Full spine X-rays are used to establish a baseline and observe for changes. A measurement called the Cobb angle is used to measure the curve on the X-ray. X-rays must be repeated as the child grows. The Cobb angle is measured each time and compared with the last measurement. An increasing angle signals a scoliosis that is getting worse. With this method, children are exposed to repeated doses of radiation.

Researchers from the Children's Hospital of Wisconsin (CHW) have found a way to monitor scoliosis without using X-rays. The tool used is called the Quantec system. This system is not invasive and does not use X-rays. It is a camera that takes a 3-D scan of the spine. Using the data collected with specific formulas, a Q-angle can be determined.

In this study, children with scoliosis had X-rays taken and then they were scanned by the Quantec system. The authors compared the Q-angles from the Quantec system against the Cobb angles from the X-rays.

They found that the Quantec system was useful and reliable in classifying patients in one of two groups. The groups were based on size of spinal curve (less than 20 degrees and 20 degrees or more). In fact, the Quantec system detected curve progression one year earlier than X-rays.

This is the first study of children with scoliosis using the Quantec system. Early results suggest it is a reliable and accurate tool used to monitor scoliosis. It works best with mild-to-moderate curves. Best of all, the child is not exposed to potentially harmful X-rays.