It depends from the factors how deep is wound and how much damage is there. They would do tests and scans to determine that, and after that they would decide is there need for stitches, and repairing of soft tissue, bones.
Also it is important how old is wound and is there already signs of infection.
Smaller wounds without organ damage would left open for cleaning and continuous drainage, bigger and deeper wounds (for example abdomen) would require revision and repairing -stitches and more complicated work.
Infection is always trouble there, so antibiotics would be considered, and tetanus shot.