I'm getting one put in my left knee next week.
I played with it in the doctor's office - this one doesn't look like it twists and turns as much as the one he showed me..
Oh, and by the way, I think they're very unusual. Good shot.
Interesting object -- very. I think it's well photographed, but I think a different background would enhance this image. The texture and color in this blue background are distracting, and don't complement the object.
Nicely lit, very centred composition. Slight problem with the focus - there are no edges on the front which is in focus so that it is not clear at first glance that any of it is in focus. Hmmm.