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Rev. estomatol. Hered ; 30(4): 263-271, Oct-Dec 2020. tab, graf
Article in Spanish | LILACS-Express | LILACS | ID: biblio-1180926


RESUMEN Objetivo: Evaluar el ponticulus posticus según la relación esquelética encontrada en radiografías laterales estrictas en la Centro Dental Docente de la Universidad Peruana Cayetano Heredia durante el período 2015-2017, utilizando la clasificación de acuerdo al grado de mineralización descrita por Selby y la clasificación de la relación esquelética de Steiner. Material y Métodos: Se realizó en radiografías laterales estrictas digitales usando una pantalla de 20 pulgadas utilizando el programa SIDEXIS XG, observando el grado de mineralización del ponticulus posticus: sin evidencia de la espícula ósea sobre la arteria vertebral = puente ausente, cuando se notaba o evidenciaba la formación de la espícula y/o calcificación en medio del puente o en forma incompleta = puente parcial, cuando el arco óseo estaba evidente terminado visualizándose = puente completo y la clasificación de la relación esquelética midiendo el ángulo ANB: Clase I = 0-4°; Clase II = >4° y Clase III = <0°: el análisis estadístico se hizo con el programa SPSS V.22.0 para Windows mediante las pruebas de Chi2. Resultados : De las 925 radiografías laterales estrictas digitales evaluadas se encontró que 283 radiografías presentaron ponticulus posticus y la mayor frecuencia se encontró en el tipo ausente (69,4%), el tipo parcial (17,1%) y el tipo completa (13.5%). El ponticulus posticus se presentó en 25.1% del sexo femenino y en 38.4% en el sexo masculino. La relación esquelética asociada al ponticulus posticus se presentó en la Clase II (19.1%), Clase I (10,4%) y Clase III (1.1%), Conclusiones : El ponticulus posticus es una variante anatómica que se presenta en el 30,6% de los casos. No se encontró diferencia estadísticamente significativa entre la presencia de ponticulus posticus y la relación esquelética o sexo.

SUMMARY Objective: To evaluate the posticus ponticulus according to the skeletal relationship found in strict lateral radiographs at the Teaching Dental Center of the Cayetano Heredia Peruvian University during the period 2015-2017, using the classification according to the degree of mineralization described by Selby and the classification of the Steiner's skeletal relationship. Material and Methods: It was performed on strict digital lateral radiographs using a 20-inch screen using the SIDEXIS XG program, observing the degree of mineralization of ponticulus posticus: no evidence of the bone spicule on the vertebral artery = absent bridge, when it was noted or evidenced the formation of the spicule and / or calcification in the middle of the bridge or in incomplete form = partial bridge, when the bone arch was clearly finished visualizing = full bridge and the classification of the skeletal relationship by measuring the ANB angle: Class I = 0- 4th; Class II => 4th and Class III = <0 °: the statistical analysis was done with the SPSS V.22.0 program for Windows using the Chi2 tests. Results: Of the 925 digital strict lateral radiographs evaluated, it was found that 283 radiographs presented ponticulus posticus and the highest frequency was found in the absent type (69.4%), the partial type (17.1%) and the complete type (13.5 %). Ponticulus posticus occurred in 25.1% of the female sex and in 38.4% of the male sex. The skeletal relationship associated with ponticulus posticus was presented in Class II (19.1%), Class I (10.4%) and Class III (1.1%). Conclusions: Ponticulus posticus is an anatomical variant that occurs in 30.6% of the cases. No statistically significant difference was found between the presence of ponticulus posticus and the skeletal relationship or sex.

Asian Spine Journal ; : 290-295, 2019.
Article in English | WPRIM | ID: wpr-762923


STUDY DESIGN: Retrospective radiological study. PURPOSE: We aimed to determine the prevalence of ponticulus posticus (PP) and high-riding vertebral artery (HRVA) occurring simultaneously on the same side (PP+HRVA) and in cases of PP+HRVA, to assess C2 radio-anatomical measurements for C2 pars length, pedicle width, and laminar thickness. OVERVIEW OF LITERATURE: PP and HRVA predispose individuals to vertebral artery injuries during atlantoaxial fixation. In cases of PP+HRVA, the construct options thus become limited. METHODS: Consecutive computed tomography scans (n=210) were reviewed for PP and HRVA (defined as an internal height of <2 mm and an isthmus height of <5 mm). In scans with PP+HRVA, we measured the ipsilateral pedicle width, pars length, and laminar thickness and compared them with controls (those without PP or HRVA). RESULTS: PP was present in 14.76% and HRVA in 20% of scans. Of the 420 sides in 210 scans, PP+HRVA was present on 13 sides (seven right and six left). In scans with PP+HRVA, the C2 pars length was shorter compared with controls (13.69 mm in PP+HRVA vs. 20.65 mm in controls, p<0.001). The mean C2 pedicle width was 2.53 mm in scans with PP+HRVA vs. 5.83 mm in controls (p<0.001). The mean laminar thickness was 4.92 and 5.48 mm in scans with PP+HRVA and controls, respectively (p=0.209). CONCLUSIONS: The prevalence of PP+HRVA was approximately 3% in the present study. Our data suggest that, in such situations, C2 pedicle width and pars length create important safety limitations for a proposed screw, whereas the translaminar thickness appears safe for a proposed screw.

Axis, Cervical Vertebra , Cervical Atlas , Prevalence , Retrospective Studies , Vertebral Artery
Int. j. morphol ; 35(1): 337-344, Mar. 2017. ilus
Article in English | LILACS | ID: biblio-840975


The ponticulus posticus (PP) is a bridge of bone sometimes found on the atlas vertebra surrounding the vertebral artery and the first cervical nerve root. Sella turcica bridging (STB) is the fusion of anterior and posterior clinoid processes. The objective of this study was to find out the association between STB and PP. For the study, 752 digital lateral cephalograms were retrieved from the archived records of Necmettin Erbakan University, Faculty of Dentistry, Konya, Turkey. There was a significant relationship between the presence of STB and PP (p=0.000, p<0.001). This study indicates that there is a significant correlation between the presence of STB and PP.

El Ponticulus Posticus (PP) es un puente de hueso que se encuentra, a veces, en el atlas y rodea la arteria vertebral y la primera raíz del nervio cervical. El puente de la silla turca (PST) es la fusión de los procesos clinoides anteriores y posteriores. El objetivo de este estudio fue conocer la asociación entre PST y PP. Para el estudio, fueron utilizados 752 cefalogramas digitales laterales, obtenidos de los registros archivados de la Facultad de Odontología de la Universidad Necmettin Erbakan, Konya, Turquía. Hubo una relación significativa entre la presencia de PST y PP (p = 0,000, p <0,001). Este estudio indica que existe una correlación significativa entre la presencia de PST y PP.

Humans , Male , Female , Child , Adolescent , Young Adult , Cervical Atlas/anatomy & histology , Cervical Atlas/diagnostic imaging , Sella Turcica/anatomy & histology , Sella Turcica/diagnostic imaging , Cephalometry , Sex Factors
Rev. chil. neurocir ; 38(1): 29-31, jun. 2012. tab, ilus
Article in English | LILACS | ID: lil-716510


The suboccipital segment of the vertebral artery (VA) passes around the lateral mass of atlas (C1). It is located in a groove on the superior surface of the arch of C1, the so-called vertebral artery sulcus (VAS). Occasionally, a small bony arch is found to connect the retroglenoid tubercle with the posterior arch of C1. This anatomical structure is known as ponticulus posticus (PP). The partial or total incidence of PP reported in the literature ranges from 5.14 percent to 51 percent. The clinical implication of PP includes the cervicogenic migraine, vertigo, and the Barre-Lieou syndrome. The scope of this paper is to determine the incidence of PP in isolated cadaveric vertebrae in the Brazilian population. The cervical vertebrae C1 from thirty not identified adult cadavers were examined at the Laboratory of Anatomy of the Federal University of Sergipe, Brazil. PP was present in 40 percent of evaluated C1 and it involved a complete bony arch in 42 percent of the cases. In 58 percent of the cases, PP was observed bilaterally. In the cases where the presence of PP was unilateral, this structure was situated exclusively on the right, even though a bigger incidence on the left side has been described for the majority of right-handed people. PP was a frequent finding in our study and its presence always must be suspected while setting the diagnosis of cervicogenic chronic headache and cervical pain without radiation to upper limbs.

Humans , Cervical Atlas/abnormalities , Neck Pain , Cervical Vertebrae/pathology , Brazil
Int. j. morphol ; 28(1): 317-322, Mar. 2010. ilus
Article in English | LILACS | ID: lil-579320


The Ponticulus posticus is a bony bridge located in the posterior arch of the atlas in relation to the passage of the vertebral artery. Its presence has been associated with development of cervical pain and cerebrovascular disorders. The purpose of this study was to assess its prevalence in asymptomatic patients. We examined 436 digital teleradiographs of patients aged from 5 to 70 years (mean of 18.44 years, SD. 9.59) of both sexes (173 men, 263 women). In 80.7 percent (n = 352) of cases, no radiographic evidence of ossification was found; 19.3 percent showed some degree of ossification, of which 10.1 percent had partial ossification and 9.2 percent complete ossification. The prevalence of complete ossification was slightly higher in women than in men and occurs in all the age groups analyzed. Our results suggest that the Ponticulus posticus is an anatomic condition with a protective function.

El Ponticulus posticus es un puente óseo ubicado en el arco posterior de atlas en relación al paso de la arteria vertebral. Su presencia se ha asociado al desarrollo de cervicalgias y trastornos vasculares encefálicos. El propósito de este estudio fue analizar su prevalencia en pacientes asintomáticos, para ello fueron examinadas 436 teleradiografías digitales de pacientes de entre 5 y 70 años (Media 18,44 años; DS 9,59), de ambos sexos (173 hombres; 263 mujeres). En el 80,7 por ciento (n=352) no se encontraron signos radiograficos de osificación, el 19,3 por ciento de los casos se pudo apreciar algún grado de osificación, de los cuales el 10,1 por ciento presento una osificación parcial y el 9,2 por ciento completa. La prevalencia de osificación completa fue levemente mayor en mujeres y se presentó en todos los grupos etáreos analizados. Nuestros resultados sugieren que el Ponticulus posticus es una condición anatómica destinada a proteger el paso de la arteria verebral y no debe considerarse una calcificación con significado patológico.

Humans , Male , Adolescent , Adult , Female , Child, Preschool , Child , Middle Aged , Cervical Atlas/abnormalities , Cervical Atlas , Age and Sex Distribution , Cross-Sectional Studies , Chile/epidemiology , Neck Pain , Ossification, Heterotopic , Prevalence
Yonsei Medical Journal ; : 45-49, 2009.
Article in English | WPRIM | ID: wpr-83533


PURPOSE: Since there has been little reporting on the prevalence or morphologic characteristics of ponticulus posticus in Asians, we retrospectively reviewed cervical 3-dimensional CT scan images and plain radiographs which had been ordered by neurosurgeons or orthopaedic surgeons for evaluation of cervical spine problems to investigate the prevalence and morphologic features of the ponticulus posticus in Koreans. PATIENTS AND METHODS: The presence and types of ponticulus posticus were investigated on 200 consecutive cervical 3-D CT scans. RESULTS: Thirty-one patients, 48 ponticulus posticus, complete or partial, bilateral or unilateral, were identified on the 200 cervical 3-D CT scans; therefore, the prevalence was 15.5% in our patient population. In plain radiographs analysis, the prevalence was 6.95%. CONCLUSION: The ponticulus posticus is a relatively common anomaly in Koreans. Therefore, proper identification of this anomaly on preoperative lateral radiographs should alert surgeons to avoid using the ponticulus posticus as a starting point for a lateral mass screw. Because of its size and shape have wide variation, 3-D CT scanning should be considered before lateral mass screw placement into the posterior arch if its presence is suspected or confirmed on radiographs.

Adult , Aged , Cervical Atlas/abnormalities , Female , Humans , Imaging, Three-Dimensional , Korea/epidemiology , Male , Middle Aged , Musculoskeletal Abnormalities/ethnology , Prejudice , Prevalence , Retrospective Studies , Tomography, X-Ray Computed , Young Adult
Asian Spine Journal ; : 27-31, 2007.
Article in English | WPRIM | ID: wpr-158880


STUDY DESIGN: A retrospective review of three-dimensional CT scan images and radiographs. PURPOSE: To investigate the prevalence and morphologic features of ponticulus posticus in Koreans. OVERVIEW OF LITERATURE: There has been little reported on the prevalence or morphologic characteristics of ponticulus posticus in Asians, predisposing them to vertebral artery injury during screw placement in the lateral mass of the atlas. METHODS: The presence and types of ponticulus posticus were investigated on 225 consecutive cervical three-dimensional CT scans and 312 consecutive digital lateral cephalometric head radiographs. RESULTS: Various spectra of ponticulus posticus were found in 26% of the CT scans and 14% of the radiographs. CONCLUSIONS: Ponticulus posticus is a relatively common anomaly in Koreans. Therefore, the presence of this anomaly should be carefully examined for on radiographs before lateral mass screw placement. If ponticulus posticus is suspected or confirmed on radiographs, three-dimensional CT scanning should be considered before placement of lateral mass screws into the posterior arch, especially given its wide variation of size and shape.

Asian Continental Ancestry Group , Head , Humans , Prevalence , Retrospective Studies , Tomography, X-Ray Computed , Vertebral Artery