When I tore my wrist ligament (slip and fall on the ice - OUCH), i went to physical therapy and they used an ultrasound on it - it really helped so i bought my own. There are a few home-use/portable ultrasounds, but I used Sonic Relief and was very pleased with it. The cost was reasonable and my PT liked that I used it at home. It's worth a try esp. for someone who is susceptible to regular injury (athletes, seniors, laborers). Hope this helps!