According to Wrestling Observer Radio, Sting underwent medical testing yesterday, following his NoC injury, which revealed his neck wasn’t broken.
Sting apparently underwent both a CAT scan and a MRI. No fractures were detected.
Despite this positive news, no fractures of the spine or the neck, it seems likely that even if Sting returns at 100%, WWE officials might hesitate at putting him back in the ring after what can be considered a close call.