No there is not.
Ultrasound is what they normally use for little babies. After a few months old they use MRI. It is the ONLY way to detect tethered cord and or anamolies of the spinal column.
The slight risk of an Ultrasound should not deter you from finding out if your child has something wrong. You need to understand with tethered cord it is attached. As the child grows the spinal cord becomes stretched which cause nerve damage. Nerve damage for the most part is irreverseable. We are talking bladder, bowel, lower extremities etc.
My child has Lipomyelomeningocele, Tethered Spinal Cord, Neurogenic Bladder and Neurogenic Bowel. She was born with a hemangioma at the base of her spine. By two months of age we knew something was terribly wrong. Her left leg was cold and purple. Her foot dropped down and in. The circumference of that leg was smaller than the right. Prior to two months we had concerns about the hemangioma but were told time and time again it was normal.

The slight risk of an Ultrasound should not deter you from finding out if your child has something wrong. You need to understand with tethered cord it is attached. As the child grows the spinal cord becomes stretched which cause nerve damage. Nerve damage for the most part is irreverseable. We are talking bladder, bowel, lower extremities etc.
My child has Lipomyelomeningocele, Tethered Spinal Cord, Neurogenic Bladder and Neurogenic Bowel. She was born with a hemangioma at the base of her spine. By two months of age we knew something was terribly wrong. Her left leg was cold and purple. Her foot dropped down and in. The circumference of that leg was smaller than the right. Prior to two months we had concerns about the hemangioma but were told time and time again it was normal.