Help with a Character

[Canadian Army]

Currently I'm designing a survivalist character; as part of right-wing survivalist group, base in the pacific northwest. As part of his background the character he broke both his femurs and shattered both his hips while attending the Military Free Fall Parachutist Course. The problem I having is what kind of modifiers do I need for this character, I thinking for the character to do any type of movement, you would roll against Strength+Constitution. Does that sound right?