What happens to muscles in a crush injury?

In a crush injury, the following happens to the muscles:

1. Compression: The initial impact of a crush injury compresses the muscles, causing immediate damage to the muscle fibers.

2. Ischemia: The compression can cut off the blood supply to the muscles (ischemia), depriving them of oxygen and nutrients. This can lead to muscle cell death.

3. Rhabdomyolysis: The death of muscle cells can cause a release of their contents, including a protein called myoglobin, into the bloodstream. This condition is known as rhabdomyolysis.

4. Compartment Syndrome: In some cases, the swelling and inflammation from a crush injury can cause increased pressure in a muscle compartment (a section of the body that contains muscles and nerves), leading to further damage. This is known as compartment syndrome.

5. Systemic Effects: If not treated promptly, the myoglobin from rhabdomyolysis can cause kidney damage. In severe cases, a crush injury can also lead to shock or even death.

6. Healing Process: If the person survives, the healing process involves inflammation and repair. Scar tissue may form in the damaged muscles, which can lead to long-term problems with movement and function.

7. Rehabilitation: Physical therapy and other forms of rehabilitation may be needed to restore function to the affected muscles.