Choll W. Kim

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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)
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)
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)
BACKGROUND There is an inherently difficult learning curve associated with minimally invasive surgical (MIS) approaches to spinal decompression and fusion. The association between complication rate and the learning curve remains unclear. QUESTIONS/PURPOSES We performed a systematic review for articles that evaluated the learning curves of MIS procedures(More)
The skeleton of sea urchin spines is composed of large single crystals of Mg-rich calcite, which have smooth, continuously curved surfaces and form a three-dimensional fenestrated mineral network. Spines of the echinoids Heterocentrotus trigonarius and Heterocentrotus mammillatus were converted by the hydrothermal reaction at 180 degrees C to bioresorbable(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)
STUDY DESIGN Controlled laboratory and cross-sectional study designs. OBJECTIVE To determine psoas major (PM) muscle architectural properties, in vivo sarcomere-length operating range, and passive mechanical properties. SUMMARY OF BACKGROUND DATA PM is an important hip flexor but its role in lumbar spine function is not fully understood. Several(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)
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)