Andre, thanks for the details. I would hope you bear in mind that my post is written in the spirit of making informed comment, nothing would connect the dots with more emphasis and likely value for you than seeing a physio who is capable of understanding your problem and offering apropriate therapy.
From the detail you offer it appears you have what is commonly known as PFPS. Or patello femoral pain syndrome. This was once thought to be an arthritic disease and called Chondromalachia Patella, during which period ( medically speaking )it was treated with a combination of exasperation and ill conceived surgery.
More recently however it is better understood to be a referred pain and dysfunction problem arising from protective behaviour in the mid lumbar spine. In particular L3.
I have explained protective spinal behaviour elsewhere on these pages so I won't go into detail on this here. Suffice to say it is entirely treatable in the right hands with no attention whatever required at the knee. You will however find many therapists who have yet to be aquainted with Continuous Mobilisation as a method to restore a non threatened, normaly mobile spine. with this hands on method . It is possible with , usually , the first treatment ( according to my own experience and that of those I have trained ) to reduce pain , using, for instance, a full squat as a test, in under thirty minutes, by up to 80 percent, by treating only L3 with Continuous Mobilisation. Further attention with this method will restore , in most cases , a fully mobile joint to this part of the spine, allowing irflammatory irritation to be resolved at the point where that part of the Femoral nerve exits the spine.
A full consideration of factors associated with these non pathlogical spinal behaviours will be of value in ultimately eliminating this problem in the long term.
Attention to the vastus medialis oblique muscle with either taping or exercise may yield temporary , or even no result. This is because the poor holding patterns seen in cases of PFPS, to this important patella guiding and holding muscle ( on the inside of your knee ) is often disturbed by the same mechanism that causes pain , that being, irritation to the relevant nerve root at the spine.
This may sound persuasive or not , but the only way to find out ultimately is to have someone examine and treat your mid lumbar spine with CM.
For those therapists taking an interest in Cm and other aspects of this approach , further detail is available on this site , or Rehabedge.com, using key words PFPS, Ginger,CM etc., where I have discussed this on previous posts.
best of luck.