Publications by authors named "Amir M Abtahi"

Study Design: Retrospective Cohort.

Objective: Investigate the disparities between octogenarians and non-octogenarians undergoing cervical spine surgery regarding perioperative, and postoperative outcomes.

Summary Of Background Data: As the population ages, the demand for elective cervical spine surgery among older, more active adults increases.

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Article Synopsis
  • The study investigated how smoking affects recovery after elective cervical laminoplasty for degenerative cervical myelopathy.
  • Smokers showed worse neck and arm pain scores before the surgery, but there were no significant differences in postoperative outcomes compared to nonsmokers after 12 months.
  • Overall, smoking did not appear to significantly impact complications, readmissions, or patient satisfaction following the non-fusion surgical procedure.
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Study Design: Retrospective cohort study.

Objective: To identify factors predictive of returning to work within 90 days of laminoplasty for degenerative cervical myelopathy (DCM).

Background: DCM is a debilitating condition resulting from spinal canal stenosis and spinal cord compression.

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Background And Objectives: Open thoracic diskectomy often requires significant bone resection and fusion, whereas an endoscopic thoracic diskectomy offers a less invasive alternative. Therefore, we sought to compare one-level open vs endoscopic thoracic diskectomy regarding (1) perioperative outcomes, (2) neurological recovery, and (3) total cost.

Methods: A single-center, retrospective, cohort study using prospectively collected data of patients undergoing one-level thoracic diskectomy was undertaken from 2018 to 2023.

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Background: Cervical radiculopathy is a spine ailment frequently requiring surgical decompression via anterior cervical discectomy and fusion (ACDF) or posterior foraminotomy/discectomy. While endoscopic posterior foraminotomy/discectomy is gaining popularity, its financial impact remains understudied despite equivalent randomized long-term outcomes to ACDF. In a cohort of patients undergoing ACDF vs endoscopic posterior cervical foraminotomy/discectomy, we sought to compare the total cost of the surgical episode while confirming an equivalent safety profile and perioperative outcomes.

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Introduction: Anterior cervical discectomy and fusion (ACDF) has proven to be a clinically efficient and cost-effective method for treating patients with degenerative cervical spine conditions. New intervertebral implant products are being developed to improve fusion and stability while decreasing complications. This study assesses the effectiveness of Tritanium C (Tri-C) Anterior Cervical Cage (Stryker) in the treatment of degenerative disk disease (DDD) of the cervical spine compared with polyetheretherketone (PEEK) cages.

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Article Synopsis
  • A study was conducted to evaluate the effects of postoperative treatments (targeted systemic therapy and radiotherapy) on patients who had spine surgery for renal cell carcinoma (RCC).
  • The research analyzed various treatment groups and their demographic similarities, focusing on overall survival rates and local recurrence after surgery.
  • Results showed that patients receiving dual therapy had significantly higher 1-year survival rates and longer overall survival compared to those receiving other treatment options.
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Objective: Obtaining timely postoperative radiotherapy (RT) following separation surgery is critical to avoid local recurrence of disease yet can be a challenge due to scheduling conflicts, insurance denials, and travel arrangements. In patients undergoing metastatic spine surgery for spinal cord compression, the authors sought to: 1) report the rate of postoperative RT, 2) describe reasons for patients not receiving postoperative RT, and 3) investigate factors that may predict whether a patient receives postoperative RT.

Methods: A single-center retrospective case series was undertaken of all patients who underwent metastatic spine surgery for extradural disease between January 2010 and January 2021.

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Background: We sought to determine which aspect of the upper instrumented vertebrae (UIV)-tilt angle or screw angle-was more strongly associated with: (1) proximal junctional kyphosis/failure (PJK/F), (2) other mechanical complications and reoperations, and (3) patient-reported outcome measures (PROMs).

Methods: A single-institution, retrospective cohort study was undertaken for patients undergoing adult spinal deformity (ASD) surgery from 2011 to 2017. Only patients with UIV at T7 or below were included.

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Study Design: This is a retrospective cohort study.

Objective: In patients undergoing elective posterior cervical laminectomy and fusion (PCLF) with a minimum of 5-year follow-up, we sought to compare reoperation rates between patients with an upper instrumented vertebra (UIV) of C2 versus C3/4.

Summary Of Background Data: The long-term outcomes of choosing between C2 versus C3/4 as the UIV in PCLF remain unclear.

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Introduction: The impact of radiation on wound healing after metastatic spine surgery remains an active area of research. In patients undergoing metastatic spine surgery, we sought to (1) assess the relationship between preoperative and/or postoperative radiation on wound complications, and (2) evaluate the relationship between the timing of postoperative radiation and wound complications.

Methods: A single-center, retrospective, cohort study of patients undergoing metastatic spine surgery was conducted from 2010 to 2021.

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Article Synopsis
  • * A retrospective analysis of 311 patients who underwent metastatic spinal surgery revealed that those presenting to the ED had more comorbidities, lower preoperative functional status, and longer hospital stays compared to clinic patients.
  • * Findings showed that ED patients had significantly poorer long-term outcomes, including higher rates of local recurrence and shorter overall survival.
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Objective: After lumbar spine surgery, postoperative drain removal often delays discharge. Whether inpatient drain removal reduces the risk of surgical site infection (SSI) or hematoma remains controversial. Therefore, in patients undergoing elective lumbar spine surgery, the authors sought to determine the impact of inpatient versus outpatient drain removal on the following variables: 1) length of hospital stay (LOS), and 2) postoperative complications.

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Objective: In patients undergoing metastatic spine surgery, we sought to 1) report time to postoperative radiation therapy (RT), 2) describe the predictive factors of time to postoperative RT, and 3) determine if earlier postoperative RT is associated with improved local recurrence (LR) and overall survival (OS).

Methods: A single-center retrospective cohort study was undertaken of all patients undergoing spine surgery for extradural metastatic disease and receiving RT within 3 months postoperatively between January 2010 and January 2021. Time to postoperative RT was dichotomized at <1 month versus 1-3 months.

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Study Design: A retrospective cohort study using prospectively collected data.

Objective: The aim of this study was to investigate preoperative differences in racial and socioeconomic factors in patients undergoing laminoplasty (LP) versus laminectomy and fusion (LF) for degenerative cervical myelopathy (DCM).

Summary Of Background Data: DCM is prevalent in the United States, requiring surgical intervention to prevent neurological degeneration.

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Background And Objectives: Optimal iliac screw position in relation to the sciatic notch remains unknown. In 12 cadavers undergoing S2 alar-iliac (S2AI) screw placement, we tested the pullout strength of screws placed in proximity to the sciatic notch (≤5 mm) vs farther away from the sciatic notch (>5 mm).

Methods: A biomechanical, cadaver-based study was performed on 12 cadavers undergoing bilateral S2AI screw insertion.

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Study Design: Retrospective analysis of prospectively collected data.

Objective: To examine the combined influence of preoperative sleep disturbance and depression on 12-month patient-reported outcomes after lumbar spine surgery (LSS).

Summary Of Background Data: Psychological and behavioral factors are considered major risk factors for poor outcomes after LSS.

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After adult spinal deformity (ASD) surgery, patients often require postoperative rehabilitation at an inpatient rehabilitation (IPR) center or a skilled nursing facility (SNF). However, home discharge is often preferred by patients and hsas been shown to decrease costs. In a cohort of patients undergoing ASD surgery, we sought to (1) report the incidence of discharge to home, (2) determine the factors significantly associated with discharge to home in the form of a simple scoring system, and (3) evaluate the impact of discharge disposition on patient-reported outcome measures (PROMs).

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Objective: In a cohort of employed patients undergoing elective cervical spine surgery with an uncomplicated postoperative course, the authors sought to determine the demographic, functional, and occupational characteristics associated with return to work (RTW) following surgery.

Methods: A retrospective cohort study of prospectively collected data was undertaken of patients undergoing elective cervical spine surgery for degenerative disease in the Quality Outcomes Database. Study inclusion criteria were: 1) employed prior to surgery and planned to RTW, 2) no unplanned readmissions, 3) achieved 30% improvement on the Neck Disability Index (NDI), and 4) were satisfied with the surgical outcome at 3 or 12 months postoperatively.

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Introduction: While the natural history of adolescent idiopathic scoliosis (AIS) and adult idiopathic scoliosis (AdIS) is well documented in the literature, the impact of age on postoperative outcomes remains an active area of research. We performed a systematic review and meta-analysis to compare patients undergoing surgery for AIS and AdIS with respect to: (1) postoperative Cobb correction, (2) perioperative variables, and (3) postoperative complications.

Methods: A systematic literature search was performed in accordance with preferred reporting items for systematic reviews and meta-analyses (PRISMA) guidelines.

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Background And Objectives: Although risk factors for unplanned readmission after cervical spine surgery have been widely reported, less is known about how readmission itself affects patient-reported outcome measures (PROMs). Using the Quality Outcomes Database registry of patients undergoing elective cervical spine surgery, we sought to (1) determine the impact of unplanned readmission on PROMs and (2) compare the effect of specific readmission reasons on PROMs.

Methods: An observational study was performed using a multi-institution, retrospective registry for patients undergoing cervical spine surgery.

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Whether a combined anterior-posterior (AP) approach offers additional benefits over the posterior-only (P) approach in adult spinal deformity (ASD) surgery remains unknown. In a cohort of patients undergoing ASD surgery, we compared the combined AP vs. the P-only approach in: (1) preoperative/perioperative variables, (2) radiographic measurements, and (3) postoperative outcomes.

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Objective: In patients undergoing surgery for primary bone tumors of the spine, we sought to compare Bilsky score 0-1 versus 2-3 in: 1) preoperative presentation, 2) perioperative variables, and 3) long-term outcomes.

Methods: A single-center, retrospective cohort study was undertaken of patients undergoing surgery for extradural, primary bone tumors of the spine between January 2010 and January 2021. The primary exposure variable was Bilsky score, dichotomized as 0-1 versus 2-3.

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Article Synopsis
  • Unplanned readmissions after lumbar spine surgery significantly affect patient-reported outcomes (PROs), but detailed insights on this impact are limited.
  • The study analyzed data from 33,447 patients who underwent elective lumbar spine surgery, focusing on 90-day unplanned readmissions and their influence on pain, disability, quality of life, and patient satisfaction after one year.
  • Results showed that 94% of patients had no unplanned readmissions, while 6% did, prompting further examination of readmission reasons and their correlation with long-term PROs.
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Study Design: Retrospective cohort study.

Objectives: In patients undergoing elective anterior cervical discectomy and fusion (ACDF), we sought to determine the impact of screw length on: (1) radiographic pseudarthrosis, (2) pseudarthrosis requiring reoperation, and (3) patient-reported outcome measures (PROMs).

Methods: A single-institution, retrospective cohort study was undertaken from 2010-21.

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