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STUDY DESIGN A morphometric analysis, using magnetic resonance imaging (MRI) studies of the lumbar spine. OBJECTIVE To identify the anatomic position of the ventral root and the retroperitoneal vessels in relation to the vertebral body in normally aligned and deformed spines. SUMMARY OF BACKGROUND DATA The lateral approach to the lumbar spine is a(More)
STUDY DESIGN Cadaveric biomechanical study and retrospective chart review. OBJECTIVE Biomechanical comparison of segmental versus nonsegmental fixation of lumbar burst fractures and clinical analysis of short-term radiographic outcomes. SUMMARY OF BACKGROUND DATA Traditional short nonsegmental posterior fixation of thoracolumbar burst fractures suffers(More)
Treatment of patients with metastatic disease of the spine continues to be a challenging problem. Advances in imaging studies and surgical techniques have improved patient outcomes with operative intervention. However, the lack of a validated set of criteria to determine spinal instability makes patient selection for surgical intervention difficult.(More)
RATIONALE AND OBJECTIVES The optimal advanced imaging method for detection and characterization of posterior tibialis tendon (PTT) tears is unclear. The purpose of this study was to investigate the utility of ultrasonography (US) and MR imaging in the detection of surgically created PTT tears in cadavers. MATERIALS AND METHODS This was a prospective(More)
BACKGROUND CONTEXT Failed back syndrome, a condition that affects 3-14% of postoperative spine patients, is characterized by the recurrence of radicular pain after spinal decompression. The source of this pain in some patients is thought by many investigators to be the result of epidural scarring and nerve root tethering, but this is controversial. We have(More)
Minimally invasive surgery for spinal disorders is predicated on the following basic principles: (1) avoid muscle crush injury by self-retaining retractors; (2) do not disrupt tendon attachment sites of key muscles, particularly the origin of the multifidus muscle at the spinous process; (3) use known anatomic neurovascular and muscle compartment planes;(More)
BACKGROUND CONTEXT Vertebral compression fractures can cause deformity, pain, and disability. Kyphoplasty involves percutaneous insertion of an inflatable balloon tamp into a fractured vertebra followed by injection of polymethylmethacrylate (PMMA) bone cement. PMMA has several disadvantages such as potential thermal necrosis and monomer toxicity. Calcium(More)
STUDY DESIGN Literature review. OBJECTIVE To describe the scientific basis of minimally invasive spine surgery as it relates to posterior lumbar surgery. SUMMARY OF BACKGROUND DATA Minimally invasive spine (MIS) surgery is predicated on several basic principles: (1) avoid muscle crush injury by self-retaining retractors; (2) do not disrupt tendon(More)
The ideal biomaterial for the repair of bone defects is expected to have good mechanical properties, be fabricated easily into a desired shape, support cell attachment, allow controlled release of bioactive factors to induce bone formation, and biodegrade into nontoxic products to permit natural bone formation and remodeling. The synthetic polymer(More)
UNLABELLED Fungal infections of the spine are relatively uncommon. Fungi such as Coccidioides immitis and Blastomyces dermatitidis are limited to specific geographical areas whereas cryptococcus, candida, and aspergillus are found worldwide. Candida and aspergillus are normal commensals of the body and produce disease in susceptible organisms when they gain(More)