Here's the matching:
1 - D, bone - a strong, hard part of a body's structure
2 - F, marrow - a soft substance with immune functions
3 - E, impacted - having parts crushed together
4 - C, greenstick - the breakage of a young, soft bone
5 - A, compound - having bone protruding through the skin
6 - G, comminuted - being broken into several pieces
7 - B, stress fracture - a minor crack in a bone