Morphometric parameters of the odontoid process of C2 vertebrae, in Indian population, a CT evaluation.

BACKGROUND: Osteosynthesis of odontoid fractures, especially for type II odontoid fractures, is often achieved by the placement of screws. Here, utilizing CT, we evaluated the normal anatomy of the odontoid process in an Indian population to determine whether one or two screws could be anatomically accommodated to achieve fixation. METHODS: CT-based morphometric parameters of the odontoid process were assessed in 200 normal Indian patients (2018-2020). RESULTS: Of 200 patients, 127 were male, and 73 were female. The mean minimum external transverse diameter (METD) was 8.80 mm (range 6.1-11.9 mm). Six (3%) patients had a minimum internal transverse diameter (TD) of >8.0 mm that would allow for the insertion of two 3.5-mm cortical screws without tapping, while 10 (5%) patients had TDs of <7.4 mm; none had diameters of <5.5 mm. The mean length of the implant was 36.45 mm in females and 36.89 mm in males, and the mean angle of screw insertion was 60.34° in females and 60.53° in males. CONCLUSION: About two-thirds (59%) of the 200 subjects in our study had a METD of <9 mm, indicating the impracticality for introducing second screws for odontoid fixation.

Single and Multiple Level One Stage Posterior Hemivertebrectomy and Short Segment Fixation: Experience with 22 Cases and Comparison of Single vs. Multilevel Procedures with Minimum 2-Year Follow-Up.

STUDY DESIGN: Data of 22 patients with congenital scoliosis who underwent single stage posterior hemivertebrectomies and short segment fixation with a minimum follow-up of 2 years in our centre were studied retrospectively. PURPOSE: To report the efficacy of posterior hemivertebrectomy in single vs multiple level hemivertebra and compare their results. OVERVIEW OF LITERATURE: Single stage hemivertebrectomy is a standard procedure for single level hemivertebra. Results of multiple level hemivertebrectomies have not been reported. METHODS: Twenty-two patients (9 male and 13 female) with the mean age of 11.2 years (range, 2 years 4 months to 24 years 10 months) and a mean follow up of 32 months (range, 4 to 73 months) were studied retrospectively and their results were compared. RESULTS: Average number of hemivertebrae removed was 1.46 (range, 1 to 3). Mean preoperative and postoperative coronal cob angle was 48.7° (range, 22° to 80°) and 24.2° (range, 7° to 41°), respectively (p<0.001). Mean preoperative and postoperative sagittal cobb angle was 32.1° (range, 7° to 76°) and 13.6° (range, 0° to 23°), respectively (p<0.005). Mean coronal and sagittal cob correction percentage achieved was 50.2% and 51.8% respectively. Mean follow-up was 49 months (range, 30 to 84 months). Mean loss of coronal and sagittal correction at final follow-up was 4% (0% to 13.6%) degrees and 3.5% (0% to 20%), respectively. CONCLUSIONS: Posterior hemivertebrectomy in congenital scoliosis is a safe treatment option for up to 3-level hemivertebrae. Excision of thoracolumbar hemivertebrae results in better correction than thoracic and lumbar hemivertebrae.

Postoperative discitis following single-level lumbar discectomy: Our experience of 17 cases.

BACKGROUND: The established protocols of treatment of postoperative lumbar discitis have not been validated till date. We report a retrospective analysis of a series of patients with discitis following single level lumbar discectomy. We analyzed the outcome of conservative treatment of postoperative discitis with the objective to define when and what surgery was required when the conservative treatment failed. MATERIALS AND METHODS: A total of 17 cases of postoperative discitis treated from 2002 to 2009 were followed up and evaluated clinically, radiologically and by laboratory investigations. All the patients were treated initially conservatively with rest and antibiotic therapy after diagnosis and those who did not respond to conservative treatment of at least 4 weeks were treated surgically. The cases were followed up with serial C-reactive protein (CRP), erythrocyte sedimentation rate (ESR), X-ray, computed tomography (CT) scan and magnetic resonance imaging (MRI) for at least 1 year. RESULTS: The mean followup was 40.38 months (range 12-86 months). Four cases failed to respond to conservative therapy and were treated surgically. In three of these four cases, open debridement, transpedicular fixation and posterolateral fusion was performed, and in the fourth case percutaneous transpedicular fixation was done. In the former group, one case was diagnosed to be tubercular, in another case Staphylococcus aureus was cultured where as the third case culture was sterile. All operated patients showed evidence of interbody fusion at 1 year followup. CONCLUSIONS: Early detection and aggressive treatment are paramount in managing postoperative discitis and the majority do well with conservative treatment. Surgical management in the form of transpedicular fixation and debridement, when required, gives excellent results.

Delayed presentation of cervical facet dislocations.

PURPOSE: To review treatment outcomes of 19 patients with delayed presentation of cervical facet dislocations. METHODS: Records of 17 men and 2 women aged 21 to 63 (mean, 39) years who presented with unilateral (n=14) or bilateral (n=5) cervical facet dislocation after a delay of 7 to 21 (mean, 14) days were reviewed. The most common level of dislocation was C5-C6 (n=9), followed by C4-C5 (n=6), C3- C4 (n=2), and C6-C7 (n=2). The neurological status was graded according to the Frankel classification. One patient (with bilateral facet dislocation) had complete quadriplegia (grade A), 11 had incomplete spinal cord injury (grades C and D), and 7 had nerve root injury. Closed reduction using continuous skull traction for 2 days was attempted. In patients achieving closed reduction, only anterior discectomy and fusion was performed. Those who failed closed reduction underwent posterior partial/complete facetectomy and fixation. If there was traumatic disk prolapse, anterior decompression and fusion was then performed. RESULTS: The mean follow-up was 46 (range, 12- 108) months. 10 of 14 patients with unilateral facet dislocation were reduced with traction and then underwent anterior discectomy and fusion. The remaining 4 patients who failed closed reduction underwent posterior facetectomy and fixation; 3 of them had traumatic disk prolapse and thus also underwent anterior discectomy and fusion with cage and plate. Four of the 5 patients with bilateral facet dislocations failed closed reduction and underwent posterior facetectomy and lateral mass fixation, as well as anterior surgery. The remaining patient achieved reduction after traction and hence underwent only anterior discectomy and fusion. All patients achieved pain relief and sufficient neck movement for normal activities. All 7 patients with nerve root injury improved completely; 9 of the 11 patients with incomplete spinal cord injury improved by one Frankel grade, and the remaining 2 by 2 grades. The patient with complete quadriplegia showed no improvement. CONCLUSION: Preoperative traction is a safe and effective initial treatment for neglected cervical facet dislocation, as it reduces the need for extensive (anterior and posterior) surgery. If closed reduction is successful, anterior discectomy and fusion is the surgery of choice. If not, posterior facetectomy and fusion followed by anterior surgery is preferred.