Traumatic transverse atlantal ligamentous injury with posterior atlantoaxial instability in os odontoideum: Magnetic resonance features

1998 ◽  
Vol 5 (6) ◽  
pp. 442-445
Author(s):  
Peter Dross ◽  
Azam Rizvi
Keyword(s):  
Magnetic Resonance ◽  
Atlantoaxial Instability ◽  
Os Odontoideum ◽  
Ligamentous Injury

Os Odontoideum with Posterior Atlantoaxial Instability

Spine ◽  
1991 ◽  
Vol 16 (7) ◽  
pp. 706-715 ◽  
Author(s):  
NOBUKI SHIRASAKI ◽  
KOZO OKADA ◽  
SHIRO OKA ◽  
NOBORU HOSONO ◽  
KAZUO YONENOBU ◽  
...  
Keyword(s):  
Atlantoaxial Instability ◽  
Os Odontoideum

Use of a titanium mesh cage for posterior atlantoaxial arthrodesis

2002 ◽  
Vol 96 (1) ◽  
pp. 127-130 ◽  
Author(s):  
Morio Matsumoto ◽  
Kazuhiro Chiba ◽  
Takashi Tsuji ◽  
Hirofumi Maruiwa ◽  
Yoshiaki Toyama ◽  
...  
Keyword(s):  
Donor Site ◽  
Atlantoaxial Instability ◽  
Os Odontoideum ◽  
Posterior Arch ◽  
Rigid Fixation ◽  
Titanium Mesh ◽  
Content Type ◽  
Atlantoaxial Fixation ◽  
Mesh Cage ◽  
Atlantoaxial Arthrodesis

✓ The authors placed titanium mesh cages to achieve posterior atlantoaxial fixation in five patients with atlantoaxial instability caused by rheumatoid arthritis or os odontoideum. A mesh cage packed with autologous cancellous bone was placed between the C-1 posterior arch and the C-2 lamina and was tightly connected with titanium wires. Combined with the use of transarticular screws, this procedure provided very rigid fixation. Solid fusion was achieved in all patients without major complications. The advantages of this method include more stable fixation, better control of the atlantoaxial fixation angle, and reduced donor-site morbidity compared with a conventional atlantoaxial arthrodesis in which an autologous iliac crest graft is used.

Anatomical suitability of C1–2 transarticular screw placement in pediatric patients

2000 ◽  
Vol 92 (1) ◽  
pp. 7-11 ◽  
Author(s):  
Douglas L. Brockmeyer ◽  
Julie E. York ◽  
Ronald I. Apfelbaum
Keyword(s):  
Pediatric Patients ◽  
Screw Fixation ◽  
Vascular Complications ◽  
Screw Placement ◽  
Atlantoaxial Instability ◽  
Os Odontoideum ◽  
Transarticular Screw ◽  
Content Type ◽  
Transarticular Screw Fixation ◽  
Fine Print

Object. Craniovertebral instability is a challenging problem in pediatric spinal surgery. Recently, C1–2 transarticular screw fixation has been used to assist in craniovertebral joint stabilization in pediatric patients. Currently there are no available data that define the anatomical suitability of this technique in the pediatric population. The authors report their experience in treating 31 pediatric patients with craniovertebral instability by using C1–2 transarticular screws. Methods. From March 1992 to October 1998, 31 patients who were 16 years of age or younger with atlantooccipital or atlantoaxial instability, or both, were evaluated at our institution. There were 21 boys and 10 girls. Their ages ranged from 4 to 16 years (mean age 10.2 years). The most common causes of instability were os odontoideum (12 patients) and ligamentous laxity (eight patients). Six patients had undergone a total of nine previous attempts at posterior fusion while at outside institutions. All patients underwent extensive preoperative radiological evaluation including fine-slice (1-mm) computerized tomography scanning with multiplanar reconstruction to evaluate the anatomy of the C1–2 joint space. Preoperatively, of the 62 possible C1–2 joint spaces in 31 patients, 55 sides (89%) were considered suitable for transarticular screw placement. In three patients the anatomy was considered unsuitable for bilateral screw placement. In three patients the anatomy was considered inadequate on one side. Fifty-five C1–2 transarticular screws were subsequently placed, and there were no neurological or vascular complications. Conclusions. The authors conclude that C1–2 transarticular screw fixation is technically possible in a large proportion of pediatric patients with craniovertebral instability.

Magnetic resonance imaging of ligamentous injury of the cervical spine

1996 ◽  
Vol 3 (1) ◽  
pp. 9-15 ◽  
Author(s):  
Jean Warner ◽  
K. Shanmuganathan ◽  
Stuart E. Mirvis ◽  
Donald Cerva
Keyword(s):  
Magnetic Resonance Imaging ◽  
Cervical Spine ◽  
Magnetic Resonance ◽  
Resonance Imaging ◽  
Ligamentous Injury

scholarly journals Retroodontoid Pseudotumor Related to Development of Myelopathy Secondary to Atlantoaxial Instability on Os Odontoideum

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
M. Hamard ◽  
S. P. Martin ◽  
S. Boudabbous
Keyword(s):  
Atlantoaxial Instability ◽  
Os Odontoideum ◽  
Cervical Cord ◽  
Unknown Etiology ◽  
Complete Disappearance ◽  
Pathophysiological Mechanism ◽  
Tissue Mass ◽  
Inflammatory Conditions ◽  
Occipitocervical Fixation ◽  
Compressive Myelopathy

Retroodontoid pseudotumor (ROP) is a nonneoplasic lesion of unknown etiology, commonly associated with inflammatory conditions, and the term of pannus is usually used. Less frequently, ROP formation can develop with other noninflammatory entities, with atlantoaxial instability as most accepted pathophysiological mechanism for posttraumatic or degenerative ROP. As it can clinically and radiologically mimic a malignant tumor, it is paramount for the radiologist to know this entity. Magnetic resonance imaging is the modality of choice to reveal the possible severe complication of ROP in the form of a compressive myelopathy of the upper cervical cord. The purpose of the surgical treatment is the regression or complete disappearance of ROP, with posterior decompression by laminectomy and posterior C1-C2 or occipitocervical fixation. We present the case of an elderly patient with retroodontoid soft tissue mass secondary to a chronic atlantoaxial instability on os odontoideum, an extremely rare cause of ROP. The patient developed a posttraumatic cervical myelopathy related to the decompensation of this C1-C2 instability responsible for the formation of a compressive ROP. We will overview the retroodontoid pseudotumor and its differential diagnosis.

Arthroscopic correlation of ligamentous injury in adult knee with magnetic resonance imaging

2020 ◽  
Vol 3 (3) ◽  
pp. 109
Author(s):  
Shubhda Sagar ◽  
RahulKumar Gupta ◽  
Arunim Swarup ◽  
AbhayShankar Dube ◽  
Avinash Kumar ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Resonance Imaging ◽  
Ligamentous Injury

Dystopic Os Odontoideum: A Rare Cause of Atlantoaxial Instability

2017 ◽  
Vol 4 (1) ◽  
pp. 38-39
Author(s):  
K Krishnakumar ◽  
Suresh Nair ◽  
Joe M Das
Keyword(s):  
Atlantoaxial Instability ◽  
Os Odontoideum
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