The Experts below are selected from a list of 5352 Experts worldwide ranked by ideXlab platform
K Gopinathan - One of the best experts on this subject based on the ideXlab platform.
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a rare anomaly of 5 ossicles in the pre interparietal part of the squamous Occipital Bone in north indians
Journal of Anatomy, 1992Co-Authors: K GopinathanAbstract:Abstract Examination of 125 adult north Indian skulls revealed a rare anomaly of 5 large ossicles in the upper central part of the squamous Occipital Bone. Their location and possible derivation are briefly discussed.
Tiruchelvarayan Rajendra - One of the best experts on this subject based on the ideXlab platform.
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A computed tomography morphometric study of Occipital Bone and C2 pedicle anatomy for Occipital-cervical fusion.
Surgical neurology international, 2014Co-Authors: Nicolas K K King, Tiruchelvarayan RajendraAbstract:Occipital-cervical fusion (OCF) has been used to treat instability of the occipito-cervical junction and to provide biomechanical stability after decompressive surgery. The specific areas that require detailed morphologic knowledge to prevent technical failures are the thickness of the Occipital Bone and diameter of the C2 pedicle, as the Occipital midline Bone and the C2 pedicle have structurally the strongest Bone to provide the biomechanical purchase for cranio-cervical instrumentation. The aim of this study was to perform a quantitative morphometric analysis using computed tomography (CT) to determine the variability of the Occipital Bone thickness and C2 pedicle thickness to optimize screw placement for OCF in a South East Asian population. Thirty patients undergoing cranio-cervical junction instrumentation during the period 2008-2010 were included. The thickness of the Occipital Bone and the length and diameter of the C2 pedicle were measured based on CT. The thickest point on the Occipital Bone was in the midline with a maximum thickness below the external Occipital protuberance of 16.2 mm (±3.0 mm), which was thicker than in the Western population. The average C2 pedicle diameter was 5.3 mm (±2.0 mm). This was smaller than Western population pedicle diameters. The average length of the both pedicles to the midpoint of the C2 vertebral body was 23.5 mm (±3.3 mm on the left and ±2.3 mm on the right). The results of this first study in the South East Asian population should help guide and improve the safety in occipito-cervical region instrumentation. Thus reducing the risk of technical failures and neuro-vascular injury.
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A computed tomography morphometric study of Occipital Bone and C2 pedicle anatomy for Occipital-cervical fusion
Surgical Neurology International, 2014Co-Authors: Nicolas K K King, Tiruchelvarayan RajendraAbstract:Background: Occipital-cervical fusion (OCF) has been used to treat instability of the occipito-cervical junction and to provide biomechanical stability after decompressive surgery. The specific areas that require detailed morphologic knowledge to prevent technical failures are the thickness of the Occipital Bone and diameter of the C2 pedicle, as the Occipital midline Bone and the C2 pedicle have structurally the strongest Bone to provide the biomechanical purchase for cranio-cervical instrumentation. The aim of this study was to perform a quantitative morphometric analysis using computed tomography (CT) to determine the variability of the Occipital Bone thickness and C2 pedicle thickness to optimize screw placement for OCF in a South East Asian population. Methods: Thirty patients undergoing cranio-cervical junction instrumentation during the period 2008-2010 were included. The thickness of the Occipital Bone and the length and diameter of the C2 pedicle were measured based on CT. Results: The thickest point on the Occipital Bone was in the midline with a maximum thickness below the external Occipital protuberance of 16.2 mm (±3.0 mm), which was thicker than in the Western population. The average C2 pedicle diameter was 5.3 mm (±2.0 mm). This was smaller than Western population pedicle diameters. The average length of the both pedicles to the midpoint of the C2 vertebral body was 23.5 mm (±3.3 mm on the left and ±2.3 mm on the right). Conclusions: The results of this first study in the South East Asian population should help guide and improve the safety in occipito-cervical region instrumentation. Thus reducing the risk of technical failures and neuro-vascular injury.
H C Srivastava - One of the best experts on this subject based on the ideXlab platform.
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Ossification of the membranous portion of the squamous part of the Occipital Bone in man.
Journal of anatomy, 1992Co-Authors: H C SrivastavaAbstract:The squamous part of the Occipital Bone consists of 2 parts, supraOccipital and interparietal. The supraOccipital develops both in cartilage and membrane. At the upper margin the Bone lying between the superior and highest nuchal lines known as the torus Occipitalis transversus is ossified in membrane by a pair of centres. This part of the supraOccipital represents the original membranous part of the primitive Occipital Bone of lower animals where the interparietals form part of the parietals. This segment of Bone is labelled as the intermediate segment which probably never separates from the cartilaginous supraOccipital. The interparietal Bone lying above the highest nuchal lines develops in membrane by 2 pairs of centres, 1 pair for the lateral plate and the other for the medial plate. Each centre consists of 2 nuclei. Failure of fusion between these centres or their nuclei with each other and the supraOccipital may give rise to various anomalies in the interparietal region which are discussed. This is the true interparietal Bone which has migrated from the parietals of lower animals during evolution to become part of the Occipital Bone in man. When it appears as an anomaly in the form of an independent separate Bone, the suture between it and the supraOccipital lies at the level of highest nuchal lines. There is no pre-interparietal Bone.(ABSTRACT TRUNCATED AT 250 WORDS)
Nicolas K K King - One of the best experts on this subject based on the ideXlab platform.
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A computed tomography morphometric study of Occipital Bone and C2 pedicle anatomy for Occipital-cervical fusion.
Surgical neurology international, 2014Co-Authors: Nicolas K K King, Tiruchelvarayan RajendraAbstract:Occipital-cervical fusion (OCF) has been used to treat instability of the occipito-cervical junction and to provide biomechanical stability after decompressive surgery. The specific areas that require detailed morphologic knowledge to prevent technical failures are the thickness of the Occipital Bone and diameter of the C2 pedicle, as the Occipital midline Bone and the C2 pedicle have structurally the strongest Bone to provide the biomechanical purchase for cranio-cervical instrumentation. The aim of this study was to perform a quantitative morphometric analysis using computed tomography (CT) to determine the variability of the Occipital Bone thickness and C2 pedicle thickness to optimize screw placement for OCF in a South East Asian population. Thirty patients undergoing cranio-cervical junction instrumentation during the period 2008-2010 were included. The thickness of the Occipital Bone and the length and diameter of the C2 pedicle were measured based on CT. The thickest point on the Occipital Bone was in the midline with a maximum thickness below the external Occipital protuberance of 16.2 mm (±3.0 mm), which was thicker than in the Western population. The average C2 pedicle diameter was 5.3 mm (±2.0 mm). This was smaller than Western population pedicle diameters. The average length of the both pedicles to the midpoint of the C2 vertebral body was 23.5 mm (±3.3 mm on the left and ±2.3 mm on the right). The results of this first study in the South East Asian population should help guide and improve the safety in occipito-cervical region instrumentation. Thus reducing the risk of technical failures and neuro-vascular injury.
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A computed tomography morphometric study of Occipital Bone and C2 pedicle anatomy for Occipital-cervical fusion
Surgical Neurology International, 2014Co-Authors: Nicolas K K King, Tiruchelvarayan RajendraAbstract:Background: Occipital-cervical fusion (OCF) has been used to treat instability of the occipito-cervical junction and to provide biomechanical stability after decompressive surgery. The specific areas that require detailed morphologic knowledge to prevent technical failures are the thickness of the Occipital Bone and diameter of the C2 pedicle, as the Occipital midline Bone and the C2 pedicle have structurally the strongest Bone to provide the biomechanical purchase for cranio-cervical instrumentation. The aim of this study was to perform a quantitative morphometric analysis using computed tomography (CT) to determine the variability of the Occipital Bone thickness and C2 pedicle thickness to optimize screw placement for OCF in a South East Asian population. Methods: Thirty patients undergoing cranio-cervical junction instrumentation during the period 2008-2010 were included. The thickness of the Occipital Bone and the length and diameter of the C2 pedicle were measured based on CT. Results: The thickest point on the Occipital Bone was in the midline with a maximum thickness below the external Occipital protuberance of 16.2 mm (±3.0 mm), which was thicker than in the Western population. The average C2 pedicle diameter was 5.3 mm (±2.0 mm). This was smaller than Western population pedicle diameters. The average length of the both pedicles to the midpoint of the C2 vertebral body was 23.5 mm (±3.3 mm on the left and ±2.3 mm on the right). Conclusions: The results of this first study in the South East Asian population should help guide and improve the safety in occipito-cervical region instrumentation. Thus reducing the risk of technical failures and neuro-vascular injury.
Kiyomitsu Oyanagi - One of the best experts on this subject based on the ideXlab platform.
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Solitary plasmacytomas of the Occipital Bone: a report of two cases
European radiology, 1997Co-Authors: Kouichirou Okamoto, Jusuke Ito, T. Furusawa, Kunio Sakai, Susumu Tokiguchi, M. Sato, Ryuichi Tanaka, K. Nemoto, Kiyomitsu OyanagiAbstract:The radiological appearances of two cases of solitary plasmacytoma in the Occipital Bone are described. One arose in the lateral part and the other in the squama. They showed characteristic radiological features on CT, MRI and angiography. Bone scintigraphy and gallium scintigraphy were also available. Solitary plasmacytoma of the skull is a rare condition and usually occurs in the calvarium. The skull base is an extremely rare site and only four cases have been reported. The literature of solitary plasmacytoma of the skull is reviewed.
