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.
Department of Orthopaedic Surgery, Children's Hospital of Wisconsin, Milwaukee 53226, USA. Ckalies@mcw.edu
J G
JG
Thometz
R
R
Lamdan
X C
XC
Liu
R
R
Lyon
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