Electrotherapy uses electrical machines to help in an injury process.  This can include a variety of machines such as: 

• Transcutaneous electrical stimulation (TENS)
• Ultrasound (US)
• Interferential current (IFC)
• Electrical muscle stimulation (EMS) and others.  

In many cases, these machines are used to help improve blood flow, reduce pain, or get the muscles moving which can optimize the recovery process.  These units used at the appropriate time in the recovery process can facilitate optimal injury healing.