Brooks et al, 2010 completed a 5 year survey of skiers and snowboarders and the injuries they sustained. In that time period, over 6 million skier days were recorded. A total of 16945 injuries were recorded for a rate of 2.68 per 1000. Of them, 308 were cross country skiing and 1856 people did not have the location of their injury recorded- these were eliminated from the analysis. Of the remaining 14781, 10828 (73.3%) were injured on slopes and 3953 (26.7%) in terrain parks. In terrain parks, injured individuals were primarily young, male snowboarders and were more likely to have fractures and concussions. Terrain park injuries were also more likely to require hospitalization. Interestingly, those in the terrain parks were more likely to wear helmets but most of those suffering from concussion did not wear a helmet. Traumatic brain injury remains the number one cause of death for skiers and snowboarders. Companies managing these facilities should investigate requiring helmets.
It appears that the advanced aerial injuries that require high speed, strength and skill one would be attempting in terrain parks are more likely to lead to serious injury. One should point out however that many ski teams who practice aerial manoeuvers have national and Olympic facilities to practice at and it would be worth comparing their injury rates (particularly among those who are first entering that level of training).
So while aerial tricks do put one at higher risk for serious injury, they also take the risk of minor and moderate injury down greatly since only an expert can attempt these type of maneuvers safely.