Comparison of the reproducibility of two cervical vertebrae maturation methods

Aim: Facial orthopaedic treatments based on the stimulation or restrictions of craniofacial bone growth are more effective when carried out during the pubertal growth spurt. The aim of this cross-sectional study was to evaluate the reproducibility of two cervical vertebrae methods (CVM) with manual tracing and direct visual inspection. Methods: A sample of 60 lateral cephalometric radiographs (10 of each of the 6 CVM stages) was randomly selected from 171 records. 5 orthodontists classified these radiographs according to the skeletal maturation stage in 2002 and 2005, and the application of both methods was conducted by direct visual inspection and evaluation through manual tracing. Results: The average reliability of the two methods determination and the two forms of evaluation was substantial. The direct visual inspection evaluation showed the highest reliability and agreement interexaminer values for both methods, as well as the intraexaminers evaluation. Conclusion: The reproducibility of CVM method was substantial, indicating its clinical use to determine the skeletal maturity and the ideal moment for treatment execution

Síndrome de Klippel-Feil en un lactante / Klippel-Feil syndrome in an infant

Se presenta el caso clínico de un lactante de 11 meses de edad, quien fue remitido a la consulta de Genética Clínica del Centro Provincial de Genética Médica de la provincia de Holguín, por presentar dismorfias faciales asociadas a retardo motor, cuello corto y disminución de movimientos. Se realizó interrogatorio, examen físico exhaustivo y estudios radiológicos de columna cervical, que mostraron la fusión de vértebras cervicales, lo cual permitió diagnosticar el síndrome de Klippel-Feil. Se proyectó habilitación con ejercicios para fortalecer los músculos paravertebrales y se brindó asesoramiento genético a la familia.

The case report of an 11 months infant is presented, who was referred to the Clinical Genetics Service of the Medical Genetics Provincial Center in Holguín province, due to facial dysmorphias associated with motor retardation, short neck and decreasing movements. Interrogation, exhaustive physical exam and radiological studies of cervical column were carried out that showed the fusion of cervical vertebras, which allowed to diagnose the Klippel-Feil syndrome. A qualification with exercises was projected to strengthen the paravertebral muscles and genetic advice to the family was provided.

Importância da ginástica laboral na flexibilidade de coluna em servidores do Hospital Universitário / Importance of occupational gymnastics in spine flexibility in workers at the university hospital

Introdução: os cuidados com os trabalhadores é uma importante questão de saúde pública. Objetivo: avaliar os efeitos da ginástica laboral (GL) na flexibilidade da coluna cervical e lombar de servidores do hospital universitário. Materiais e Métodos: trata-se de um estudo experimental. Participaram do estudo, 50 colaboradores distribuídos em dois grupos: Controle (CTL, n=25) e Experimental (EXP, n=25). O grupo CLT não participou das aulas de GL e o grupo EXP realizou 16 sessões de GL, quatro vezes por semana, por quatro semanas. A flexibilidade da coluna cervical e lombar dos participantes foi realizada em dois momentos, antes de iniciarem o programa de GL e após 16 sessões. Resultados: foi verificado que a prática de GL resultou em um aumento da flexibilidade cervical. Em relação à coluna lombar, o período de intervenção não impediu a redução da flexibilidade, no entanto, essa redução foi 50% menor no grupo EXP quando comparado ao grupo CTL. Conclusão: o programa de GL é uma estratégia de intervenção fundamental para a saúde do trabalhador, visto que a flexibilidade é um importante componente da atividade física relacionada à saúde.

Introduction: care of workers is an important public health issue. Objective: to evaluate the effects of occupational gymnastics (OG) on the flexibility of the cervical and lumbar spine of employees at the university hospital. Materials and Methods: this is an experimental study. A total of 50 employees participated in the study, divided into two groups: Control (CTL, n = 25) and Experimental (EXP, n = 25). The CLT group did not participate in the OG classes and the EXP group had 16 OG sessions, which took place four times a week, for four weeks. The flexibility of the cervical and lumbar spine of the participants was assessed in two moments, before starting the OG program and after 16 sessions. Results: it was observed that the practice of OG resulted in an increase in cervical flexibility. Regarding the lumbar spine, the intervention period did not prevent the reduction in flexibility; however, this reduction was 50% lower in the EXP group when compared to the CTL group. Conclusion: the OG program is a fundamental intervention strategy for workers' health, since flexibility is an important component of physical activity related to health.

Implicaciones clínicas asociadas a las variantes anatómicas del número y forma del foramen transverso en vértebras cervicales secas / Clinical implication of anatomical variants of number and shape of the transverse foramen in dry cervical vertebrae

RESUMEN: Las vértebras cervicales presentan como característica distintiva un foramen transverso bilateral, cualquier modificación en la embriogénesis, genera variantes del tamaño, número y forma, lo que puede conllevar diversos problemas neurológicos. Realizamos un estudio observacional y descriptivo de vértebras cervicales, en el que se observó y clasificó el número, la forma y lateralidad de los forámenes transversos principales y accesorios, en una muestra disponible en el anfiteatro de la Universidad de Boyacá, Colombia. Se tomó registro fotográfico especializado. De las 13 vértebras con foramen transverso accesorio, seis fueron unilaterales y siete bilaterales, predominando la forma ovalada con dirección a la derecha. El nivel más común de duplicación fue C4 (dos incompletos y siete completos) y el menos común fue C1, C2 y C5. El conocimiento de estas variantes anatómicas por parte de radiólogos, cirujanos y neurocirujanos, contribuye a la planeación de los abordajes quirúrgicos, favoreciendo la instrumentación de la región cervical y evitando iatrogenias o desenlaces fatales.

SUMMARY: Cervical vertebrae present bilateral transverse foramen, any modification in embryogenesis, generates variants of size, number and shape, which are associated with various neurological problems. Descriptive and observational study of cervical vertebrae, of the number, shape and laterality of the main and accessory transverse foramina were observed and classified. Specialized photographic record was taken. Of the 13 vertebrae with an accessory transverse foramen, six were unilateral and seven bilateral, the oval shape prevailing in the direction to the right. The most common level of duplication was C4(two incomplete and seven complete) and the least commun was C1, C2 and C5. The knowledge of these anatomical variants by radiologists, surgeons and neurosurgeons, contributes to the planning of surgical approaches, favoring the instrumentation of the cervical region avoiding iatrogenic and fatal outcomes.

Congenital atlanto-occipital fusion and its effect on the myodural bridge: a case report utilizing the P45 plastination technique / Fusión atlanto-occipital congénita y su efecto sobre el puente miodural: reporte de un caso utilizando la técnica de plastinación P45

SUMMARY: The atlanto-occipital joint is composed of the superior fossa of the lateral masses of the atlas (C1) and the occipital condyles. Congenital Atlanto-occipital fusion (AOF) involves the osseous union of the base of the occiput (C0) and the atlas (C1). AOF or atlas occipitalization/assimilation represents a craniovertebral junction malformation (CVJM) which can be accompanied by other cranial or spinal malformations. AOF may be asymptomatic or patients may experience symptoms from neural compression as well as limited neck movement. The myodural bridge (MDB) complex is a dense fibrous structure that connects the suboccipital muscular and its related facia to the cervical spinal dura mater, passing through both the posterior atlanto-occipital and atlanto-axial interspaces. It is not known if atlas occipitilization can induce structural changes in the MDB complex and its associated suboccipital musculature. The suboccipital region of a cadaveric head and neck specimen from an 87-year-old Chinese male having a congenital AOF malformation with resultant changes to the MDB complex was observed. After being treated with the P45 plastination method, multiple slices obtained from the cadaveric head and neck specimen were examined with special attention paid to the suboccipital region and the CVJM. Congenital atlanto-occipital fusion malformations are defined as partial or complete fusion of the base of the occiput (C0) with the atlas (C1). In the present case of CVJM, unilateral fusion of the left occipital condyle with the left lateral mass of C1 was observed, as well as posterior central fusion of the posterior margin of the foramen magnum with the posterior arch of C1. Also noted was a unilateral variation of the course of the vertebral artery due to the narrowed posterior atlanto-occipital interspace. Surprisingly, complete agenesis of the rectus capitis posterior minor (RCPmi) and the obliques capitis superior (OCS) muscles was also observed in the plastinated slices. Interestingly, the MDB, which normally originates in part from the RCPmi muscle, was observed to originate from a superior bifurcation within an aspect of the nuchal ligament. Therefore, the observed changes involving the MDB complex appear to be an effective compensation to the suboccipital malformations.

RESUMEN: La articulación atlanto-occipital está compuesta por las caras articulares superiores de las masas laterales del atlas (C1) y los cóndilos occipitales. La fusión atlanto-occipital congénita (FAO) implica la unión ósea de la base del occipucio (C0) y el atlas (C1). La FAO u occipitalización/asimilación del atlas representa una malformación de la unión craneovertebral (MUCV) que puede presentar otras malformaciones craneales o espinales. La FAO puede ser asintomática o los pacientes pueden experimentar síntomas de compresión neural así como movimiento limitado del cuello. El complejo del puente miodural (PMD) es una estructura fibrosa densa que conecta el músculo suboccipital y su fascia relacionada con la duramadre espinal cervical, pasando a través de los espacios intermedios atlanto-occipital posterior y atlanto-axial. No se sabe si la occipitilización del atlas puede inducir cambios estructurales en el complejo PMD y en la musculatura suboccipital. Se observó en la región suboccipital de un espécimen cadavérico, cabeza y cuello de un varón chino de 87 años con una malformación congénita de FAO con los cambios resultantes en el complejo PMD. Se examinaron múltiples cortes obtenidos de la muestra de cabeza y cuello después de ser tratados con el método de plastinación P45, con especial atención a la región suboccipital y la MUCV. Las malformaciones congénitas por fusión atlanto-occipital se definen como la fusión parcial o completa de la base del occipucio (C0) con el atlas (C1). En el presente caso de MUCV se observó la fusión unilateral del cóndilo occipital izquierdo con la masa lateral izquierda de C1, así como fusión posterior central del margen posterior del foramen magnum con el arco posterior de C1. También se observó una variación unilateral del curso de la arteria vertebral por el estrechamiento del espacio interatlanto-occipital posterior. Se observó además agenesia completa de los músculos Rectus capitis posterior minor (RCPmi) y oblicuos capitis superior (OCS) en los cortes plastinados. Curiosamente, se observó que el MDB, que normalmente se origina en parte del músculo RCPmi, se origina en una bifurcación superior dentro de un aspecto del ligamento nucal. Por lo tanto, los cambios observados en el complejo PMD parecen ser una compensación de las malformaciones suboccipitales.

Skeletal maturation pattern among Down Syndrome individuals in Benin, City. Nigeria

Background: The assessment of skeletal maturity is important in the timing of orthodontic treatment especially in the modification of dento-facial growth. The use of cervical vertebrae as a method of assessment of skeletal maturity has rarely been used among Down Syndrome. Objective: To assess skeletal maturity among individuals with Down Syndrome using the cervical vertebrae maturation stages. Methods: The study was conducted among 21 Down Syndrome with mean ages of 11.70  1.83 years (males) and 13.64  1.75 years (female); and 21 control individuals with mean ages of 12.00  2.00 years (male), and 13.50  1.90 years (female). The independent t-test and chi-square test were used to determine significant differences among the continuous (age) and categorical variables (cervical vertebrae maturation stages) respectively when matched with gender and chronological age. Fischer exact test was used when an expected frequency presentation was <5. A p-value of < 0.05 was set as statistically significant. Results: Down Syndrome males had delayed maturation at 11 years but accelerated at 12 with early attainment of maturity at 15 years. Down Syndrome female had a delay tendency in skeletal maturation from 11­15 years of age. Overall, Down Syndrome had a 1.242 probability of either having a delay or advancement in skeletal maturation which was not statistically significant. Conclusively, the skeletal maturation pattern between Down syndrome patients and normal individuals was not statistically different. Conclusion: The average timing for commencement of orthodontic treatment especially growth modification for normal individuals can be applied for individuals with Down Syndrome as this present study did not show any statistically significant difference in their overall skeletal maturation.

The consequence of head-loading on the neuro-musculoskeletal health of the ILembe District youth of KwaZulu-Natal

Background: Head-loading, as a mode of transporting food, water and firewood, is a longstanding tradition assigned to female South African youth and has been associated with adverse health consequences. Objectives: This study determined the impact of head-loading on the neuromusculoskeletal health and proprioception of female South African youth. Method: This study comprised a counterbalanced, within-subject, single-factor experimental design which compared the changes that occurred when the same independent variable (head-loading) within two homogenous groups was measured in terms of the dependent variables (outcomes: neuromusculoskeletal pain and proprioception) at two time periods, before and after the introduction of the independent variable. A cohort of South African female youth (n = 100), aged 9­17 years, voluntarily partook in the study. The participants were randomly distributed into an experimental (n = 50) and a control (n = 50) group. The experimental group stood in a head-loaded state with their respective habitual head-load mass. Their proprioception measurements were compared during their unloaded versus loaded states, with the proprioceptive measurements including the total proprioception index, the anterior­posterior (front­back) index and the medial­lateral (side-to-side) index. Participants furthermore completed a head-loading health-related questionnaire. Results: Participants had a mean age of 12.3 ± 2.5 years, body mass of 44.4 ± 13.7 kg, stature of 145 ± 10 cm and a head-load mass of 8.0 ± 2.5 kg. Participants had poorer medial­lateral proprioception during head-loading as compared to their unloaded state (1.4 ± 0.8 as compared to 1.6 ± 0.9) (p < 0.05). Most youth (96%) experienced neuromusculoskeletal pain in their cervical vertebrae (40.9%), shoulders (27.3%), lumbar vertebrae (10.7%), arms (8.3%), legs (8.3%), knees (1.9%), fingers (1.5%), toes (0.5%) and thoracic vertebrae (0.5%) (χ2: p < 0.05). Conclusion: Head-loading adversely affects the medial­lateral proprioception and neuromusculoskeletal health of participants.

Establishment of finite element model of anterior cervical transpedicular system for reconstruction of cervical stability after subtotal resection of two segments of lower cervical spine / 中国骨伤

OBJECTIVE@#To establish the fixation model of anterior cervical transpedicular system (ACTPS) after subtotal resection of two segments of lower cervical spine(C3-C7) in order to provide a finite element modeling method for anterior cervical reconstruction.@*METHODS@#The CT data of the cervical segment (C1-T1) of a 30-year-old adult healthy male volunteer was collected. Used Mimics 10.0, Rapidform XOR3, HyperMesh 10.0, CATIA5V19 and ANSYS 14.0 to establish the three-dimensional nonlinear complete model of lower cervical spine(C3-C7) as the intact group. The number of units and nodes of the complete model were recorded. After the effectiveness of the complete model was verified, the C5 and C6 vertebral subtotal resection was performed, and the ACTPS model was established as the ACTPS group. The axial force of 75 N and moment couple of 1N·m was loaded on the upper surface of C3 in intact group and ACTPS group, the range of motion(ROM)and stress distribution in states of flexion extension, lateral flexion, rotation was compared between two groups.@*RESULTS@#There were 85 832 elements and 23 612 nodes in the complete model of lower cervical spine(C3-C7) which was established in this experiment. The stress distribution of ACTPS internal fixation model was relatively uniform. Comparing with the intact group, the overall range of motion in ACTPS group was decreased in flexion extension, lateral flexion and rotation directions, and the corresponding compensation of adjacent C3,4 segment was increased slightly.@*CONCLUSION@#The stress distribution of ACTPS fixation system is uniform, there is no stress concentration area at the joint of screw and titanium plate, and the fracture risk of internal fixation is low. It is suitable for stability reconstruction after anterior decompression of two or more cervical segments.

Manual therapy combined with posterior percutaneous endoscopic cervical decompression for the treatment of cervical spondylotic radiculopathy / 中国骨伤

OBJECTIVE@#To explore the clinical efficacy and safety of manual therapy combined with posterior percutaneous endoscopic cervical decompression(PECD) in the treatment of intractable cervical spondylotic radiculopathy.@*METHODS@#From May 2016 to May 2018, 23 CSR patients who responded poorly to conservative treatment for at least 6 weeks underwent the combination management. Firstly, the patients received the posterior percutaneous endoscopic cervical decompression routine care for the following 4 weeks and manual therapy for another 4 weeks. A total of 23 patients were followed up, including 14 males and 9 females, the age ranged from 29 to 78 years old with an average of (50.30±12.28) years, the course of disease was 3 to 24 months with an average of (9.74±5.76) months. The lesion segment involved C4,5 in 4 cases, C5,6 in 13 cases, C6,7 in 6 cases. The visual analogue scale (VAS), neck disability index (NDI), changes of cervical physiological curvature and interbody stability, adverse events were observed before and after operation. The follow-up time points were before operation, 1 day after operation and 1, 3 and 6 months after operation.@*RESULTS@#All patients successfully completed the operation and manual treatment for 4 to 8 times. Among the 29 cases, 23 patients were followed up for more than 6 months. There was no spinal cord and nerve root injury during the treatment and follow-up. Operation time was from 80 to 120 min with a median of 90 min;intraoperative blood loss was from 35 to 80 ml with a median of 50 ml. NDI, VAS of neck, shoulder and arm each period after operation were significantly lower than those before PECD(P<0.05), while there were no significant improvement in cervical physiological curvature and target segment intervertebral space height(P>0.05);there was no significant change in interbody stability (P>0.05). After received the manual therapy, NDI significantly decreased (P<0.05), however, there was no significant difference in VAS of neck, shoulder and arm, physiological curvature of cervical spine and intervertebral space height of target segment compared with that before manual treatment (P>0.05);there was no significant change in interbody stability (P>0.05).@*CONCLUSION@#Manual therapy combined with PECD in the treatment of intractable cervical spondylotic radiculopathy can not only quickly improve the symptoms, but also alleviate the residual symptoms after PECD safely and effectively, and can not cause obvious signs of accelerated instability of cervical adjacent segments in the short term.

A case-control study:the clinical efficacy of total laminectomy with lateral mass screw fixation and single open-door laminoplasty for cervical spinal cord injury without fracture and dislocation / 中国骨伤

OBJECTIVE@#To compare the clinical effects of total laminectomy with lateral mass screw fixation and single open-door laminoplasty in the treatment of cervical spinal cord injury without fracture and dislocation.@*METHODS@#The clinical data of 75 patients with cervical spinal cord injury without fracture and dislocation treated from December 2014 to April 2020 were retrospectively analyzed, including 65 males and 10 females, aged from 33 to 83 years old with an average of (60.1±11.4) years. According to surgical method, the patients were divided into observation group (36 cases) and control group (39 cases). The observation group was treated with C3-C6 single open-door laminoplasty. In the control group, the C3-C6 whole lamina was opened by "uncovering", and the lateral mass screw was fixed and fused. The general conditions including operation time, intraoperative blood loss, hospital stay and complications such as axial pain, cerebrospinal fluid leakage, postoperative C5 nerve palsy were recorded. Visual analogue scale(VAS), Nurick pain scale, Japanese Orthopaedic Association(JOA) scores and American Spinal Injury Association(AISA) injury scale were used to evaluate the improvement of clinical symptoms and related functional recovery 12 months after operation.@*RESULTS@#There were no statistically significant differences in operation time, intraoperative blood loss and hospital stay between two groups(P>0.05). There were statistically significant differences in JOA, VAS, ASIA and Nurick scores of the all patients between 12 months after surgery and before surgery (P<0.05), and there was no significant difference between groups. There was significant difference in the incidence of C5 nerve root palsy and axial pain between two groups(P<0.05), but there was no significant difference in the complications of cerebrospinal fluid leakage between two groups (P>0.05).@*CONCLUSION@#Total laminectomy with lateral mass screw fixation and single open-door laminoplasty in treating cervical spinal cord injury without fracture and dislocation can obtain satisfactory results in restoring nerve function, alleviating pain and improving daily behavior, but single open-door laminoplasty has the advantages of less trauma and low incidence of complications.

Correlative analysis of cervical curvature and atlantoaxial instability / 中国骨伤

OBJECTIVE@#To investigate the correlation between the changes of cervical curvature and atlantoaxial instability.@*METHODS@#The correlation between the changes of cervical curvature and atlantoaxial instability was retrospectively studied in 50 outpatients with abnormal cervical curvature (abnormal cervical curvature group) from January 2018 to December 2019. There were 24 males and 26 females in abnormal cervical curvature group, aged from 18 to 42 years old with an average of(30.62±5.83) years. And 53 patients with normal cervical curvature (normal cervical curvature group) during the same period were matched, including 23 males and 30 females, aged from 21 to 44 years with an average of(31.98±6.11) years. Cervical spine X-ray films of 103 patients were taken in lateral position and open mouth position. Cervical curvature and variance of bilateral lateral atlanto-dental space(VBLADS) were measured and recorded, Pearson correlation coefficient analysis was used to study the correlation between the changes of cervical curvature and atlantoaxial instability.@*RESULTS@#Atlantoaxial joint instability accounted for 39.6%(21/53) in normal cervical curvature group and 84.0%(42/50) in abnormal cervical curvature group. There was significant difference between two groups(P<0.01). VBLADS in abnormal cervical curvature group was (1.79±1.01) mm, which was significantly higher than that in normal cervical curvature group(0.55±0.75) mm(P<0.01). Pearson correlation coefficient analysis showed that the size of cervical curvature was negatively correlated with VBLADS.@*CONCLUSION@#Cervical curvature straightening and inverse arch are the cause of atlantoaxial instability, the smaller the cervical curvature, the more serious the atlantoaxial instability.

Correlación entre los estadios de maduración ósea de las vértebras cervicales y los estadios de formación del canino mandibular / Correlação entre os estágios de maturação óssea das vertebras cervicais e os estágios de formação do mandibular canino / Correlation between the skeletal maturation of the cervical vertebrae and stage of mandibular canine calcification

Resumen: La evaluación de la maduración ósea es de gran importancia en la toma de decisiones con respecto al plan de tratamiento de diferentes maloclusiones que pueden depender del pico de crecimiento mandibular. El objetivo de este estudio fue evaluar la correlación entre las etapas de calcificación del canino mandibular permanente observadas en la radiografía panorámica con los estadíos de maduración cervicales observados en la radiografía cefálica lateral. Materiales y Métodos: Se realizó un estudio descriptivo, transversal y correlacional, evaluando los estadios de maduración ósea de las vértebras cervicales utilizando el método de Baccetti, y los estadios de desarrollo del canino mandibular utilizando las etapas descritas por Demirjian. La muestra estuvo conformada por radiografías panorámicas y cefálicas laterales de 81 sujetos (hombres y mujeres) con una edad comprendida entre los 9 y los 14 años. Las variables fueron comparadas mediante estadística inferencial utilizando tablas de contingencia y la pruebas Chi2 de Pearson. Resultados: La correlación entre la maduración dental y cervical para el género masculino fue de 0,689 y para el femenino de 0,690 p<0,001. Las etapas F y G observadas en el canino mandibular coincidieron con las etapas CS1 y CS3 de maduración respectivamente. Conclusión: se observó que las etapas de formación radicular del canino mandibular presentan relación con las etapas de maduración cervical siendo útil su determinación para inferir cercanía del pico de crecimiento prepuberal.

Resumo: A avaliação da maturação óssea é de grande importância na tomada de decisões quanto ao plano de tratamento das diferentes maloclusões que podem depender do pico de crescimento mandibular. O objetivo deste estudo foi avaliar a correlação entre as etapas de calcificação de caninos mandibulares permanentes observados na radiografia panorâmica com os estágios de maturação cervical observados na radiografia cefálica lateral. Materiais e Métodos: Foi realizado um estudo descritivo, transversal e correlacional, avaliando os estágios de maturação óssea das vértebras cervicais pelo método de Baccetti e os estágios de desenvolvimento dos caninos inferiores pelas etapas descritas por Demirjian. A amostra foi composta por radiografias cefálicas panorâmicas e laterais de 81 indivíduos (homens e mulheres) com idade entre 9 e 14 anos. As variáveis foram comparadas por estatística inferencial por meio de tabelas de contingência e testes Chi2 de Pearson. Resultados: A correlação entre a maturação dentária e cervical para o gênero masculino foi de 0,689 e para o feminino, 0,690 p <0,001. As etapas F e G observadas no canino inferior coincidiram com as etapas CS1 e CS3 de maturação, respectivamente. Conclusão: observou-se que os estágios de formação radicular do canino inferior estão relacionados aos estágios de maturação cervical, sendo sua determinação útil para inferir a proximidade do pico de crescimento pré-púbere.

Abstract: Orthodontic treatment plan decisions may rely on establishing the timing of the mandibular growth peak, thus the evaluation of skeletal maturation is of importance. The aim of this study was to determine the correlation between the stages of permanent mandibular canine calcification observed in the panoramic radiography with the cervical maturation stages observed in the lateral cephalic radiography. Materials and Methods: A descriptive, cross-sectional and correlational study was performed evaluating the stages of bone maturation of the cervical vertebrae using the Baccetti method, and the stages of development of the mandibular canine using the stages described by Demirjian. The sample consisted of panoramic and lateral cephalic radiographs, obtained from 81 subjects (men and women) with ages between 9 and 14 years. The variables were compared using inferential statistics using contingency tables and Pearson's Chi2 tests. Results: The correlation between dental and skeletal maturation found for the males was 0.689 and for females, 0.690 (p <0.001). The F and G stages observed in the mandibular canine coincided with the stages CS1 and CS3 maturation respectively. Conclusion: Dental formation stages for the mandibular canine are related to cervical maturation stages and may be useful to infer timing of prepuberal growth peak.

Estudos radiográficos do osso hioide e da coluna cervical nas maloclusões Classe I e Classe II/2ª Divisão de Angle / Radiographic studies of the hyoid bone and cervical spine in Angle Class I and Class II/2nd Division malocclusions

Introduction Interdisciplinary investigative study of the stomatognathic-cervical complex, necessary to understand the structure and biomechanics of the hyoid bone and cervical spine in Class I and II / 2nd Division participants. Objective To analyze the position of the hyoid bone and the curvature of the cervical spine on lateral radiographs of participants with Class I and II/2nd Division Angle malocclusion. Material and method We evaluated the position of the hyoid bone from its alignment with the corresponding cervical vertebra. The presentation of curvature of the cervical spine was evaluated from the fourth cervical vertebra. Result There was a statistically significant difference in the position of the hyoid bone (p=0.027) between the classes, which was located at C3 in Class I and further down, between C3 and C5, in Class II/2nd Division. The cervical spine showed alterations in both classes, with an increase, rectification, and inversion of the curvature with no statistical difference between them (p=0.533). Conclusion In this study, the hyoid bone showed different positions in the malocclusions studied, however, poor posture of the cervical spine was common in both classes.

Introdução Estudo interdisciplinar investigativo do complexo estomatognático-cervical, necessário para compreender a estrutura e a biomecânica do osso hioide e coluna cervical em participantes Classe I e II/2ª Divisão de Angle. Objetivo Analisar a posição do osso hioide e da curvatura da coluna cervical nas radiografias em perfil de participantes com má oclusão Classes I e II/2ª Divisão de Angle. Material e método A posição do osso hioide foi avaliada a partir de seu alinhamento com a vértebra cervical correspondente. A apresentação da curvatura da coluna cervical foi determinada a partir da proximidade com a quarta vértebra cervical. Resultado Houve diferença estatística significativa na posição do osso hioide (p=0,027) entre as classes, que ficou situado em C3 na Classe I e mais abaixo, entre C3 e C5, na Classe II/2ª Divisão. A coluna cervical apresentou alterações em ambas as classes sem diferença estatística entre as mesmas (p=0,533), com aumento, retificação e inversão da curvatura. Conclusão Neste estudo, o osso hioide apresentou posições distintas nas más oclusões estudadas, no entanto, a má postura da coluna cervical foi comum em ambas as classes.

Correlation analysis of cervical spine dysfunction, pain and muscle strength in office workers / 中华劳动卫生职业病杂志

Objective: To expore the correlation between neck disability, neck pain and muscle strength in cervical pondylosis of office worker, and to provide scientific basis for the prevention and treatment of cervical spondylosis. Methods: In April 2021 ,234 patients with cervical spondylotic myelopathy treated in the Subsidiary Rehabilitation Hospital of Fujian University of Traditional Chinese Medicine from April 2015 to April 2017 were selected, the correlation between Neck Disability Index (NDI) score, neck pain and muscle strength was analyzed using the Spearman rank correlation method. Mann-Whitney U test was used to compare the difference of maximum muscle strength of isometric contraction. Results: NDI score was negatively correlated with neck flexion, extension, and muscle strength in the left and right flexion directions (r(s)=-0.164, -0.169, -0.222, -0.176, P=0.012, 0.010, 0.001 , 0.007). In mild and moderate functional disorder patients, the muscle strength in flexion, extension and left and right flexion direction was greater, the difference was statistically significant (P <0.01). Conclusion: There is a negative correlation between cervical functional disorder and cervical muscle strength in office workers, suggesting that strengthening cervical muscle strength may be a way to improve cervical spine function.

Early efficacy of three dimensional printed anatomical biomimetic cervical artificial disc replacement in the treatment of cervical degenerative diseases / 中华外科杂志

Objective: To investigate the efficacy and safety of a new cervical artificial disc prosthesis in the treatment of cervical degenerative diseases. Methods: The clinical data of 18 patients with single-level cervical degenerative diseases who underwent three dimensional printed anatomical bionic cervical disc replacement at Department of Spinal Surgery,Honghui Hospital,Xi'an Jiaotong University from May 2019 to July 2020 were analyzed retrospectively. There were 7 males and 11 females,aged (45±8) years old(range:28 to 58 years).The surgical segment was located at C3－4 level in 2 cases, C4－5 level in 5 cases, C5－6 level in 9 cases, and C6－7 level in 2 cases.The clinical and radiographic outcomes were recorded and compared at preoperative,postoperative times of one month and twelve months.The clinical assessments contained Japanese orthopedic association (JOA) score,neck disability index (NDI) and visual analogue scale (VAS).Imaging assessments included range of motion (ROM) of cervical spine, prosthesis subsidence and prosthesis anteroposterior migration.Repeated measurement variance analysis was used for comparison between groups,and paired t test was used for pairwise comparison. Results: All patients underwent the operation successfully and were followed up for more than 12 months.Compared with preoperative score,the JOA score,NDI and VAS were significantly improved after surgery (all P<0.01).There was no significant difference in postoperative ROM compared with 1-and 12-month preoperative ROM (t=1.570,P=0.135;t=1.744,P=0.099). The prosthesis subsidence was (0.29±0.13) mm (range: 0.18 to 0.50 mm) at 12-month postoperatively.The migration of prosthesis at 12-months postoperatively were (0.71±0.20) mm (range: 0.44 to 1.08 mm).There was no prosthesis subsidence or migration>2 mm at 12-month postoperatively. Conclusion: Three dimensional printed anatomical biomimetic cervical artificial disc replacement has a good early clinical effect in the treatment of cervical degenerative diseases, good mobility can be obtained while maintaining stability.

The development of artificial cervical disc replacement from the perspective of orthopedic bionic therapy / 中华外科杂志

The modern surgical treatment of cervical degenerative disc disease can be traced back to the advent of anterior cervical decompression and fusion.With the emergence of fusion-related complications,different scholars have promoted the gradual transformation of cervical degenerative disc diseases from "fusion fixation" to "non-fusion reconstruction" through in-depth fusion with materials science,engineering mechanics and other disciplines.The innovation of this treatment concept is consistent with the original intention of "structural remodeling,functional reconstruction,maximum repair and reconstruction of the morphology and function of skeletal muscle system" in orthopedic bionic treatment,which is essentially in line with the "bionic alternative therapy" in orthopedic bionic therapy.This paper focuses on the surgical treatment of cervical degenerative disc diseases,reviews the development history of artificial cervical disc replacement,analyzes the evolution from orthopedic biomimetic therapy,and explores a new direction for the design of artificial cervical disc prostheses and the treatment of cervical degenerative disc diseases in the future.

Buckling of the Ligamentum Flavum as a Rare Complication of Anterior Cervical Corpectomy and Fusion: A Case Report

Introduction and Importance Neurological deterioration due to buckling of the ligamentum flavum (LF) is an uncommon complication after anterior cervical corpectomy or discectomy with fusion. Case Presentation In this report, we present the case of a 66-year-old male who underwent anterior cervical partial corpectomy of C5 and discectomy of prolapsed C5- C6 with fusion. Postsurgery, the patient displayed signs of neurological deterioration. Upon immediate cervical magnetic resonance imaging (MRI), posterior canal stenosis and severe compression with cord signal due to LF buckling were detected. A posterior laminectomy procedure and canal decompression at the C5-C6 level with bone fusion were performed. Clinical Discussion Patient presented with walking difficulty, then walking disability, followed by bilateral upper and lower limb paresthesia with burning sensation. Examination showed ⅘ muscle strength in both handgrips. Further investigation showed brisk deep tendon reflexes, positive Hoffman sign unilaterally, equivocal Babinski sign, and progressive quadriparesis. Magnetic resonance imaging showed mild and diffuse building of some cervical discs, with spinal cord progression. We performed an anterior cervical corpectomy and fusion (ACCF) and anterior cervical discectomy and fusion (ACDF); a titanium mesh with plates and screws was used for fusion, with removal of a calcified and herniated subligamentous disc. Postoperatively, upper and lower limb strength deteriorated; immediate cervical and thoracic MRI showed LF buckling, which caused canal stenosis and severe compression. Urgent posterior laminectomy and canal decompression with bone fusion was scheduled on the same day. The patient underwent physiotherapy and regained upper and lower limb strength and his ability to walk. Conclusion This indicates the possibility of neurological deterioration as a result of LF buckling, whichmay be a result of LF thickening accompanied by hyperextension in the cervical region. In this regard, immediate imaging following signs of neurological complications after anterior cervical corpectomy or discectomy warrants early detection, which results in a better prognosis.

Análise dos sintomas osteomioarticulares pelo uso de tecnologias portáteis em docentes de uma instituição privada / Analysis of musculoskeletal symptoms by the use of portable technologies in teachers of a private institution

As tecnologias portáteis cada vez mais estão sendo utilizadas e tornaram-se necessárias para o dia a dia da população de maneira geral, entretanto, o uso em excesso, más posturas durante o uso, padrão inadequado ergonômico, potencializado pelo sedentarismo, estresse, expõem seus usuários a riscos de desenvolver processos agudos e crônicos de dor e possíveis lesões osteomioarticulares. Objetivo: Analisar a prevalência dos sintomas osteomioarticulares pelo uso de tecnologias portáteis em docentes de uma instituição privada. Materiais e métodos: Trata-se de um estudo descritivo e observacional transversal, de caráter quantitativo, composta por uma amostra de 68 docentes do centro de ciências biológicas e da saúde na Universidade da Amazônia. As variáveis encontradas foram mensuradas e tabuladas visando eliminar erros utilizando o software microsoft excel, assim como, foram feitas análises descritas dos dados através do software bioestat. Resultados: Como resultados, foi constatado que docentes de uma instituição privada apresentam em grande maioria sintomas osteomioarticulares pelo uso de tecnologias portáteis, principalmente para a região cervical (49% dos participantes), seguido da região lombar (46% dos participantes) obtendo valores significantes para esses e demais achados(p<0,05). Conclusão: Os resultados deste estudo apresentam importância sobre vários segmentos, principalmente para os docentes, pois fornece fundamentais informações e descrições acerca do uso de tecnologias portáteis e possíveis repercussões no sistema osteomioarticular. (AU)

Portable technologies are increasingly being used and have become necessary for the daily life of the population in general, however, overuse, bad postures during use, inadequate ergonomic pattern, enhanced by sedentary lifestyle, stress, expose their users at risk of developing acute and chronic pain processes and possible musculoskeletal injuries. Objective: To analyze the prevalence of musculoskeletal symptoms through the use of portable technologies in teachers of a private institution. Materials and methods: It is a descriptive and observational cross-sectional study, of quantitative character, composed of a sample of 68 professors from the center of biological sciences and health at the University of the Amazon. The variables found were measured and tabulated in order to eliminate errors using the microsoft excel software, as well as described analyzes of the data using the bioestat software. Results: As a result, it was found that professors at a private institution mostly present musculoskeletal symptoms due to the use of portable technologies, mainly for the cervical region (49% of the participants), followed by the lumbar region (46% of the participants) obtaining significant values for these and other findings (p <0.05). Conclusion: The results of this study are important in several segments, mainly for teachers, as it provides fundamental information and descriptions about the use of portable technologies and possible repercussions on the osteomioarticular system. (AU)