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Correlation between vertebral body rotation and two-dimensional vertebral bone density measurement
F P Girardi1, H K Parvataneni, H S Sandhu
1SpineCare Institute, Hospital for Special Surgery, New York, NY 10021, USA. girardif@hss.edu
Summary
Spinal rotation in idiopathic scoliosis significantly affects bone mineral density measurements. Increased rotation can decrease apparent bone density by up to 20%, impacting diagnostic accuracy in scoliotic patients.
Area of Science:
- Orthopedics
- Radiology
- Bone Densitometry
Background:
- Idiopathic scoliosis involves vertebral rotation, which may affect bone density measurements.
- Accurate bone mineral density (BMD) assessment is crucial for diagnosing osteoporosis and monitoring bone health.
Purpose of the Study:
- To investigate the impact of vertebral rotation on lumbar spine bone mineral density determination.
- To quantify the potential measurement changes in BMD due to spinal deformity.
Main Methods:
- A human cadaveric lumbar spine (L1-L4) was used.
- Bone mineral content, vertebral segment area, and BMD were measured at neutral and rotated positions (0-60 degrees in 10-degree increments).
- Two BMD readings were taken at each rotation interval.
Main Results:
- Vertebral segment area increased with rotation up to 50 degrees, then decreased.
- BMD showed a significant negative correlation with the degree of rotation (r = -0.92, p<0.001).
- A nearly 20% decrease in measured BMD was observed with 60 degrees of rotation.
Conclusions:
- Spinal rotation significantly influences apparent bone mineral density by altering the measured vertebral segment area.
- The observed BMD changes, potentially up to 20%, must be considered in the assessment of scoliotic patients.
- This finding highlights the importance of accounting for spinal deformity in BMD interpretation.