Stress distribution of lumbar spine under compression.

The Influence of Muscle Forces on the Stress Distribution in the Lumbar Spine

Introduction: Previous studies of bone stresses in the human lumbar spine have relied on simplified models when modeling the spinal musculature, even though muscle forces are likely major contributors to the stresses in the vertebral bones. Detailed musculoskeletal spine models have recently become available and show good correlation with experimental findings. A combined inverse dynamics and f...

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Lumbar spine densitometry.

failure of antigen production is more likely to be due to genetic change associated with incomplete penetrance than to genetic loss. An alternative or additional possibility cannot, however, be excluded-that exuberant cell division causes dilution of a particulate cytoplasmic factor responsible for the formation of the antigen. Loss of organ-specific antigens could influence tumour metastasis b...

Syphilis of the lumbar spine

RATIONALE Tertiary syphilis can manifest as gummatous disease, but gumma of the spine has been extremely rarely reported. PATIENT CONCERNS A 61-year-old male complained of worsening pain and numbness in both lower legs for four weeks. DIAGNOSES Syphilis of the Lumbar Spine. INTERVENTIONS Pedicle screw fixation (L3-S1) and posterior decompression of the vertebral canal at L4-5 were perform...

Beam Collimation during Lumbar Spine Radiography: A Retrospective Study

Introduction: Collimating the primary beam to the area of diagnostic interest (ADI) has been strongly recommended as an effective method to reduce patient’s radiation dose and to improve image quality during radiology practice. Lack or inadequate collimation results in excessive radiation dose to patients and deterioration image quality.Objective: To assess the quality of beam collimation dur...