Relationship between Quantec measurement and Cobb angle in patients with idiopathic scoliosis.
The Quantec Spinal Imaging System (QSIS) is a raster stereography used to measure three-dimensional trunk images. The Q angle, a coronal plane measurement generated by the Quantec Spinal Imaging System (QSIS), was compared with the Cobb angle in assessment of scoliosis curve magnitude. One hundred forty-nine patients with idiopathic scoliosis were evaluated using both the Quantec system and plane radiographs. The Cobb and Q angles demonstrated significant correlation in the thoracic region (r = 0.65, p < 0.05), lumbar region (r = 0.63, p < 0.05), and in the thoracolumbar region (r = 0.70, p < 0.05). The difference between the Q and Cobb angles was small when the Cobb angle was <21 degrees with less than 6 degrees of axial surface rotation, as measured by the QSIS method. For smaller curves with minimal rotation, there is close correlation between the Cobb angle and the Quantec angle.
Thometz
J G
JG
Department of Orthopaedic Surgery, Children's Hospital of Wisconsin, Milwaukee 53226, USA. Ckalies@mcw.edu
Lamdan
R
R
Liu
X C
XC
Lyon
R
R
D000293:Adolescent; D000704:Analysis of Variance; D002648:Child; D002675:Child, Preschool; D003936:Diagnosis, Computer-Assisted; D005260:Female; D006801:Humans; D008297:Male; D015588:Observer Variation; D010781:Photography / Q000295:instrumentation*; D011859:Radiography; D012600:Scoliosis / Q000175:diagnosis* / Q000000981:diagnostic imaging