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Surface stereophotogrammetry of thoracic kyphosis
A J Carr1, R J Jefferson, A R Turner-Smith
1Oxford Orthopedic Engineering Centre, Nuffield Orthopedic Centre, Headington, U.K.
Acta Orthopaedica Scandinavica
|April 1, 1989
Summary
Surface stereophotogrammetry using the Integrated Shape Imaging System (ISIS) accurately measures thoracic kyphosis. This method revealed significant kyphosis reduction after surgery and development of hypokyphosis with bracing in adolescent idiopathic scoliosis patients.
Area of Science:
- Orthopedics
- Biomedical Engineering
- Radiology
Background:
- Adolescent idiopathic scoliosis (AIS) and Scheuermann's disease are spinal deformities affecting thoracic kyphosis.
- Accurate measurement of thoracic kyphosis is crucial for diagnosis and treatment monitoring.
- Surface stereophotogrammetry offers a non-invasive method for assessing spinal alignment.
Purpose of the Study:
- To evaluate the accuracy of Integrated Shape Imaging System (ISIS) scans for measuring thoracic kyphosis compared to radiography.
- To assess the impact of corrective surgery and conservative bracing on thoracic kyphosis in AIS patients using ISIS scans.
Main Methods:
- Thoracic kyphosis angles were measured radiographically and using ISIS surface stereophotogrammetry in normal individuals, Scheuermann's disease patients, and AIS patients.
- ISIS measurements were subsequently used to analyze changes in thoracic kyphosis in AIS patients undergoing surgery or bracing.
Main Results:
- A high correlation was found between radiographic and ISIS measurements of thoracic kyphosis.
- Surgical correction of AIS resulted in a significant reduction in thoracic kyphosis.
- Conservative bracing for AIS led to the development of hypokyphosis, with no observed association to curve progression.
Conclusions:
- ISIS surface stereophotogrammetry is a reliable method for measuring thoracic kyphosis.
- Surgical intervention effectively reduces thoracic kyphosis in AIS.
- Bracing may lead to hypokyphosis in AIS patients, but this does not correlate with curve progression.