Gustilo Anderson classification for open fracture
I - clean wound <1cm length
II - wound >1cm in length but without any soft tissue damage and skin flap or avulsion
III - wound associated with extensive soft tissue damage,comminution,
contamination or segmental fracture.
-IIIA -adequate periosteal coverage present
-IIIB - significant periosteal stripping and it requires secondary bone covering procedures like skin flap or grafting.
-IIIC - open fracture with vascular injury that requires vascular repair