Publications by authors named "Adam L Shimer"

Cervical facet injuries, though less common than other spinal injuries, represent a subset of subaxial cervical spine injuries and can present significant challenges in terms of diagnosis, management, and outcomes. A major concern with cervical facet fracture is identifying instability patterns that may necessitate surgical stabilization. Particularly in cases of cervical facet fracture dislocations, there remains controversy regarding requirements for closed reduction, timing, surgical approach, need for preoperative MRI, and method of fixation.

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Background: The use of translaminar screws may serve as a viable salvage method for complicated cases. To our understanding, the study of the feasibility of translaminar screw insertion in the actual entire subaxial cervical spine has not been carried out yet. The purpose of this study was to report the feasibility of translaminar screw insertion in the entire subaxial cervical spine.

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Repetitive stress on the lumbosacral spine during sporting activity places the athletic patient at risk of developing symptomatic pars defect. Clinical history, physical examination, and diagnostic imaging are important to distinguish spondylolysis from other causes of lower back pain. Early pars stress reaction can be identified with advanced imaging, before the development of cortical fracture or vertebral slip progression to spondylolisthesis.

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Study Design: Retrospective case series at a single academic medical center.

Objective: The aim was to determine if specific clinical, radiologic, and procedural factors are associated with conversion to surgery after fluoroscopically guided cyst rupture.

Summary Of Background Data: Percutaneous fluoroscopic rupture of facet cysts can often be the definitive treatment; however, it is unknown before the procedure who will ultimately proceed to formal surgical decompression.

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Study Design: A retrospective database analysis among Medicare beneficiaries OBJECTIVE.: The aim of this study was to determine the effect of chronic steroid use and chronic methicillin-resistant Staphylococcus aureus (MRSA) infection on rates of surgical site infection (SSI) and mortality in patients 65 years of age and older who were treated with lumbar spine fusion.

Summary Of Background Data: Systemic immunosuppression and infection focus elsewhere in the body are considered risk factors for SSI.

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Study Design: Anatomic study.

Objectives: To determine the relationship of the anatomical footprint of the C1 pedicle relative to the lateral mass (LM).

Methods: Anatomic measurements were made on fresh frozen human cadaveric C1 specimens: pedicle width/height, LM width/height (minimum/maximum), LM depth, distance between LM's medial aspect and pedicle's medial border, distance between LM's lateral aspect to pedicle's lateral border, distance between pedicle's inferior aspect and LM's inferior border, distance between arch's midline and pedicle's medial border.

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Study Design: Retrospective analysis; single center data.

Objective: The purpose of this study is to look at the utility and relevance of immediate postoperative radiographs in providing vital information leading to immediate revision after spine surgery.

Summary Of Background Data: Immediate postoperative radiographs are routinely obtained in the recovery room after spine surgery to verify the level, alignment of the spine, implant position, and the adequacy of the procedure.

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Study Design: Retrospective review.

Objective: To identify the incidence and analyze the risk of postoperative complications amongst elderly patients with rheumatoid arthritis undergoing anterior cervical fusion.

Summary Of Background Data: Previous studies have reported elevated risks of postoperative complications for patients with rheumatoid arthritis undergoing orthopedic procedures.

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Study Design: Retrospective, economic analysis.

Objective: The aim of this study was to analyze the trend in hospital charge and payment adjusted to corresponding surgeon charge and payment for cervical and lumbar fusions in a Medicare sample population from 2005 to 2014.

Summary Of Background Data: Previous studies have reported trends and variation in hospital charges and payments for spinal fusion, but none have incorporated surgeon data in analysis.

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Study Design: Retrospective database review.

Objective: To understand medical complication rates, readmission rates, costs, and discharge dispositions in anterior lumbar interbody fusion (ALIFs) versus transforaminal lumbar interbody fusions (TLIFs)/posterior lumbar interbody fusions (PLIFs) for lumbar degenerative disease.

Summary Of Background Data: Indications for ALIFs versus PLIFs can vary, though benefits of anterior approach surgery include full access to the anterior column and ability to place fusion devices.

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Study Design: A cadaveric study.

Summary Of Background Data: Translaminar screws were initially developed for C2 fixation. Since then, their usage has expanded to include the subaxial cervical spine, and thoracic and lumbar spine.

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Spinal subdural abscess is a rare central nervous system infection with just over a hundred cases reported. It is much less common than spinal epidural abscess. While most case reports have focused on route of infection and treatment options, there have not been any reports that focused on the unique MRI findings of spinal subdural abscess.

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OBJECTIVE The authors conducted a study to compare neurological deficit rates associated with complex adult spinal deformity (ASD) surgery when recorded in retrospective and prospective studies. Retrospective studies may underreport neurological deficits due to selection, detection, and recall biases. Prospective studies are expensive and more difficult to perform, but they likely provide more accurate estimates of new neurological deficit rates.

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Study Design: Retrospective analysis of a Medicare database (2005 to 2012).

Objective: To study postoperative complication rates following thoracolumbar fusion for traumatic thoracolumbar fracture in patients with ankylosing spondylitis (AS) compared with patients without AS.

Methods: The PearlDiver database (2005 to 2012) was queried to examine postoperative complication rates in patients with AS undergoing posterior thoracolumbar fusion for thoracolumbar fracture (  =  968).

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Study Design: A retrospective database review.

Objective: The aim of this study was to determine the complication and mortality rates in patients 80 years of age and older who were treated with anterior cervical fusion surgery and to compare these rates against those of other elderly patients.

Summary Of Background Data: Cervical spondylosis is frequently observed in the elderly and is the most common cause of myelopathy in older adults.

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Background Context: Although multiple studies have cited that diabetes mellitus as a risk factor decreased functional outcomes, increased infectious complications, and overall increased reoperation rate following degenerative lumbar spinal surgery, few have investigated how perioperative glycemic control influences such complications.

Purpose: The primary goal of the present study was to use a national database to evaluate the association of perioperative glycemic control as demonstrated by hemoglobin A1c (HbA1c) levels in patients with diabetes undergoing primary, single-level decompression without concomitant fusion with the incidence of deep postoperative infection requiring operative irrigation and debridement. Our secondary objective was to calculate a threshold level of HbA1c above which the risk of postoperative infection after lumbar decompression increases significantly in patients with diabetes.

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OBJECTIVE Lumbar epidural steroid injections (LESIs) are performed for both diagnostic and therapeutic purposes for a variety of indications, including low-back pain, the leading cause of disability and expense due to work-related conditions in the US. The steroid agent used in epidural injections is reported to relieve nerve root inflammation, local ischemia, and resultant pain, but the injection may also have an adverse impact on spinal surgery performed thereafter. In particular, the possibility that preoperative epidural injections may increase the risk of surgical site infection after lumbar spinal fusion has been reported but has not been studied in detail.

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Objective: To evaluate the association of perioperative hemoglobin A (HbA) level in patients with diabetes with the incidence of infection after anterior cervical discectomy and fusion requiring operative intervention, in addition to determining if a threshold level of HbA above which the risk of infection increases significantly exists.

Methods: A national administrative database was queried for patients who underwent primary anterior cervical discectomy and fusion with diabetes who had a perioperative HbA level recorded within 3 months of surgery. These patients were stratified based on their HbA level in 0.

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Study Design: A retrospective database analysis.

Objective: The aim of this study was to determine whether any association exists between preoperative cervical epidural steroid injections (CESIs) at various time intervals before anterior cervical discectomy and fusion (ACDF) or posterior cervical fusion (PCF) and the incidence of postoperative infection.

Summary Of Background Data: Although infectious complications following CESI are uncommon, the association between preoperative CESI and postoperative infection following ACDF or PCF has yet to be evaluated in the current literature.

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Study Design: Retrospective database review.

Objective Of The Study: The objective of the study was to assess whether bone morphogenetic protein (BMP) decreases the risk of revision surgery in elderly patients treated with 3-7 level or 8 or greater level fusions.

Summary Of Background Data: Revision spine surgery in the elderly is a complex undertaking, highlighting the importance of discovering methods to decrease the risk of repeat procedures.

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Background: Telephone calls play a significant role in the follow-up care of postoperative patients. However, further data are needed to identify the determinants of patient-initiated telephone calls after surgery because these factors may also highlight potential areas of improvement in patient satisfaction and during the hospital discharge process. Therefore, the goal of this study is to determine the number of postoperative patient telephone calls within 14 days after surgery and establish the factors associated with patient-initiated calls and reasons for calling.

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Study Design: Retrospective database review.

Objective: To assess complication and mortality rates after lumbar spinal fusion surgery in patients with late stage renal disease.

Summary Of Background Data: Lumbar spinal fusion surgeries are common in elderly patients who are well-known to have increased comorbidity burden.

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Study Design: A retrospective database review.

Objective: The aim of this study was to compare the occurrence of complications in patients treated with one to two-level, three to seven-level, and more than eight level fusions.

Summary Of Background Data: Elderly patients constitute a rapidly growing demographic with an increasing need for spinal procedures.

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