosphatemia: Does Targeted Therapy Modify Dental Impairment?

X-linked hypophosphatemia is a rare, hereditary disorder that significant influences teeth and alveolar bone. The first clinical sign leading to the diagnosis of X-linked hypophosphatemia is often dental impairment with dental abscesses and dentin mineralization defects. Genetic analysis helped find the responsible gene and therefore opened up new ways of therapeutically managing X-linked hypophosphatemia. The human monoclonal antibody Burosumab represents a milestone in the targeted therapy of this hereditary disease by directly addressing its pathophysiology. Targeted therapy has been shown to improve skeletal impairment, pain, and phosphate metabolism. However, the influence of this new therapy on dental impairment has only been addressed in a few recent studies with varying results. Therefore, in this review, we aim to summarize the dental phenotype and analyze the different treatment modalities with a focus on dental impairment.

New insights into redox-related risk factors and therapeutic targets in oral squamous cell carcinoma.

Oral squamous cell carcinoma (OSCC) is the most common cancer in the oral cavity accounting for 90 % of oral cancer with a global incidence of 350.000 new cases per year. Curative resection along with adjuvant radiation therapy or a combination of radiotherapy with chemotherapy remain as gold standard in treating OSCC. Still, local recurrence, lymph nodal recurrence, and complications of radiation remain the main cause of tumor-related mortality. Reactive oxygen species are not only correlated to the etiology of OSCC due to oxidative DNA damage, lipid peroxidation or effecting signal transduction cascades that effect cell proliferation and tumorigenesis, but are also of great interest in the therapy of OSCC patients. As induced oxidative stress can be used therapeutically for the induction of tumor cell death, redox targets might be a therapeutic addition to the conventional treatment options. In this review, we discuss markers of impaired redox homeostasis as well as potential redox-related treatment targets in OSCC.

Comparison of histopathological margins after resection of oral squamous cell carcinoma using sharp dissection versus mono-polar electrocautery in T1 and T2 tumors.

The study aims to compare histopathological margins after resection of oral squamous cell carcinoma (OSCC) with different surgical techniques: conventional sharp resection (SR) with scalpel versus monopolar electrocautery (ME). Hence, the question arises whether thermal damage by performing monopolar electrocautery surgery will lead to close margins more frequently than by using scalpels. 152 patients were included in this study. All patients received a primary tumor resection either performed with SR or with ME. Surgical margins were distributed into two groups: ≥5 mm (clear margins) and < 5 mm (close or involved margins). For comparing homogeneous groups, we considered tumor localizations, diameter and depth of invasion. The results were statistically analyzed by applying the Wilcoxon-Mann-Whitney-U-Test. The distribution of tumor diameter and depth of invasion was equal in both groups. There was no statistically significant difference between the amount of free surgical margins using SR or ME (p = 0.884). According to this study, the use of the monopolar electrocautery for tumor resection in the oral cavity does not increase the rate of compromised resection margins compared to the conventional scalpel.

Comparison of alternative N-staging models in patients with oral cancer. Is nodal yield or burden the most critical parameter?

BACKGROUND: There is increasing evidence in the literature that alternative N-classification systems offer a simpler and more precise risk stratification than the current N- classification in patients with oral squamous cell carcinoma. The purpose of this study is to compare three broadly proposed models incorporating lymph node ratio, log odds of positive lymph nodes and number of positive lymph nodes regarding disease-free and overall survival. METHODS: This is a retrospective study of patients treated in a single center between 2013 and 2019. Cox proportional hazard models, Kaplan Meier curves, the long rank test and the area under the curve were implemented to compare the risk-stratification ability of the three models. Moreover, a hazard ratio plot was calculated to investigate the association between nodal yield and disease-free survival. RESULTS: 231 patients were included. All three proposed N-models were significantly correlated to the patient's prognosis in the multivariate analysis. Pairwise comparisons between the groups showed that the current pN classification offers the worst stratification and that the model incorporating the number of positive lymph nodes had a better performance for predicting both endpoints. Finally, a decrease in hazard ratio was observed with each additional lymph node removed up to the number of 39 lymph nodes. CONCLUSIONS: The model incorporating the nodal burden offered a better predictive ability. The current N-classification cannot adequately identify patients with different prognosis. A non-linear relationship was found between nodal yield and survival, which could be the disadvantage of the lymph node ratio and log odds models.

Metastases of OSCC Based on Oral Lichen Ruber Planus.

Oral lichen ruber planus (OLP) is a poorly understood chronically inflammatory disease of the oral mucosa. Malignant transformation into oral squamous cell carcinoma (OSCC) is reported in between 1-2% of cases in the literature. After malignant transformation, surgical treatment-meaning tumor resection combined with neck dissection-is recommended. The recommended extent of treatment is controversial in the literature because this kind of OSCC is often a highly differentiated tumor with a lower risk for lymph nodal spreading. This study aims to overview 103 patients treated in our department due to OLP. The primary outcome parameter was the development of metastases in OLP patients compared to a group of OSCC patients without OLP and the comparison of survival in between both groups. Statistical analysis showed a significantly lower risk for patients with OSCC and with OLP for lymph nodal spreading (p = 0.013). Patients with OSCC and without OLP had a 4.76-higher risk for lymph nodal spreading. On the other hand, second metachronous tumor occurred more often in patients with OSCC and OLP. Overall, OSCC based on OLP occurs more often in female patients, is more highly differentiated and comes with a lower risk for metastases but has a higher risk for second metachronous tumors. Therefore, special attention should be paid to patients with OSCC based on OLP when planning adjuvant therapy and clinical follow-up. The indication for postoperative radiation should be made cautiously in this case, and clinical controls should be performed more closely due to the risk of recurrent disease or tumors at different locations.

Fibrous Dysplasia of the Jaw: Advances in Imaging and Treatment.

A total of 7% of all benign bone lesions are diagnosed as fibrous dysplasia (FD). The symptoms of FD of the jaw range from asymptomatic to dental anomalies, pain and facial asymmetry. Due to its resemblance to other fibro-osseous bone lesions, misdiagnosis often occurs and can lead to inadequate treatment. Particularly in the jaw, this lesion does not become quiescent during puberty, making fundamental knowledge about the diagnosis and treatment of FD crucial. Mutational analysis and nonsurgical approaches offer new diagnostic and therapeutic options. In this review, we examine the advances and the difficulties of the diagnosis and the various treatment modalities of FD of the jaw in order to capture the current scientific knowledge on this bone disease.

Lymph nodal recurrence in levels IV and V in oral squamous cell carcinoma after neck dissection.

BACKGROUND: The aim of the study was to determine the risk of lymph node recurrence in levels IV and V after tumour resection and neck dissection of level I-III and level I-V. METHODS: Data from 228 patients suffering from OSCC were analysed retrospectively. Patients with level I-III neck dissection were compared to those with level I-V neck dissection in terms of number and location of nodal recurrence. The incidence of level IV-V recurrence in patients who had received level I-III neck dissection was compared with that of patients who had received level I-V neck dissection. The incidence of level IV-V recurrence was also compared between patients with pN0 and pN+ necks. RESULTS: Overall, 19 patients developed metastases. Only in two cases appeared nodal recurrence in levels IV or V. There was no statistically significant difference between both groups. CONCLUSIONS: Neck dissection of levels I-III seems to be sufficient treatment in cases of unsuspicious lymph nodes in levels IV and V, even in cases of positive nodes in levels I-III if adjuvant radiation therapy is applied. However, 5-year-disease free survival rate is lower in patients with nodal metastases in levels IV and V than in patients with metastases located in levels I-III.

Influence of dental status on outcome after lung transplantation.

INTRODUCTION: Poor oral hygiene can cause infections and inflammatory diseases. Data on its impact on outcome after lung transplantation (LuTX) is scarce. Most transplant centers have individual standards regarding dental care as there is no clinical guideline. This study's objective was to assess LuTX-listed patient's dental status and determine its effect on postoperative outcome. METHODS: Two hundred patients having undergone LuTX from 2014 to 2019 were selected. Collected data comprised LuTX-indication, periodontal status, and number of carious teeth/fillings. A preoperative panoramic dental X-ray and a dentist's consultative clarification were mandatory. RESULTS: 63.5% had carious dental status, differing significantly regarding TX-indication (p < 0.001; ILD: 41.7% vs. CF: 3.1% of all patients with carious teeth). Mean age at the time of LuTX differed significantly within these groups. Neither preoperative carious dental status nor periodontitis or bone loss deteriorated post-LuTX survival significantly. No evidence was found that either resulted in a greater number of deaths related to an infectious etiology. CONCLUSION: This study shows that carious dental status, periodontitis, and bone loss do not affect post-TX survival. However, literature indicates that they can cause systemic/pulmonary infections that deteriorate post-LuTX survival. Regarding the absence of standardized guidelines regarding dental care and LuTX, we strongly recommend emphasizing research in this field.

Monopolar electrocautery versus sharp dissection in the neck dissection: a retrospective study.

The cold scalpel/scissors (CS) and the monopolar electrocautery (ME) are still the most commonly used instruments for neck dissection in head and neck oncology. However, a direct comparison of these techniques does not exist. This study aims to compare these techniques concerning blood loss, the decline of hemoglobin levels, and surgery duration. Data on 200 patients who received tumor resection, neck dissection and either a radial forearm free flap (RFFF)or a primary closure (PC) were examined retrospectively. The patients were divided according to the performed defect closure (RFFF or PC) and the main instrument usedfor the beck dissection (Group 1: RFFF and ME, Group 2: RFFF and CS, Group 3: PC and ME Group 4: PC and CS). The intraoperative blood loss, decline of hemoglobin values and surgery duration were analyzed and compared between the corresponding groups. The patients where the ME was used lost on average 409.93 ml (group 1 vs. 2) and 242.4 ml (group 3 vs. 4) less blood. The median decrease in the hemoglobin levels was by 1.01 g/dL (group 1 vs. 2) and 0.85 g/dL (group 3 vs. 4) lower for the ME. The median surgery duration was by 102 min (group 1 vs. 2) and 83 min (group 3 vs. 4) shorterfor the ME. All differences were statistically significant. Traditional scalpel and scissors used for neck dissection lead to significantly higher blood loss and longer operation time than the monopolar electrocautery.

Recent Advances, Systemic Therapy, and Molecular Targets in Adenoid Cystic Carcinoma of the Head and Neck.

With an incidence of 3-4.5 cases per million, adenoid cystic carcinoma (ACC) of the head and neck is one of the most common tumors of the parotid and sublingual salivary glands. In the clinical course, ACC is shown to have an aggressive long-term behavior, which leads to the fact that radical surgical resection of the tumor with tumor-free margins remains the "gold standard" in treating ACC. Particle radiation therapy and systemic molecular biological approaches offer new treatment options. However, risk factors for the formation and prognosis of ACC have not yet been clearly identified. The aim of the present review was to investigate long-term experience of diagnosis and treatment as well as risk and prognostic factors for occurrence and outcome of ACC.

Postoperative Delirium in Patients with Oral Cancer: Is Intraoperative Fluid Administration a Neglected Risk Factor?

Squamous cell carcinoma (SCC) is a malignant tumor derived from squamous cells and can be found in different localizations. In the oral cavity especially, it represents the most common type of malignant tumor. First-line therapy for oral squamous cell carcinoma (OSCC) is surgery, including tumor resection, neck dissection, and maybe reconstruction. Although perioperative mortality is low, complications such as delirium are very common, and may have long-lasting consequences on the patient's quality of life. This study examines if excessive fluid administration, among other parameters, is an aggravating factor for the development of postoperative delirium. A total of 198 patients were divided into groups concerning the reconstruction technique used: group A for primary wound closure or reconstruction with a local flap, and group B for microsurgical reconstruction. The patients with and without delirium in both groups were compared regarding intraoperative fluid administration, fluid balance, and other parameters, such as blood loss, duration of surgery and overall ventilation, alcohol consumption, and creatinine, albumin, natrium, and hematocrit levels. The logistic regression for group A shows that fluid intake (p = 0.02, OR = 5.27, 95% CI 1.27-21.8) and albumin levels (p = 0.036, OR = 0.22, CI 0.054-0.908) are independent predictors for the development of delirium. For group B, gender (p = 0.026, OR = 0.34, CI 0.133-0.879) with a protective effect for females, fluid intake (p = 0.003, OR = 3.975, CI 1.606-9.839), and duration of ventilation (p = 0.025, OR = 1.178, CI 1.021-1.359) are also independent predictors for delirium. An intake of more than 3000 mL for group A, and 4150 mL for group B, increases the risk of delirium by approximately five and four times, respectively. Fluid management should be considered carefully in patients with OSCC, in order to reduce the occurrence of postoperative delirium. Different factors may become significant for the development of delirium regarding different surgical procedures.

Application of the lambda plate on condylar fractures: Finite element evaluation of the fixation rigidity for different fracture patterns and plate placements.

PURPOSE: The treatment challenges of condylar fractures necessitated the production of several plate designs. Among the relatively new plate designs is the lambda plate, for which biomechanical and clinical data are lacking. The purpose of this study is to examine the rigidity of fixation achieved when the lambda plate is applied to different fractures of the condylar neck and base. METHODS: Five fractures of the condylar area were designed on a virtual model of a healthy mandible obtained from a CT scan. The fractures were reduced using the lambda plate. For the same fractures, alternative placements of the plate were simulated. The generated models were analysed using the finite element analysis for a 500 N bite load. The displacement of the two condylar fragments along the fracture line was calculated as an indicator of the rigidity of the fixation. RESULTS: The displacement along the fracture was less than 0.144 mm for the neck fractures and greater than 0.165 mm for the fractures of the condylar base. A more cranial placement of the plate for the neck fractures further reduced the displacement, while a more anterior placement of the plate for the base fractures resulted in displacements greater than 0.330 mm. CONCLUSION: According to our study, the lambda plate offers better rigidity when applied as cranially as possible for condylar neck fractures. The lambda plate did not provide adequate fixation for base fractures. A second plate at the sigmoid notch should be considered to achieve better stabilization along the fracture if the lambda plate is eventually used.

Finite element analysis of different titanium miniplates: Evaluation of three-dimensional designs applied on condylar neck fractures.

INTRODUCTION: The fixation of condylar neck fractures is raising difficulties and for this reason, many plate designs have been developed. The current study compares the performance of four miniplates used in the condylar neck. MATERIAL AND METHODS: A virtual condylar neck fracture in a mandible obtained from a CT scan was fixed with four miniplates (two straight miniplates, lambda, strut, and trapezoidal). Using finite element analysis, we examined the fragments' displacements and stress distribution in the titanium material and bone. The models were analyzed under two loading conditions: a reduced bite force of 135 N and a force of 500 N. RESULTS: No risk of material failure was observed. For a load of 135 N, all four plates offer an adequate fixation. For 500 N of applied loading, the lambda and strut plates showed the best rigidity and lowest bone strains. The two parallel plates showed the lowest rigidity and the trapezoidal plate the highest bone strains around all screws. DISCUSSION: These findings imply that three-dimensional miniplates (lambda, strut) perform better when higher loads are applied. On the other hand, the trapezoidal plate has an increased risk of screw loosening and the two straight plates higher mobility of the fragments.

Prediction of surface area size in orbital floor and medial orbital wall fractures based on topographical subregions.

OBJECTIVE: This retrospective study evaluates the occurrence and frequency of different fracture patterns in a series of computed tomography (CT) scans in terms of the AOCMF Trauma Classification (TC) orbit module and correlates the assigned defects with measurements of the fracture area in order to get an approximate guideline for fracture size predictions on the basis of the classification. MATERIAL AND METHODS: CT scans of patients with orbital floor fractures were evaluated using the AOCMFTC to determine the topographical subregions. The coding consisted of: W = orbital wall, 1 = anterior orbit, 2 = midorbit, i = inferior, m = medial. The 3-dimensional surface area size of the fractures was quantified by the "defect body" method (Brainlab, Munich, Germany). The fracture area size and its confidence and prediction interval within each topographical subregion was estimated by regression analysis. RESULTS: A total of 137 CT scans exhibited 145 orbital floor fractures, which were combined with 34 medial orbital wall fractures in 31 patients. The floor fractures - W1(i)2(i) (n = 86) and W1(i) (n = 19) were the most frequent patterns. Combined floor and medial wall fractures most frequently corresponded to the pattern W1 (im)2 (im) (n = 15) ahead of W1 (im) 2(i) (n = 10). The surface area size ranged from 0.11 cm2 to 6.09 cm2 for orbital floor and from 0.29 cm2 to 5.43 cm2 for medial wall fractures. The prediction values of the mean fracture area size within the subregions were computed as follows: W1(i) = 2.25 cm2, W2(i) = 1.64 cm2, W1(i)2(i) = 3.10 cm2, W1(m) = 1.36 cm2, W2(m) = 1.65 cm2, W1(m)2(m) = 2.98 cm2, W1 (im) = 3.35 cm2, W1 (im) 2(i) = 4.63 cm2, W1 (im)2(m) = 4.06 cm2 and W1 (im)2 (im) = 7.16 cm2. CONCLUSION: The AOCMFTC orbital module offers a suitable framework for topographical allocation of fracture patterns inside the infero-medial orbital cavity. The involvement of the subregions is of predictive value providing estimations of the mean 3-D fracture area size.

Finite Element Analysis of Different Titanium Plates for Internal Fixation of Fractures of the Mandibular Condylar Neck.

PURPOSE: The purpose of the present study is to compare the performance of 4 titanium miniplates (alpha, kappa, rhomboidal, and trapezoidal) used for the fixation of condylar neck fractures by implementing computational finite element analysis. METHODS: Three-dimensional models of the plates were used to reduce a virtually created condylar neck fracture in a mandible obtained from a computed tomography scan of a healthy adult. The developed models were analyzed, making use of the finite element method under 2 loading scenarios: a reduced postoperative bite force of 135 N and a clenching force of 500 N were examined. The plating designs' performance was assessed based on displacements along the fracture area, bone strains, and plate stresses. RESULTS: For a loading limited to 135 N, all 4 plates offer an adequate fixation with a small risk of screw loosening for the rhomboidal and trapezoidal plates. For an applied force of 500 N, the alpha and kappa plates showed better results, distributing more homogeneously the strains in the bone and offering better rigidity. CONCLUSIONS: These findings implicate that the alpha and kappa plates performed better when bigger loads are applied. On the other hand, the trapezoidal and rhomboidal plates are not recommended for condylar fractures, especially if bigger functional loads are expected.

Combination of Rigid and Nonrigid Fixation Versus Nonrigid Fixation for Bilateral Mandibular Fractures: A Multicenter Randomized Controlled Trial.

PURPOSE: We aimed to compare complication rates and functional outcomes in patients with bilateral mandibular fractures treated with different degrees of internal fixation rigidity. PATIENTS AND METHODS: This international, multicenter randomized controlled trial included adults with bilateral mandibular fractures located at either the angle and body, angle and symphysis, or body and symphysis. Patients were treated with either a combination of rigid fixation for the anterior fracture and nonrigid fixation for the posterior fracture (mixed fixation) or nonrigid fixation for both fractures. The primary outcome was complications within 6 weeks after surgery. Secondary outcomes were complications within 3 months, Helkimo dysfunction index, and mandibular mobility at 6 weeks and 3 months after surgery. RESULTS: Of the 315 patients enrolled, 158 were randomized to the mixed fixation group and 157 to the nonrigid fixation group. The overall complication rate at 6 weeks in the intention-to-treat population was 9.6% (95% confidence interval [CI], 5.3% to 15.6%) in the mixed fixation group and 7.8% (95% CI, 4.0% to 13.5%) in the nonrigid fixation group. With an unadjusted odds ratio of 1.25 (95% CI, 0.51 to 3.17), there were no statistically significant differences in complication rates between the 2 groups (P = .591). A multivariable model for complication risk at 6 weeks found no significant differences between treatment groups, but patients with moderate or severe displacement had a higher complication rate than those with no or minimal displacement (adjusted odds ratio, 4.58; 95% CI, 1.16 to 18.06; P = .030). There were no significant between-group differences in complication rates at 3 months. Moreover, no significant differences in Helkimo dysfunction index and mandibular mobility index at 6 weeks and 3 months were found between groups according to treatment allocated and treatment received. CONCLUSIONS: A combination of rigid and nonrigid fixation in patients with bilateral mandibular fracture has similar complication rates and functional outcomes to nonrigid fixation for both fractures.

Evaluation of Complications After Open Reduction and Internal Fixation of Mandibular Condylar Base and Neck Fractures Using Trapezoidal Plates.

The purpose of the study was to evaluate the different fracture pattern of patients being treated with trapezoidal plate fixation of condylar base and neck fractures using the AOCMF Classification System to determine specific fracture pattern that are associated with failure of trapezoidal plate fixation. Ten patients with mandibular condylar base and neck fractures underwent internal fixation using trapezoidal plates. Fractures of the condylar process were classified according to the AOCMF Classification System using computed tomography data. The fracture pattern was compared to complications according to hardware failure such as plate or screw loosening and plate fracture. Plate and screw loosening of trapezoidal plates for fixation of condylar base and neck fractures was associated with fracture location in the neck region and major fragment displacement with contact loss between the proximal and distal fragment of the fracture. Further investigations such as finite-element analysis of different plating systems for fixation of condylar neck fractures are necessary to establish the optimal fixation technique for condylar neck fractures.

Open Reduction and Internal Fixation of Unilateral Mandibular Condylar Base and Neck Fractures Using a Lambda Plate: Selection Criteria for Application.

PURPOSE: The aim of this study was to evaluate the clinical, radiologic, and functional outcomes in a retrospective cohort study of patients with condylar base and neck fractures treated with open reduction and internal fixation via lambda plates to define selection criteria for their application. PATIENTS AND METHODS: Eleven patients underwent open reduction and internal fixation using lambda plates for osteosynthesis of condylar base and neck fractures. The mean follow-up period was 8 months. All kinds of complications were recorded. Postoperative maximum jaw opening and occlusion were determined. Pain on palpation of the joint area, pain on movement, and muscle pain were examined. The criteria for the intraoperative selection of a lambda plate were recorded. RESULTS: Positioning and fixation of lambda plates were feasible in all cases. A condylar neck fracture with limited bone surface on the proximal fragment for internal fixation prevailed as the primary indication for the selection of a lambda plate. Avoiding extensive soft tissue stripping at the proximal fragment when using a transoral endoscopically assisted approach in cases of condylar base fractures also was a selection criterion. The overall complication rate was low. CONCLUSIONS: The indications for lambda plates for internal fixation of condylar fractures are neck fractures with limited bone surface along the proximal fragment for internal fixation. Application of the plate through a transoral endoscopic approach to avoid extensive soft tissue stripping at the proximal fragment is favorable in high condylar base fractures.