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Establishing intercrestal line by posture:--a radiographic evaluation.
Naoki Shiraishi1, George Matsumura
1Department of Anatomy, School of Medicine, Kyorin University, Shinkawa 6-20-2, Mitaka City, Tokyo. nsmd@kyorin-u.ac.jp
Okajimas Folia Anatomica Japonica
|March 11, 2006
Summary
Jacoby's line position varies with lumbar spine posture. Flexing the spine to L4-5 spinous processes offers a more reliable landmark for procedures like subarachnoid puncture, especially in elderly patients.
Area of Science:
- Anatomy
- Radiology
- Medical Imaging
Background:
- Jacoby's line is an anatomical landmark used in spinal procedures.
- Its precise location can vary depending on patient positioning and spinal anatomy.
- Accurate landmark identification is crucial for procedural safety and efficacy.
Purpose of the Study:
- To investigate the positional variability of Jacoby's line at different lumbar spine alignments.
- To determine the most reliable position for establishing Jacoby's line for clinical application.
- To assess gender-based differences in Jacoby's line positioning.
Main Methods:
- Radiographic analysis of the lumbar spine in 100 subjects.
- Examination of Jacoby's line position relative to vertebral bodies and spinous processes.
- Comparison of line positions in extension, neutral, and flexion postures.
Main Results:
- Jacoby's line position varied significantly with lumbar spine flexion, extension, and neutral states.
- In flexion, the line consistently aligned with the L4-5 interspinous region, a reliable landmark.
- Positional accuracy using the neutral spine was found to be inconsistent.
Conclusions:
- Conventional methods of establishing Jacoby's line in a neutral spine may be inaccurate.
- Using the L4-5 spinous processes in lumbar flexion is recommended as a more reliable standard.
- This improved landmarking is particularly important for subarachnoid puncture in elderly patients due to spinal degeneration.