|A Morphometric Study of the Maxillary Artery and Lingula in Relation to Mandibular Ramus Osteotomies and TMJ Surgery.|
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|PMID: 20396448 Owner: NLM Status: PubMed-not-MEDLINE|
|OBJECTIVES: Mandibular osteotomies and resection of the temporomandibular joint (TMJ) ankylosis are the mostly performed surgical procedures in the infratemporal fossa, which is in close proximity with the main trunk of the maxillary artery (MA). It is imperative to avoid the trunk or branches of the maxillary artery, otherwise, massive intraoperative or postoperative hemorrhage may develop. The goal of the study was to investigate the position of the maxillary artery in the infratemporal fossa and the lingula of the mandible.
METHODS: Significant landmarks were selected on the mandibles of formalin fixed cadavers, and the distances were measured between the maxillary artery and the bony landmarks with a digital caliper.
RESULTS: The average distances between the MA and the articular eminence, the medial cortex of the mandibular ramus, the inferior border of the pterygoid fovea and the mandibular notch were 1.67+/-0.48 mm, 5.38+/-2.47 mm, 16.84+/-1.74 mm, 2.94+/-0.52 mm, respectively. Course pattern of the MA at the subcondylar level was also mapped. In order to determine the position of the lingula, the average distances between the tip of the lingula and the mandibular notch, the inferior border of the ramus, the anterior margin of the ramus and posterior margin of the ramus were measured and found as 15.4+/-2.1 mm, 49.5+/-4.3 mm, 18.1+/-2.7 mm, 16.6+/-2.5 mm, respectively. No significant differences were found between the right and left sides, for all parameters.
CONCLUSIONS: The studied parameters will assist and navigate clinicians to determine the anatomic proximity to the maxillary artery, and, minimize the risk of damaging the vessel.
|Huseyin Avni Balcioglu; Cenk Kilic; Altan Varol; Hasan Ozan; Necdet Kocabiyik; Mehmet Yildirim|
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|Type: Journal Article|
|Title: European journal of dentistry Volume: 4 ISSN: 1305-7464 ISO Abbreviation: Eur J Dent Publication Date: 2010 Apr|
|Created Date: 2010-04-16 Completed Date: 2011-07-14 Revised Date: 2013-05-29|
Medline Journal Info:
|Nlm Unique ID: 101303672 Medline TA: Eur J Dent Country: Turkey|
|Languages: eng Pagination: 166-70 Citation Subset: -|
|Department of Anatomy, Faculty of Dentistry, Istanbul University, Istanbul, Turkey.|
|APA/MLA Format Download EndNote Download BibTex|
Journal ID (nlm-ta): Eur J Dent
Journal ID (publisher-id): Eur J Dent
Publisher: Dental Investigations Society
Copyright 2010 European Journal of Dentistry. All rights reserved.
Print publication date: Month: 4 Year: 2010
Volume: 4 Issue: 2
First Page: 166 Last Page: 170
PubMed Id: 20396448
Publisher Id: dent04_p0166
|A Morphometric Study of the Maxillary Artery and Lingula in Relation to Mandibular Ramus Osteotomies and TMJ Surgery|
|Huseyin Avni Balcioglua|
a Department of Anatomy, Faculty of Dentistry, Istanbul University, Istanbul, Turkey.
b Department of Anatomy, Gulhane Military Medical Academy, Ankara, Turkey.
c Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Marmara University, Istanbul, Turkey.
d Department of Anatomy, Cerrahpasa Faculty of Medicine, Istanbul University, Istanbul, Turkey.
|Correspondence: Corresponding author: Dr. H. A. Balcioglu, Department of Anatomy, Faculty of Dentistry, Istanbul University, Capa, 34390, Istanbul, Turkey. Phone: +90 212 414 20 20, Fax: +90 212 531 22 30, E-mail:
Several procedures in maxillofacial surgery are performed in close proximity to the maxillary artery (MA) in the infratemporal fossa.1 Considering the fact that MA and its branches are vulnerable to iatrogenic injury during surgical approaches, precautions have to be taken in order to improve intraoperative safety and minimize or prevent massive life-threatening hemorrhage occurring after injury to the MA.2 The complicated nature of anatomy makes the first two parts of the MA relatively inaccessible and direct ligation impractical. Surgical exposure of the artery without damaging the facial nerve and condylar process is difficult.3
Sagittal split ramus osteotomy (SSRO) or intraoral vertical ramus osteotomy (IVRO), release of TMJ ankylosis, mandibular anesthetic block techniques, and drilling sequence during internal rigid fixation for subcondylar fractures have the potential to damage the MA.4?7 The MA emerges from the external carotid artery at the subcondylar level and passes in anteromedial fashion deep to the condylar neck of the mandible into the infratemporal fossa.8 Although the proximity of the artery to the medial cortex of the condylar process varies in the reported studies, it is known to pass immediately over the periosteum of the subcondylar area. The course of the MA differs according to race. It was found to pass laterally and superficially to the lateral pterygoid muscle in 9% to 55% of whites, in 69% of blacks, and in about 90% of Japanese.9
The maxillary artery is the major vessel with high arterial flow responsible for massive hemorrhage and formation of false aneurism in maxillofacial surgery, including both mandibular and maxillary surgeries.1,2,10 The branching pattern in the infratemporal/ pterygopalatine fossa, approaches for ligation, etc., were studied in detail; however, a small amount of data exist concerning its spatial relation to mandibular ramus osteotomies and temporomandibular joint surgeries.3,8,9 Therefore, we aimed to designate multiple bony landmarks belonging to the mandibular ramus and the glenoid fossa of the temporal bone and describe their morphometric properties to the maxillary artery.
When performing the SSRO, the exact location of the lingula is crucial, since the osteotomy is performed at the region around the lingula of the mandible during the medial horizontal osteotomy.11 We also morphometrically determined the position of the lingula.
The maxillary arteries were dissected bilaterally using a lateral infratemporal approach in 17 formalin-fixed adult cadavers (14 males and 3 females, total 34 sides) under a dissection microscope (Stemi 2000, Carl Zeiss, Jena, Germany). The mean age of the cadavers was 54 (range 23?76 years). The covering soft tissues, superficial lobe of the parotid gland, and masseter muscle were removed to unearth the mandibular condyle. The lateral surface of the ramus of the mandible was exposed along with the external carotid artery and the origin of the maxillary artery. Following the removal of the zygomatic arches using an oscillating saw, a mandibular osteotomy was performed, while making sure that the TMJ and the attachment of the lateral pterygoid muscle to the pterygoid fovea were preserved.
The most inferior point of the articular eminence, the medial cortex of the mandibular ramus, the inferior border of pterygoid fovea, and the mandibular notch were the bony landmarks selected to be studied with the maxillary artery. The topographical relationships between the MAs and these landmarks were evaluated. The distances between the defined landmarks and the maxillary arteries were measured using a digital caliper.
In order to determine the exact localization, the condylar level of the MAs was investigated. An imaginary line passing transversely from the inferior border of the pterygoid fovea at the middle of the neck of the mandible was decided as midcervical level. The regions above and below the line were defined as supracervical and infracervical, respectively (Figure 1).
The location of the mandibular lingula was determined by measuring the distance between the tip of the lingula and the sigmoid notch, the inferior border of the ramus, the anterior margin of the ramus, and the posterior margin of the ramus.
All data were analyzed by using one-way analysis of variance (ANOVA) test, with P<.05 accepted as significant. Data are presented as mean values ? SD.
The MAs coursed horizontally medial to the ramus of the mandible immediately after emerging from the external carotid artery and then ran superficial to the inferior head of the lateral pterygoid muscle in all specimens.
The average vertical distances between the MA and the most inferior point of the articular eminence, the medial cortex of the mandibular ramus, the inferior border of the pterygoid fovea, and the mandibular notch were determined as 1.67?0.48 mm, 5.38?2.47 mm, 16.84?1.74 mm, 2.94?0.52 mm, respectively. The course pattern of the MA at the subcondylar level was found to be as follows: 41% of the MAs passed supracervically (n=14), 29.5% passed midcervically (n=10), and the remaining 29.5% arteries passed infracervically (n=10). The distances measured between the tip of the lingula and the determined points are summarized in Table 1. No significant difference was computed between the mandibular rami and the glenoid fossa (P>.05).
In our study, we investigated the trajectory of the MA at the infratemporal fossa and the distances between the MA and the bony references on the glenoid fossa and the medial side of the mandibular ramus. To facilitate orientation during ramus osteotomies, the studied parameters were selected as the key bony landmarks of the ramus since these landmarks are used as intraoperative guiding points for bony osteotomies and are dissected to some extent intraoperatively.
The possible risk of injuring the MA is greater in resection of TMJ ankylosis among arthroplastic procedures; since the pattern of ossification and the fibrosis of pericapsular tissues differ greatly in every patient, it is more difficult to predict the course of MA due to anatomical variations and access restrictions.12,13 Few cadaver studies have focused on the possible risk of injuring the MA during mandibular ramus osteotomies.9,14 The position of the lingula is of critical importance for SSRO, whereas the relevant importance is attributed to the antilingula on the lateral aspect of the ramus for IVRO.15
In IVRO, extreme care is required to prevent damage to the maxillary artery when performing bicortical osteotomy from the mandibular notch inferiorly, since the maxillary artery passes upward across the lower head of the lateral pterygoid muscle inside the mandibular notch.5,9 Therefore, the medial aspect of the mandibular notch should be exposed carefully in the IVRO, and then a Levasseur-Merill or a Bauer retractor should be inserted to protect the MA from any damage.9
The reference line for performing the vertical bony cut passes behind the antilingula, which is found approximately with 54% predominance. The distance from the mandibular notch to the maxillary artery was reported to be 3.3?1.6 mm (n=8; range, 2 to 6 mm).15 These findings were consistent with ours: 2.94?0.52 mm. We found the ratio of the posterior margin of the ramus to the total ramus width (the sum of the distances between the lingula and the posterior margin of the ramus and anterior margin of the ramus) to be 0.52. Da Fontoura et al14 found a similar value for the ratio of the mandibular foramen-posterior ramus to the total ramus width: 0.32. The slight difference could be explained by the location of the tip of the lingula, which lies in front of the mandibular foramen.
Behrman16 reported severe intraoperative bleeding caused by damage to the MA during an SSRO. In a recent review of complications among a group of 655 patients undergoing orthognathic surgery, 78 cases had severe intraoperative bleeding at a volume over 1,000 mL.17 Among these, 1 case of an MA tear was the source of severe bleeding during the medial cut of the SSRO. Lanigan2 stressed the high probability of severe intraoperative bleeding from injury to the MA when the medial cut of the SSRO was placed in the vicinity of the mandibular notch.
In our cadaveric study, the average distances between the MA and the articular eminence, the articular process, the inferior border of the pterygoid fovea, and the mandibular notch were found to be 1.67?0.48 mm, 5.38?2.47 mm, 16.84?1.74 mm, and 2.94?0.52 mm, respectively. The MA is a potentially high-flow vessel capable of emptying a significant amount of blood within minutes. In the case of MA hemorrhage during TMJ ankylosis, an access restriction generally does not permit direct visualization of the bleeding vessel and requires ligation at the retromolar fossa together with the posterior auricular artery and the superficial temporal artery at the root of the zygoma.3,8,13
The measurements in our study revealed that the MA was in very close proximity to the condylar process. The fovea pterygoidea was found to be 16.84?1.74 mm away from the MA, which reveals the dangerous proximity of the MA to the upper level of the subcondylar region?the most resected section during ankylosis surgeries. For that reason, subperiosteal dissection of the medial side is of paramount importance to prevent extensive intraoperative or postoperative hemorrhage. The distance from the pterygoid fovea to the MA is approximately equal to the width of a periosteal elevator, which should be placed to keep clearance between the MA and condylar neck in order to prevent any arterial injury.
Knowledge of the arterial configuration and key bony structures improves the safety of current treatments and assists in the interpretation of hemorrhagic complications of the maxillary artery. The landmarks we suggest and the distances we measured will assist clinicians in increasing the success of their maxillofacial surgery procedures.
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Keywords: Maxillary artery, Lingula, Mandible, Vertical ramus osteotomy, Sagittal split osteotomy.
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