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[The lumbar spine in profile after Harrington's operation. Apropos of 100 cases]
Insights
Harrington
Area of Science:
- Spine surgery
- Orthopedic research
- Biomechanical analysis
Background:
- Harrington's procedure is a spinal fusion technique.
- Understanding anatomical changes post-procedure is crucial for long-term outcomes.
- Previous studies have not fully detailed vertebral and disc morphology changes.
Purpose of the Study:
- To analyze anatomical modifications in grafted and underlying vertebrae after Harrington's procedure.
- To investigate changes in vertebral shape, disc height, and lordosis.
- To correlate anatomical changes with long-term spinal tolerance.
Main Methods:
- Analysis of anatomical modifications on the 3 last grafted vertebrae.
- Assessment of the underlying healthy lumbar segment.
- Measurement of vertebral width-to-length ratio and lordosis distribution.
Main Results:
- Grafted vertebrae showed disc pinching and became taller than wide (width/length ratio decreased from 1.20 to 0.96).
- Lordosis in the underlying segment remained physiological but was redistributed.
- Increased lordosis percentage in vertebral bodies, particularly L4 and L5, was observed, linked to early and lower graft placement.
Conclusions:
- Harrington's procedure alters vertebral morphology and disc space.
- Changes in lordosis distribution may explain good long-term tolerance of the underlying mobile segment.
- Early and lower graft placement correlates with more pronounced vertebral wedging and lordosis changes.
Abstract:
After Harrington's procedure, the authors analyse anatomical modifications observed on the 3 last grafted vertebrae and on the underlying healthy lumbar segment. At the level of the grafted vertebrae it was observed a quite constant discal piching and a change in morphological aspect of the vertebra which become higher than large. The ratio between width and length physiologically at 1,20 was at 0,96. At the level of mobile underlying segment to the graft, lordosis remains at physiological value, although distributed on a shorter lumbar segment and that without change in discal angle. This fact was induced by an increase of the lordosis percentage incumbent to the vertebral body. This percentage physiologically at 10 passed 30 after Harrington's procedure because of an increased wedge-shaped of the 4th and 5th lumbar vertebra. This phenomenon was as much marked as the graft was precociously performed and as they descended lower. This might explain the good long term tolerance for the increased work of the free underlying rachis to a Harrington's procedure.