Drew Hildner of the Rocky Mountain Rescue Group said steep slopes and an unsteady boulder field made the four-hour rescue effort tough, the television station reported.
"It's almost like solving a complex math problem," Hildner told KDVR. "You have to make sure if you're moving one thing, you're not going to shift everything else as well."
Hildner said his crew used air bags, pulleys and lifts to free the man. “We were able to roll the boulder just enough to free the patient's foot and leg,” Hildner told the television station. “It requires thinking outside the box, using multiple different solutions."
The victim, whose identity has not been released, was taken to a hospital with serious but non-life-threatening injuries, KUSA reported.