Jackson Racing posted the following update from Steve's wife a couple of hours ago:

Just to give you an update Steve had surgery early Thursday morning for pelvic and leg injuries which went as well as the doctors could have hoped at this stage. Other injuries include a broken ankle, heel, T12 vertebrae, a fracture to his larynx and damage to his neck which means he’s not currently able to breathe for himself without support. They’re keeping him heavily sedated most of the time to make him more comfortable whilst he recovers from his injuries. Thank you so much to everyone who has helped us to get over to him so quickly and for the hundreds of messages of support we have received. I have been reading some of your messages out to him to let him know everyone is rooting for him to get better. I’m sorry to everyone I haven’t replied to yet, Steve and the boys are keeping me busy, but I will try to get back to you all over the coming days. X