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Conor Dunn, Jeffrey Moore, Nikhil Sahai, Kimona Issa, Michael Faloon, Kumar Sinha, Ki Soo Hwang and Arash Emami

OBJECTIVE

The objective of this study was to compare anterior cervical discectomy and fusion (ACDF) and minimally invasive posterior cervical foraminotomy (MI-PCF) with tubes for the treatment of cervical radiculopathy in terms of the 1) overall revision proportion, 2) index and adjacent level revision rates, and 3) functional outcome scores.

METHODS

The authors retrospectively reviewed the records of consecutive patients who had undergone ACDF or MI-PCF at a single institution between 2009 and 2014. Patients treated for cervical radiculopathy without myelopathy and with a minimum 2-year follow-up were compared according to the procedure performed for their pathology. Primary outcome measures included the overall rate of revision with fusion and overall revision proportion as well as the rate of index and adjacent level revisions per year. Secondarily, self-reported outcome measures—Neck Disability Index (NDI) and visual analog scale (VAS) for arm (VASa) and neck (VASn) pain—at the preoperative and postoperative evaluations were analyzed. Standard binomial and categorical comparative analyses were performed.

RESULTS

Forty-nine consecutive patients were treated with MI-PCF, and 210 consecutive patients were treated with ACDF. The mean follow-up for the MI-PCF cohort was 42.9 ± 6.6 months (mean ± SD) and for the ACDF cohort was 44.9 ± 10.3 months. There was no difference in the overall revision proportion between the two cohorts (4 [8.2%] of 49 MI-PCF vs. 12 [5.7%] of 210 ACDF, p = 0.5137). There was no difference in the revision rate per level per year (3.1 vs. 1.7, respectively, p = 0.464). Moreover, there was no difference in the revision rate per level per year at the index level (1.8 vs. 0.7, respectively, p = 0.4657) or at an adjacent level (1.3 vs. 1.1, p = 0.9056). Neither was there a difference between the cohorts as regards the change from preoperative to final postoperative functional outcome scores (NDI, VASa, VASn).

CONCLUSIONS

Minimally invasive PCF for the treatment of cervical radiculopathy demonstrates rates of revision at the index and adjacent levels similar to those following ACDF. In order to confirm the positive efficacy and cost analysis findings in this study, future studies need to extend the follow-up and show that the rate of revision with fusion does not increase substantially over time.

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Michael Pompliano, Stuart Changoor, Samuel Mease, Cyrus Emami, Kumar Sinha and Ki Soo Hwang

The presence of an omovertebral bone with Sprengel’s deformity and Klippel-Feil syndrome is a complex congenital anomaly that is not well understood. It most commonly manifests as cosmetic deformity, limited range of motion, and functional disability, although there are reports of the insidious development of cervical myelopathy. In this paper, the authors present the case of a 49-year-old man with acute neurological deficits after a low-energy mechanism of traumatic spinal cord compression, resulting from an impinging omovertebral bone through a traumatic laminar defect. The patient underwent resection of the omovertebral bone, laminectomy decompression of the spinal canal, and anterior stabilization. This case highlights a rarely discussed complication of undiagnosed Sprengel’s deformity and its associated conditions following even low-energy traumatic mechanisms.

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Ravi Sharma, Sachin A. Borkar, Manoj Phalak, Sumit Sinha and Ashok K. Mahapatra

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Ashish Goyal, Anil K. Singh, Daljit Singh, Vikas Gupta, Medha Tatke, Sanjiv Sinha and Sushil Kumar

✓ The authors present an unusual case of intramedullary arachnoid cyst diagnosed in a patient after the lesion was resected. A wide decompressive surgery was performed and the lesion removed. Histopathological findings were consistent with the diagnosis of arachnoid cyst. Postoperatively the patient exhibited marked improvement in neurological status. To the best of the authors' knowledge, there is no case report of intramedullary arachnoid cyst reported in the literature. With the advent of newer neuroimaging modalities such as magnetic resonance imaging the number of cases of intramedullary arachnoid cysts encountered in the future may increase.