A reasonable answer to a musculoskeletal issue isn't usually a special gadget or a magic pill. Anyone seriously considering treatment of your issue would first do a good physical examination to identify the structure that is causing your discomfort and then refer you to a proper professional to help you with your issue if it was out of his/her expertise.
While physical modalities can be a helpful adjunct to a treatment plan, they are not meant to replace a proper regimen. Also, I'm doubtful of the claims that product makes. It claims to be a solution to get heat into joints and such. Any traditional heating modality should be effective up to 4-ish cm. Ultrasound should get down a little further. An electromagnetic field is sometimes used for bone stimulators, but I've never seen it used for this purpose. Maybe we should all start playing under power lines.
The biomechanics that deal with the knee are complicated. You basically need to see someone who understands them and can help you correct them.
I would also probably remove that referral link.
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