Hamid Reza Hassanzadeh

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Recently there has been a great research conducted on diverse variations of multi-objective swarm optimization algorithms each of which might have its own strengths and weaknesses. Due to the high complexity of multi-objective problems the efficiency of these methods has become a matter of concern. In this paper a new multi-objective meta-heuristic(More)
Prediction of survival for cancer patients is an open area of research. However, many of these studies focus on datasets with a large number of patients. We present a novel method that is specifically designed to address the challenge of data scarcity, which is often the case for cancer datasets. Our method is able to use unlabeled data to improve(More)
BACKGROUND Widespread use of recombinant human bone morphogenetic protein (rhBMP) in cervical spine surgery has continued despite the U.S. Food and Drug Administration's 2008 notification regarding its adverse effects. Our study goals were to analyze how patient, surgical, and institutional factors influenced rhBMP use in cervical spinal fusion surgery and(More)
This study reports the surgical and clinical outcomes of spinal tumors managed with total en bloc spondylectomy. The authors searched their prospectively maintained database for patients undergoing total en bloc spondylectomy between 2001 and 2013. Ten patients (9 men, 1 woman; average age, 50.7 years; range, 42-68 years) were identified. The authors(More)
STUDY DESIGN Retrospective database review. OBJECTIVE To determine the 90-day complication rate and 90-day and 1-year mortality in patients 80 years of age and older who were treated with posterolateral lumbar spinal fusion surgery and to compare these rates against those of elderly patients ages 65 to 79. SUMMARY OF BACKGROUND DATA Patients over 80(More)
STUDY DESIGN A retrospective database review. OBJECTIVE The aim of this study was to compare complication rates following one to two-level lumbar spine surgery in patients with primary hypercoagulable states and coagulopathies. SUMMARY OF BACKGROUND DATA Both hypercoagulable states and coagulopathies are not uncommon conditions that have the potential(More)
Achieving solid osseous fusion across the lumbosacral junction has historically been, and continues to be, a challenge in spine surgery. Robust pelvic fixation plays an integral role in achieving this goal. The goals of this review are to describe the history of and indications for spinopelvic fixation, examine conventional spinopelvic fixation techniques,(More)
STUDY DESIGN Retrospective review. OBJECTIVES To compare the incidence of proximal junctional kyphosis (PJK) and the clinical, radiographic, and functional outcomes in adults undergoing long posterior spinal fusion with transverse process hooks versus pedicle screws at the uppermost instrumented vertebrae. SUMMARY OF BACKGROUND DATA Proximal junctional(More)
STUDY DESIGN Retrospective review. OBJECTIVE To report and analyze the perioperative complications, radiographical results, and functional outcomes in elderly patients undergoing pedicle subtraction osteotomy (PSO) and/or vertebral column resection (VCR) procedures for spinal deformity correction. SUMMARY OF BACKGROUND DATA To our knowledge, no studies(More)
BACKGROUND Few studies have examined the postsurgical functional outcomes of adults with spinal deformities, and even fewer have focused on the functional results and complications among older adults who have undergone primary or revision surgery for spinal deformity. Our goal was to compare patient characteristics, surgical characteristics, duration of(More)