The Experts below are selected from a list of 63 Experts worldwide ranked by ideXlab platform
Shogo Kikuta - One of the best experts on this subject based on the ideXlab platform.
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A new variant ligament of the Atlantooccipital Joint: the lateral oblique Atlantooccipital ligament
European Spine Journal, 2019Co-Authors: Shogo Kikuta, Joe Iwanaga, Rod J Oskouian, R. Shane TubbsAbstract:Purpose During routine dissection of the anterior craniocervical junction (CCJ), a variant ligament just anterior to the articular capsule of the Atlantooccipital Joint was observed. To our knowledge, no literature has previously described this ligament. Therefore, the aim of this study was to clarify the anatomy, incidence, and biomechanics of this undescribed structure of the anterior Atlantooccipital Joint. Methods Twenty-six sides from 13 fresh-frozen adult cadavers were used for this study and the morphology of the variant ligament examined. When present, its length, width, thickness, and the angle from the midline of the CCJ were measured. Results The variant ligament identified, when present, is distinct and located anterior to the Atlantooccipital Joint capsule traveling between the occipital bone and the transverse process of the atlas. The ligament was found on 12 of 26 sides (46.2%). The mean length of the ligament was 32.0 ± 5.5 mm. The ligament became taut with contralateral lateral flexion and the ipsilateral rotation of the Atlantooccipital Joint. Conclusions We propose that this ligament may be termed the lateral oblique Atlantooccipital ligament. To date, this structure has not been described in any textbooks or reports in the extant medical literature. Although its function is not clear, based on its course and connections, it might function as a secondary stabilizer of the Atlantooccipital Joint. As the stability of the craniocervical junction is of paramount importance, knowledge of normal and variant anatomical structures in this region is important for the surgeon treating patients with pathology of this region. Graphical abstract These slides can be retrieved under Electronic Supplementary Material.
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a new variant ligament of the Atlantooccipital Joint the lateral oblique Atlantooccipital ligament
European Spine Journal, 2019Co-Authors: Shogo Kikuta, Joe Iwanaga, Rod J Oskouian, Shane R TubbsAbstract:Purpose During routine dissection of the anterior craniocervical junction (CCJ), a variant ligament just anterior to the articular capsule of the Atlantooccipital Joint was observed. To our knowledge, no literature has previously described this ligament. Therefore, the aim of this study was to clarify the anatomy, incidence, and biomechanics of this undescribed structure of the anterior Atlantooccipital Joint.
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a new variant ligament of the Atlantooccipital Joint the lateral oblique Atlantooccipital ligament
European Spine Journal, 2019Co-Authors: Shogo Kikuta, Joe Iwanaga, Rod J Oskouian, Shane R TubbsAbstract:During routine dissection of the anterior craniocervical junction (CCJ), a variant ligament just anterior to the articular capsule of the Atlantooccipital Joint was observed. To our knowledge, no literature has previously described this ligament. Therefore, the aim of this study was to clarify the anatomy, incidence, and biomechanics of this undescribed structure of the anterior Atlantooccipital Joint. Twenty-six sides from 13 fresh-frozen adult cadavers were used for this study and the morphology of the variant ligament examined. When present, its length, width, thickness, and the angle from the midline of the CCJ were measured. The variant ligament identified, when present, is distinct and located anterior to the Atlantooccipital Joint capsule traveling between the occipital bone and the transverse process of the atlas. The ligament was found on 12 of 26 sides (46.2%). The mean length of the ligament was 32.0 ± 5.5 mm. The ligament became taut with contralateral lateral flexion and the ipsilateral rotation of the Atlantooccipital Joint. We propose that this ligament may be termed the lateral oblique Atlantooccipital ligament. To date, this structure has not been described in any textbooks or reports in the extant medical literature. Although its function is not clear, based on its course and connections, it might function as a secondary stabilizer of the Atlantooccipital Joint. As the stability of the craniocervical junction is of paramount importance, knowledge of normal and variant anatomical structures in this region is important for the surgeon treating patients with pathology of this region. These slides can be retrieved under Electronic Supplementary Material.
Shane R Tubbs - One of the best experts on this subject based on the ideXlab platform.
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a new variant ligament of the Atlantooccipital Joint the lateral oblique Atlantooccipital ligament
European Spine Journal, 2019Co-Authors: Shogo Kikuta, Joe Iwanaga, Rod J Oskouian, Shane R TubbsAbstract:Purpose During routine dissection of the anterior craniocervical junction (CCJ), a variant ligament just anterior to the articular capsule of the Atlantooccipital Joint was observed. To our knowledge, no literature has previously described this ligament. Therefore, the aim of this study was to clarify the anatomy, incidence, and biomechanics of this undescribed structure of the anterior Atlantooccipital Joint.
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a new variant ligament of the Atlantooccipital Joint the lateral oblique Atlantooccipital ligament
European Spine Journal, 2019Co-Authors: Shogo Kikuta, Joe Iwanaga, Rod J Oskouian, Shane R TubbsAbstract:During routine dissection of the anterior craniocervical junction (CCJ), a variant ligament just anterior to the articular capsule of the Atlantooccipital Joint was observed. To our knowledge, no literature has previously described this ligament. Therefore, the aim of this study was to clarify the anatomy, incidence, and biomechanics of this undescribed structure of the anterior Atlantooccipital Joint. Twenty-six sides from 13 fresh-frozen adult cadavers were used for this study and the morphology of the variant ligament examined. When present, its length, width, thickness, and the angle from the midline of the CCJ were measured. The variant ligament identified, when present, is distinct and located anterior to the Atlantooccipital Joint capsule traveling between the occipital bone and the transverse process of the atlas. The ligament was found on 12 of 26 sides (46.2%). The mean length of the ligament was 32.0 ± 5.5 mm. The ligament became taut with contralateral lateral flexion and the ipsilateral rotation of the Atlantooccipital Joint. We propose that this ligament may be termed the lateral oblique Atlantooccipital ligament. To date, this structure has not been described in any textbooks or reports in the extant medical literature. Although its function is not clear, based on its course and connections, it might function as a secondary stabilizer of the Atlantooccipital Joint. As the stability of the craniocervical junction is of paramount importance, knowledge of normal and variant anatomical structures in this region is important for the surgeon treating patients with pathology of this region. These slides can be retrieved under Electronic Supplementary Material.
Jacques J Morcos - One of the best experts on this subject based on the ideXlab platform.
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isolated unilateral hypoglossal nerve palsy secondary to an Atlantooccipital Joint juxtafacet synovial cyst
Journal of Neurosurgery, 2009Co-Authors: Mohamed Samy Elhammady, Hamad Farhat, Mohammad Ali Azizsultan, Jacques J MorcosAbstract:Juxtafacet cysts of the Atlantooccipital Joint that present with isolated hypoglossal nerve palsy are rare and may mimic more common pathological entities. The authors report on the third such case in the literature and discuss the differential diagnosis, imaging hallmarks, preoperative recognition, and surgical management of this lesion, and provide a review of the literature. The authors discuss their experience with the treatment of a 67-year-old woman who presented with an isolated hypoglossal nerve palsy caused by a nonenhancing cystic septated lesion abutting the lateral medulla just medial to the left hypoglossal canal. The lesion was presumed to be a necrotic hypoglossal schwannoma or epidermoid tumor. Intradural surgical exploration failed to demonstrate an intradural lesion, but confirmed the presence of an extradural mass caudal to the hypoglossal nerve. Extradural exploration revealed a synovial cyst of the Atlantooccipital Joint, which was then resected. Postoperatively, the patient developed worsening dysphagia and hoarseness. Failure to recognize this rare entity preoperatively resulted in unnecessary intradural exploration and cranial nerve morbidity. In retrospect, the preoperative diagnosis of this lesion was suggested by lack of central enhancement, absence of dumbbell formation and the presence of erosive synovial changes. Regardless, the extreme rarity of this lesion at this location will always make its recognition challenging.
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isolated unilateral hypoglossal nerve palsy secondary to an Atlantooccipital Joint juxtafacet synovial cyst case report and review of the literature
Journal of Neurosurgery, 2009Co-Authors: Mohamed Samy Elhammady, Hamad Farhat, Mohammad Ali Azizsultan, Jacques J MorcosAbstract:Juxtafacet cysts of the Atlantooccipital Joint that present with isolated hypoglossal nerve palsy are rare and may mimic more common pathological entities. The authors report on the third such case in the literature and discuss the differential diagnosis, imaging hallmarks, preoperative recognition, and surgical management of this lesion, and provide a review of the literature. The authors discuss their experience with the treatment of a 67-year-old woman who presented with an isolated hypoglossal nerve palsy caused by a nonenhancing cystic septated lesion abutting the lateral medulla just medial to the left hypoglossal canal. The lesion was presumed to be a necrotic hypoglossal schwannoma or epidermoid tumor. Intradural surgical exploration failed to demonstrate an intradural lesion, but confirmed the presence of an extradural mass caudal to the hypoglossal nerve. Extradural exploration revealed a synovial cyst of the Atlantooccipital Joint, which was then resected. Postoperatively, the patient developed...
Rod J Oskouian - One of the best experts on this subject based on the ideXlab platform.
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A new variant ligament of the Atlantooccipital Joint: the lateral oblique Atlantooccipital ligament
European Spine Journal, 2019Co-Authors: Shogo Kikuta, Joe Iwanaga, Rod J Oskouian, R. Shane TubbsAbstract:Purpose During routine dissection of the anterior craniocervical junction (CCJ), a variant ligament just anterior to the articular capsule of the Atlantooccipital Joint was observed. To our knowledge, no literature has previously described this ligament. Therefore, the aim of this study was to clarify the anatomy, incidence, and biomechanics of this undescribed structure of the anterior Atlantooccipital Joint. Methods Twenty-six sides from 13 fresh-frozen adult cadavers were used for this study and the morphology of the variant ligament examined. When present, its length, width, thickness, and the angle from the midline of the CCJ were measured. Results The variant ligament identified, when present, is distinct and located anterior to the Atlantooccipital Joint capsule traveling between the occipital bone and the transverse process of the atlas. The ligament was found on 12 of 26 sides (46.2%). The mean length of the ligament was 32.0 ± 5.5 mm. The ligament became taut with contralateral lateral flexion and the ipsilateral rotation of the Atlantooccipital Joint. Conclusions We propose that this ligament may be termed the lateral oblique Atlantooccipital ligament. To date, this structure has not been described in any textbooks or reports in the extant medical literature. Although its function is not clear, based on its course and connections, it might function as a secondary stabilizer of the Atlantooccipital Joint. As the stability of the craniocervical junction is of paramount importance, knowledge of normal and variant anatomical structures in this region is important for the surgeon treating patients with pathology of this region. Graphical abstract These slides can be retrieved under Electronic Supplementary Material.
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a new variant ligament of the Atlantooccipital Joint the lateral oblique Atlantooccipital ligament
European Spine Journal, 2019Co-Authors: Shogo Kikuta, Joe Iwanaga, Rod J Oskouian, Shane R TubbsAbstract:Purpose During routine dissection of the anterior craniocervical junction (CCJ), a variant ligament just anterior to the articular capsule of the Atlantooccipital Joint was observed. To our knowledge, no literature has previously described this ligament. Therefore, the aim of this study was to clarify the anatomy, incidence, and biomechanics of this undescribed structure of the anterior Atlantooccipital Joint.
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a new variant ligament of the Atlantooccipital Joint the lateral oblique Atlantooccipital ligament
European Spine Journal, 2019Co-Authors: Shogo Kikuta, Joe Iwanaga, Rod J Oskouian, Shane R TubbsAbstract:During routine dissection of the anterior craniocervical junction (CCJ), a variant ligament just anterior to the articular capsule of the Atlantooccipital Joint was observed. To our knowledge, no literature has previously described this ligament. Therefore, the aim of this study was to clarify the anatomy, incidence, and biomechanics of this undescribed structure of the anterior Atlantooccipital Joint. Twenty-six sides from 13 fresh-frozen adult cadavers were used for this study and the morphology of the variant ligament examined. When present, its length, width, thickness, and the angle from the midline of the CCJ were measured. The variant ligament identified, when present, is distinct and located anterior to the Atlantooccipital Joint capsule traveling between the occipital bone and the transverse process of the atlas. The ligament was found on 12 of 26 sides (46.2%). The mean length of the ligament was 32.0 ± 5.5 mm. The ligament became taut with contralateral lateral flexion and the ipsilateral rotation of the Atlantooccipital Joint. We propose that this ligament may be termed the lateral oblique Atlantooccipital ligament. To date, this structure has not been described in any textbooks or reports in the extant medical literature. Although its function is not clear, based on its course and connections, it might function as a secondary stabilizer of the Atlantooccipital Joint. As the stability of the craniocervical junction is of paramount importance, knowledge of normal and variant anatomical structures in this region is important for the surgeon treating patients with pathology of this region. These slides can be retrieved under Electronic Supplementary Material.
Joe Iwanaga - One of the best experts on this subject based on the ideXlab platform.
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A new variant ligament of the Atlantooccipital Joint: the lateral oblique Atlantooccipital ligament
European Spine Journal, 2019Co-Authors: Shogo Kikuta, Joe Iwanaga, Rod J Oskouian, R. Shane TubbsAbstract:Purpose During routine dissection of the anterior craniocervical junction (CCJ), a variant ligament just anterior to the articular capsule of the Atlantooccipital Joint was observed. To our knowledge, no literature has previously described this ligament. Therefore, the aim of this study was to clarify the anatomy, incidence, and biomechanics of this undescribed structure of the anterior Atlantooccipital Joint. Methods Twenty-six sides from 13 fresh-frozen adult cadavers were used for this study and the morphology of the variant ligament examined. When present, its length, width, thickness, and the angle from the midline of the CCJ were measured. Results The variant ligament identified, when present, is distinct and located anterior to the Atlantooccipital Joint capsule traveling between the occipital bone and the transverse process of the atlas. The ligament was found on 12 of 26 sides (46.2%). The mean length of the ligament was 32.0 ± 5.5 mm. The ligament became taut with contralateral lateral flexion and the ipsilateral rotation of the Atlantooccipital Joint. Conclusions We propose that this ligament may be termed the lateral oblique Atlantooccipital ligament. To date, this structure has not been described in any textbooks or reports in the extant medical literature. Although its function is not clear, based on its course and connections, it might function as a secondary stabilizer of the Atlantooccipital Joint. As the stability of the craniocervical junction is of paramount importance, knowledge of normal and variant anatomical structures in this region is important for the surgeon treating patients with pathology of this region. Graphical abstract These slides can be retrieved under Electronic Supplementary Material.
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a new variant ligament of the Atlantooccipital Joint the lateral oblique Atlantooccipital ligament
European Spine Journal, 2019Co-Authors: Shogo Kikuta, Joe Iwanaga, Rod J Oskouian, Shane R TubbsAbstract:Purpose During routine dissection of the anterior craniocervical junction (CCJ), a variant ligament just anterior to the articular capsule of the Atlantooccipital Joint was observed. To our knowledge, no literature has previously described this ligament. Therefore, the aim of this study was to clarify the anatomy, incidence, and biomechanics of this undescribed structure of the anterior Atlantooccipital Joint.
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a new variant ligament of the Atlantooccipital Joint the lateral oblique Atlantooccipital ligament
European Spine Journal, 2019Co-Authors: Shogo Kikuta, Joe Iwanaga, Rod J Oskouian, Shane R TubbsAbstract:During routine dissection of the anterior craniocervical junction (CCJ), a variant ligament just anterior to the articular capsule of the Atlantooccipital Joint was observed. To our knowledge, no literature has previously described this ligament. Therefore, the aim of this study was to clarify the anatomy, incidence, and biomechanics of this undescribed structure of the anterior Atlantooccipital Joint. Twenty-six sides from 13 fresh-frozen adult cadavers were used for this study and the morphology of the variant ligament examined. When present, its length, width, thickness, and the angle from the midline of the CCJ were measured. The variant ligament identified, when present, is distinct and located anterior to the Atlantooccipital Joint capsule traveling between the occipital bone and the transverse process of the atlas. The ligament was found on 12 of 26 sides (46.2%). The mean length of the ligament was 32.0 ± 5.5 mm. The ligament became taut with contralateral lateral flexion and the ipsilateral rotation of the Atlantooccipital Joint. We propose that this ligament may be termed the lateral oblique Atlantooccipital ligament. To date, this structure has not been described in any textbooks or reports in the extant medical literature. Although its function is not clear, based on its course and connections, it might function as a secondary stabilizer of the Atlantooccipital Joint. As the stability of the craniocervical junction is of paramount importance, knowledge of normal and variant anatomical structures in this region is important for the surgeon treating patients with pathology of this region. These slides can be retrieved under Electronic Supplementary Material.