How to Use This Tool

Getting Started

This interactive tool helps you perform precise lumbar spine measurements on lateral X-rays. Import your patient's X-ray image, select measurement tools from the floating panel, and place reference points to calculate key biomechanical parameters.

Measurement Workflow

• Import X-ray: Click "Choose X-ray Image" to load a lateral lumbar X-ray. Adjust image opacity using the slider.
• Open Tools Panel: Click the "📐 Tools" button on the X-ray to reveal measurement tools. Click "Hide" to collapse.
• Select Tool: Click one of the measurement buttons. The active tool will be highlighted in green.
• Place Points: Click on the X-ray image to place measurement points.
• View Results: Click "📊 Results" to view measurements with color-coded indicators.
• Pan Image: Click "🔄 Pan" to reveal navigation arrows for repositioning the X-ray.

Measurement Tools Explained

• L1-L5 Lordosis (Cobb): Measures lumbar lordotic curve. 4 points. Normal: 40-60°.
• Ferguson's Angle: Measures lumbosacral angle. 3 points. Normal: 30-45°.
• Sacral Base Angle: Sacral inclination relative to horizontal. 4 points. Normal: 30-45°.
• L5-S1 Disc Angle: Lumbosacral disc space angle. 2 points. Normal: 10-20°.
• Lumbar Disc Heights: Click on endplates of each disc space. Normal: 7-12mm.
• Lumbar Gravity Line: Vertical plumb line. Should pass through anterior 1/3 of sacral base.
• George's Line: Posterior vertebral body alignment. Smooth curve = normal.
• Pelvic Tilt Angle: Pelvic rotation. 4 points. Normal: 10-20°.

📚 Measurement References

Peer-reviewed sources for measurement methods and normal values: