4,186 results match your criteria Os Odontoideum


Atlas of Human Skeleton Hardness Obtained Using the Micro-indentation Technique.

Orthop Surg 2021 May 11. Epub 2021 May 11.

Key Biomechanics Lab of Hebei Province, The Third Hospital of Hebei Medical University, Shijiazhuang, China.

Objectives: Measure and systematically evaluate the distribution of microhardness in the human skeleton.

Methods: Three fresh corpses were obtained, aged 62 (male), 45 (female), and 58 years (male). Soft tissues were removed, and all axial and unilateral appendicular bones were freshly harvested. Read More

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Feasibility of Single-Stage Posterior Passive Correction and Fusion Surgery for Congenital Scoliosis in Adolescent Patients Who Have Attained Skeletal Maturity.

Asian Spine J 2021 May 7. Epub 2021 May 7.

Department of Orthopaedic Surgery, National Orthopaedic Centre of Excellence for Research and Learning, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia.

Study Design: Retrospective study.

Purpose: To report the perioperative and radiological outcomes of single-stage posterior passive correction and fusion (SSPPCF) in adolescent patients who present with congenital scoliosis.

Overview Of Literature: The surgical treatment for congenital scoliosis is complex. Read More

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Atlantoaxial Stabilization by Posterior C1 and C2 Screw-Rod Fixation for Various Pathologies: Case Series and Comprehensive Review of Literature.

J Neurosci Rural Pract 2021 Apr 3;12(2):228-235. Epub 2021 Mar 3.

Department of Neurosurgery, Government Medical College, Kozhikode, Kerala, India.

We retrospectively analyzed atlantoaxial dislocation (AAD) of various pathologies, namely, rheumatoid arthritis (RA), os odontoideum, and trauma. Various techniques were discussed in relation to C1-C2 stabilization. The study aims to share our clinical experience in a series of six cases of C1-C2 instability that underwent posterior C1-C2 fusion, with free hand technique and limited fluoroscopy. Read More

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[Treatment strategy and curative effect analysis of os odontoideum complicated with atlantoaxial joint dislocation].

Zhongguo Gu Shang 2021 Apr;34(4):321-7

Department of Spine Surgery, Zhejiang Ningbo No.6 Hospital, Ningbo 315040, Zhejiang, China.

Objective: To explore the treatment strategy and clinical efficacy for os odontoideum complicated with atlantoaxial dislocation.

Methods: The clinical data of 17 patients with os odontoideum complicated with atlantoaxial dislocation surgically treated from January 2006 to January 2015 were retrospectively analyzed, including 7 males and 10 females, aged 17 to 53 (43.1±11. Read More

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Effect of age-adjusted alignment goals and distal inclination angle on the fate of distal junctional kyphosis in cervical deformity surgery.

J Craniovertebr Junction Spine 2021 Jan-Mar;12(1):65-71. Epub 2021 Mar 4.

Department of Neurological Surgery, University of California, San Francisco, CA, USA.

Background: Age-adjusted alignment targets in the context of distal junctional kyphosis (DJK) development have yet to be investigated. Our aim was to assess age-adjusted alignment targets, reciprocal changes, and role of lowest instrumented level orientation in DJK development in cervical deformity (CD) patients.

Methods: CD patients were evaluated based on lowest fused level: cervical (C7 or above), upper thoracic (UT: T1-T6), and lower thoracic (LT: T7-T12). Read More

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Conservative treatment and outcome of upper cervical spine fractures in young children: A STROBE-compliant case series.

Medicine (Baltimore) 2021 Apr;100(13):e25334

Department of Pediatric Surgery, University Children's Hospital Basel, University of Basel, Switzerland.

Abstract: Cervical spine (C-spine) fractures in young children are very rare, and little information on treatment modalities and functional, radiographic, and patient-reported outcome exists. In this 2-center, retrospective case series, we assessed subjective and functional mid-term outcomes in children aged ≤5 years whose C-spine fractures were treated nonoperatively.Between 2000 and 2018, 6 children (median age at injury: 23. Read More

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The relationship between atlas hypoplasia and os odontoideum in children with Down syndrome: a preliminary case report.

J Pediatr Orthop B 2021 Mar 18. Epub 2021 Mar 18.

Department of Pediatric orthopedics, Shizuoka Children's Hospital, Shizuoka Department of Orthopaedic Surgery, Yokohama Rosai Hospital, Kanagawa Department of Orthopaedic Surgery, the University of Tokyo, Tokyo, Japan.

The purpose of this study was to evaluate the relationship of os odontoideum and the size of atlas among children with Down syndrome. Understanding the risk of developing myelopathy in asymptomatic cases is important in children with Down syndrome. Children with os odontoideum are considered to be at high risk of developing myelopathy because of instability; however, in cases that are complicated by atlas hypoplasia, the risk remains the same, regardless of instability. Read More

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Timing of conversion to cervical malalignment and proximal junctional kyphosis following surgical correction of adult spinal deformity: a 3-year radiographic analysis.

J Neurosurg Spine 2021 Mar 19:1-9. Epub 2021 Mar 19.

2Department of Orthopedic Surgery, Hospital for Special Surgery, New York, New York.

Objective: The goal of this study was to assess the conversion rate from baseline cervical alignment to postoperative cervical deformity (CD) and the corresponding proximal junctional kyphosis (PJK) rate in patients undergoing thoracolumbar adult spinal deformity (ASD) surgery.

Methods: The operative records of patients with ASD with complete radiographic data beginning at baseline up to 3 years were included. Patients with no baseline CD were postoperatively stratified by Ames CD criteria (T1 slope-cervical lordosis mismatch [TS-CL] > 20°, cervical sagittal vertical axis [cSVA] > 40 mm), where CD was defined as fulfilling one or more of the Ames criteria. Read More

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The Effect of Cervical Fusion on Functional Sagittal Spinal Alignment Based on the Inflection Point: Case Series Study.

Global Spine J 2021 Mar 15:21925682211001795. Epub 2021 Mar 15.

Department of Orthopedic Surgery, Columbia University, NewYork-Presbyterian Och Spine Hospital, New York, NY, USA.

Study Design: A retrospective radiologic study.

Objective: The inflection point is the disc space between a lordotic and kyphotic segment of spine. To our knowledge, there has been no study evaluating changes in functional sagittal alignment determined by inflection points after cervical fusion surgery. Read More

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Image measurements of os odontoideum in children.

Transl Pediatr 2021 Feb;10(2):388-393

Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Zhejiang Spine Surgery Center, Zhejiang Provincial Key Laboratory of Orthopaedics, Wenzhou, China.

Background: Conservative therapy is used for children with odontoid fracture; however, when the odontoid fracture is complicated by significant displacement and unstable, surgery is required. Anterior cervical hollow lag screw fixation has been successfully used in adult patients, but until now, there has not been any relevant image measurement research in children with os odontoideum. The aim of the present study was to identify the morphometric changes of normal os odontoideum in children of different ages and to discuss parameters for screw fixation. Read More

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February 2021

Preoperative "Cervical Axis" Deviation Increases the Risk of Distal Adding-On Following Surgery in Lenke 1 and 2 Adolescent Idiopathic Scoliosis Patients.

Global Spine J 2021 Mar 11:2192568221998642. Epub 2021 Mar 11.

Department of Orthopaedic Surgery (NOCERAL), Faculty of Medicine, 37447University of Malaya, Kuala Lumpur, Malaysia.

Study Design: Retrospective.

Purpose: To evaluate the relationship between shoulder/ neck imbalance with distal adding-on phenomenon and to identify other risk factors in Lenke 1 and 2 (non-AR curves) adolescent idiopathic scoliosis (AIS) patients.

Methods: 100 Lenke 1 and 2 AIS patients with lowest instrumented vertebra (LIV) cephalad to or at L1 were recruited. Read More

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Anterior odontoid screw fixation extrusion as reason for oesophagus perforation.

Neurol Neurochir Pol 2021 9;55(2):227-229. Epub 2021 Mar 9.

Neurosurgery Department, St Lukas Hospital, Lwowska 178a, 33-100 TARNOW, Poland.

Background: Type II odontoid fractures are mostly encountered in the elderly. Due to a high risk of non-union fractures in the case of conservative treatment, surgical fixation is widely recommended. Anterior odontoid screw fixation (AOSF) is a method that allows for a wide range of cervical mobility, and it is a relatively safe procedure that is recommended as the method of choice, although rare complications can be fatal when it leads to life-threatening oesophageal perforation. Read More

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Surgical outcomes of posterior occipito-cervical decompression and fusion for basilar invagination: A prospective study.

J Clin Orthop Trauma 2021 Feb 27;13:127-133. Epub 2020 Nov 27.

Department of Orthopedics, B. J. Medical College, Civil Hospital, Asarwa, Ahmedabad, Gujarat, 380016, India.

Study Design: A Prospective Study.

Objective: To assess results of posterior occipito-cervical decompression and fusion operated with intra-operative traction/manipulation and instrumented reduction in cases of Basilar Invagination(BI).

Methods: Total 22 patients of 8-65 years with diagnosed BI were operated for posterior occipito-cervical fusion by intra-operative traction/manipulation and instrumented reduction. Read More

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February 2021

[Clinicopathological features of notochordal tumors: a study of 48 cases].

Zhonghua Bing Li Xue Za Zhi 2021 Mar;50(3):201-206

Department of Pathology, Shanghai Sixth People's Hospital, Affiliated to Shanghai Jiaotong University, Shanghai 200233, China.

To investigate the clinicopathological features, diagnosis and differential diagnosis of notochordal tumors. The clinical, radiologic and pathologic data of 48 notochordal tumors were collected from 2008 to 2019 at Shanghai Jiaotong University Sixth People's Hospital. Expression of cytokertin, S-100 protein, vimentin, brachyury and INI1 was detected by immunohistochemistry. Read More

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Transoral approach using a tubular retractor system in the treatment of atlantoaxial Pott's disease: a novel method of surgical decompression.

BMJ Case Rep 2021 Mar 2;14(3). Epub 2021 Mar 2.

Department of Orthopedics, Philippine General Hospital, Section of Spine Surgery, University of the Philippines Manila, Manila, Metro Manila, Philippines.

The use of tubular retractors in minimally invasive spine surgery has been described extensively in the literature. However, there are only select reports discussing their use specifically in a transoral approach for upper cervical pathologies such as an epidural abscess and a dystrophic os odontoideum.We report the first use of a transtubular transoral approach in a rare case of an adult presenting with severe neck pain with progressing neurologic signs secondary to atlantoaxial Pott's disease. Read More

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Posterior Circulation Stroke due to Atlantoaxial Instability in CHST3-Related Skeletal Dysplasia: A Case Report.

JBJS Case Connect 2021 02 24;11(1). Epub 2021 Feb 24.

Department of Radiology, Sir H.N. Reliance Foundation Hospital, Mumbai, Maharashtra, India.

Case: An eight-year-old boy presented with acute encephalopathy due to posterior circulation ischemic stroke. He was found to have vertebral artery stenosis secondary to atlantoaxial instability (AAI) due to an os odontoideum. Occipitocervical fusion was performed 4 weeks after stroke. Read More

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February 2021

Fractures of C2 (Axis) Vertebra: Clinical Presentation and Management.

Int J Spine Surg 2020 Dec 29;14(6):908-915. Epub 2020 Dec 29.

Department of Neurosurgery, Mansoura Faculty of Medicine, Mansoura University, Egypt, and Prince Mohammed Bin Abdulaziz Hospital, Riyadh, Kingdom of Saudi Arabia.

Background: Injuries of the upper cervical spine are a major cause of morbidity and mortality due to associated spinal cord and head injuries. The injury patterns of the upper cervical spine are numerous, and the neurologic sequelae are diverse. The axis (C2) is the most commonly fractured vertebra in the upper cervical spine; its unique anatomy and architecture pose difficulties in the diagnosis and the management of its fractures. Read More

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December 2020

[. Presentation in adult age].

Acta Ortop Mex 2020 Jul-Aug;34(4):234-237

División de Cirugía de Columna, Instituto Nacional de Rehabilitación «Dr. Luis Guillermo Ibarra Ibarra». Av. México-Xochimilco 289, C.P. 14389. Ciudad de México. México.

The is a variable oval or round ossicle with a smooth cortical border, which partially corresponds to the odontoid process, without having continuity with the rest of C2 bone. The multifactorial etiology causes instability and clinically translates into pain and compression data into neural structures. The treatment of choice is surgical and techniques have been developed that focus on preserving the stability of the segment. Read More

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February 2021

A new tool in percutaneous anterior odontoid screw fixation.

BMC Musculoskelet Disord 2021 Jan 18;22(1):87. Epub 2021 Jan 18.

Department of Orthopedic Surgery, The 80th Army Hospital of PLA, No. 256 Beigongxi Street, Weicheng District, Weifang, Shandong, China.

Background: Percutaneous anterior odontoid screw fixation for odontoid fractures remains challenging due to the complex anatomy of the craniocervical junction. We designed a new guide instrument to help with the placement of guide wire, which have achieved satisfying surgical results. The objective of this study is to evaluate the safety and efficacy of this new tool in percutaneous anterior odontoid screw fixation. Read More

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January 2021

4-Point C2 Fixation for Occipitocervical Fusion: Technical Case Report.

World Neurosurg 2021 Apr 7;148:38-43. Epub 2021 Jan 7.

Department of Surgery, Maimonides Medical Center, Brooklyn, New York, USA.

Background: Occipitocervical fusion is an important surgical procedure to treat instability of the upper cervical and craniocervical junction. Fixation to the dense cortical bone of the occiput, contemporaneously typically accomplished with a plate and screws, is known to be strong and durable, but there are many competing methods used to secure an adequate number of fixation points of sufficient strength at the cervical end. Extension of hardware to the midcervical region to acquire additional fixation points, however, results in loss of subaxial motion segments and additional potential morbidity. Read More

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Cranio-Vertebral Junction Triangular Area: Quantification of Brain Stem Compression by Magnetic Resonance Images.

Brain Sci 2021 Jan 6;11(1). Epub 2021 Jan 6.

Department of Neurosurgery, Neurological Institute, Taipei Veterans General Hospital, Taipei 11217, Taiwan.

(1) Background: Most of the currently used radiological criteria for craniovertebral junction (CVJ) were developed prior to the popularity of magnetic resonance images (MRIs). This study aimed to evaluate the efficacy of a novel triangular area (TA) calculated on MRIs for pathologies at the CVJ. (2) Methods: A total of 702 consecutive patients were enrolled, grouped into three: (a) Those with pathologies at the CVJ ( = 129); (b) those with underlying rheumatoid arthritis (RA) but no CVJ abnormalities ( = 279); and (3) normal (control; = 294). Read More

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January 2021

Three-Dimensional Assessment of Cervical Vertebrae Anomalies in Patients With Cleft Lip and Palate.

Cleft Palate Craniofac J 2020 Dec 21:1055665620980226. Epub 2020 Dec 21.

Department of Integrative Biomedical and Diagnostic Sciences, School of Dentistry, 6684Oregon Health and Science University. Portland, OR, USA.

Objective: To evaluate the occurrence of cervical vertebrae anomalies (CVA) in patients with unilateral (UCLP) and bilateral cleft lip and palate (BCLP) using cone beam computed tomography (CBCT) examinations.

Design: Retrospective assessment of CBCT images. Descriptive statistics were calculated. Read More

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December 2020

Single door laminoplasty plus posterior fusion for posterior atlantoaxial dislocation with congenital malformation: A case report and review of literature.

World J Clin Cases 2020 Dec;8(23):6136-6143

Department of Orthopaedic Surgery, The First Affiliated Hospital of Soochow University, Suzhou 215000, Jiangsu Province, China.

Background: Posterior atlantoaxial dislocation (PAD) is a rare type of upper cervical spine disease. We sought to describe a unreported case of old PAD with os odontoideum (OO) and atlas hypoplasia (AH) and our unique treatment approach consisting of C1 single door laminoplasty with C1-3 posterior fixation and fusion.

Case Summary: A 70-year-old male patient who suffered from progressive aggravating numbness and limb weakness for 4 years without trauma, was diagnosed with old PAD with OO and AH. Read More

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December 2020

Feasibility of Double Anterior Odontoid Screw: A CT-Based Morphometric Analysis of the Axis in Adult Indian Population.

Neurol India 2020 Nov-Dec;68(6):1361-1366

Department of Neurosurgery, All India Institute of Medical Sciences, New Delhi, India.

Background: The fractures of the odontoid process constitute 10% of all cervical spine injuries. Odontoid screw placement, although technically challenging, in indicated cases is the ideal treatment. Hence, a thorough knowledge of the odontoid dimensions is necessary prior to the surgical endeavor, more so for planning double odontoid screws. Read More

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December 2020

Results of Conservative and Surgical Management in Children with Idiopathic and Nonidiopathic Os Odontoideum.

World Neurosurg 2021 Mar 15;147:e324-e333. Epub 2020 Dec 15.

Department of Orthopaedics and Traumatology, University of Helsinki, Helsinki, Finland.

Objective: The outcomes of conservative and operative treatment of os odontoideum in children remain unclear. Our objective was to study the outcomes of conservative and surgical treatment of idiopathic os odontoideum in children and compare these outcomes in age- and treatment-matched nonidiopathic children with os odontoideum.

Methods: A retrospective multicenter review identified 102 children with os odontoideum, of whom 44 were idiopathic with minimum 2-year follow-up. Read More

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A Comparison of Three Different Positioning Techniques on Surgical Corrections and Postoperative Alignment in Cervical Spinal Deformity (CD) Surgery.

Spine (Phila Pa 1976) 2021 May;46(9):567-570

Department of Orthopaedic Surgery, Hospital for Special Surgery, New York, NY.

Study Design: Retrospective review of a prospective multicenter cervical deformity database.

Objective: To examine the differences in sagittal alignment correction between three positioning methods in cervical spinal deformity surgery (CD).

Summary Of Background Data: Surgical correction for CD is technically demanding and various techniques are utilized to achieve sagittal alignment objectives. Read More

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Atlantoaxial dislocation with congenital "sandwich fusion" in the craniovertebral junction: a retrospective case series of 70 patients.

BMC Musculoskelet Disord 2020 Dec 7;21(1):821. Epub 2020 Dec 7.

Department of Orthopaedics, Peking University Third Hospital, No 49 North Garden Street, HaiDian District, Beijing, 100191, People's Republic of China.

Background: In the setting of congenital C1 occipitalization and C2-3 fusion, significant strain is placed on the atlantoaxial joint. Vertebral fusion both above and below the atlantoaxial joint (i.e. Read More

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December 2020

Cervical Myeloradiculopathy and Atlantoaxial Instability in Cervical Dystonia.

World Neurosurg 2021 Feb 4;146:e1287-e1292. Epub 2020 Dec 4.

Department of Neurology, National Institute of Mental Health and Neurosciences, Bengaluru, India. Electronic address:

Objective: Atlantoaxial instability, although rarely reported in the literature, can be associated with cervical dystonia (CD) and may lead to compression of the cord at the craniovertebral junction. We present a case series of 4 patients of longstanding CD with neurologic complications. Treatment strategies and challenges are discussed. Read More

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February 2021

Two-Stage Approach for Unstable Pediatric Craniocervical Junction Anomalies with a Halo Vest and Delayed Occipitocervical Fusion: Technical Note, Case Series, and Literature Review.

World Neurosurg 2021 Feb 20;146:e1021-e1030. Epub 2020 Nov 20.

Neurosurgery Service, Virgen del Rocío University Hospital, Seville, Spain; Group of Applied Neuroscience, Biomedicine Institute of Seville, Seville, Spain; Group of Advanced Neurology, Seville, Spain.

Objective: Malformations in the craniocervical junction (CCJ) are rare in the pediatric population but often need surgical treatment. We present a pediatric case series of patients treated with a 2-stage surgical approach with a halo vest and occipitocervical fusion and review complications and outcomes.

Methods: A retrospective analysis of a single-center case series was performed. Read More

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February 2021

A Technique for the In Vivo Study of Three-dimensional Cervical Segmental Motion Characteristics After Anterior Screw Fixation for Odontoid Process Fractures.

Spine (Phila Pa 1976) 2021 Apr;46(7):E433-E442

Department of Orthopedics, the First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, PR China.

Study Design: Kinematics of the cervical spine was investigated using cone beam computed tomography (CBCT) images combined with three dimensions to three dimensions (3D-3D) registration technology in patients after anterior odontoid screw fixation (AOSF) surgery.

Objective: The aim of this study was to investigate in vivo 3D cervical motion characteristics of patients who had undergone AOSF surgeries.

Summary Of Background Data: AOSF surgery is a classic surgical method for the treatment of odontoid fracture, but there are few studies that investigated its effect on in vivo biomechanics of the cervical spine. Read More

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