Nick Alexander sustained a serious knee injury in a crash at the landing of his final jump in the mixed team competition at the World Championships in Falun (SWE).

The American has already returned home where the exact injuries were diagnosed in an MRI examination earlier this week. A"s was expected, my ACL is completely torn. Other injuries include strains to my LCL, MCL and PCL ligaments, both menisci have been torn, and a chunk of cartilage has broken off and taken with it a small piece of femur bone", the 26-year-old writes on his facebook page.

Nick Alexander will now undergo surgery on Monday, then starts the long way back. "I will be unable to do any weight bearing activities for the first six weeks after surgery, so I will be constrained to crutches for that period of time. An extensive rehabilitation period of physical therapy will follow. My doctors and physical therapist expect me to be able to take my first jumps six to nine months from the date of surgery", the athlete from New Hampshire continued.