Tscherne classification soft tissue injury associated with closed fracture. There are 4 types: Type 1: no to mild tissue injury Type 2: injury to skin and muscle with intact bone covering Type 3: injury to skin and muscle with stripping of periosteum Type 4: severe tissue injury associated with crush injury, communited fracture, Morel-lavallee lesion Reference: https://link.springer.com/chapter/10.1007/978-1-4471-6572-9_110 Image via: https://link.springer.com/chapter/10.1007/978-1-4471-6572-9_110