There are two parts to the operation - to insert a metal fixation either side of the spine to straighten it, and to fuse together the vertebrae that are out of alignment and causing the twist.

He told me that they would be putting a metal rod either side of my spine, secured by bolts, to keep it straight. He kept saying the operation was straightforward, but I was still worried.

Exercise 2: Cat/cow stretch In yoga, it's called Chakravakasana. Get on your hands and knees, hands shoulder-width apart, knees directly below your hips, spine straight. Now go into the cat pose: ...