SANTA FE, N.M. (AP) _ New Mexico Gov. Gary Johnson fell on ice Wednesday and suffered compression fractures in his upper spine but will not require surgery or have permanent effects, his doctor said.

Johnson, 48, could be released from St. Vincent Hospital by Friday depending on his levels of mobility and pain, said neurosurgeon Dr. Erich Marchand, who treated the governor.

Johnson was in good condition and was joking with the hospital staff, said his spokeswoman, Diane Kinderwater.

Johnson canceled plans to attend Saturday's inauguration of George W. Bush.

The Republican governor slipped and fell while running about 5 a.m. near the Santa Fe home where he is living while the governor's mansion is being renovated, she said.

Johnson is an avid triathlon competitor and an expert skier. He underwent surgery and physical therapy in 1996 after detaching a knee ligament in a ski accident.