OP&#x2F;author here, I also have patella tendinitis since I dislocated my patella when I was 17.<p>This is the reason I started looking at ultrasounds, I figured that I could buy one for the $160 cost to get a scan from a doctor. I have looked around for a cheap ultrasound, but $1100 is far cheaper than I was able to find (I got to about $3k but looked like a dodgy dealer so didn&#x27;t link to it). But 1k is still way more expensive than I think it should be.<p>It should be a sensor you just plug into and iphone for a few hundred. I mean there is the <a href="http:&#x2F;&#x2F;www.thermal.com&#x2F;thermal-cameras&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.thermal.com&#x2F;thermal-cameras&#x2F;</a> thermal camera for only $250, why not ultrasound? Making a photo sensor must be thousands of times more complicated than ultrasounds sensors.<p>I just want to know why I can&#x27;t buy one cheaper than my massively more complex iphone :)