Ultrasound machine, problems with knees, is it worth it??

Hello all,
I'm just recovering from left knee injury made during soccer game. Doctor said it's torn ligament but I should be able to start training again in 6 weeks time. The problem is the injury happened on 31 April and sometimes I'm still feeling little pain in my knee and it is swelling a bit after exercises like running, although I'm wearing a good brace. I know it takes time to recover (had similar but a lot worse injury to the right knee 6 years ago and had to stop playing professionally) but time is money for me now as I have just been invited for tryouts to professional team in England. The tryouts are going to be at the end of August so I would like to heal that knee (and strenghten other one) as fast as possible and focus on normal training routine.
I'm taking glucosamine, collagen type II, omega 3 oil, couple other suplements and rehab that knee daily using wobble board etc.
Lately I've heard about portable ultrasound machines, like that for example:

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http://cgi.ebay.co.uk/PORTABLE-1MHZ-AND-3MHZ-ULTRASOUND-MACHINE-THERAPY-UNIT-/260803480041?pt=UK_BOI_Medical_Lab_Equipment_Medical_Specialisations_ET&hash=item3cb91949e9#payId

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My question is do you guys think it is worth buying?? Can ultrasounds from portable machine like that help me recover faster? And also is it safe to use? I wouldn't like to make any further harm to myself as time is really important to me now.
Maybe I should rather focus on sth else?? Any ideas/suggestions??
Thanks in advance:o

Hi,
We are a U.K. manufacturer of medical devices. I am sure our device could help you rehabilitate your knee and will also help with most sports injuries. Please visit our website at www.neurocareeuropelimited.com You can telephone us if you need more information 0115 9501597. Regards Patricia Forrester

Personally, I would recommend getting a good foam roller and using it everyday. I really like the rumble roller, because it has ridges on it that allows for deeper penetration into the muscle tissue. But, you can also get a regular foam roller too. I suggest foam rolling, because it will get good results and is much more economical than a machine like that.

Thanks a lot markmiller I'm just ordering one roller. Is there any other equipment/supplement that you guys think I should invest in??

You can also use a tennis ball or lacrosse ball for the chest, shoulders and glutes. You don't have to spend a lot of money or buy a lot of junk. Start with the foam roller and go from there...