Complications of crush injuries mainly include the following: 1. Crush injuries can lead to complications such as fractures and bleeding; 2. Crush syndrome: wheel crushing the limb can destroy cells and lead to the release of toxins from red blood cells, which can trigger complications such as hyperkalemia and acute renal insufficiency in patients; 3. Triad of trauma fatalities: mainly includes temperature failure, disorders of coagulation mechanism and acidosis; 4. Postoperative infections: including stump infections, respiratory infections, urinary tract infections and bloodstream infections.