I shattered my knee cap in march 2013. Since then I have had 4 surgeries. The last one was to smooth out the back of the knee cap and to remove scar tissue and to tighten the meniscus that was loose. I was doing OK until I went to turn around and heard a popping sound followed by extreme pain for about 15 seconds. Since then every time I turn I have cramping and pain in the knee. My surgery was only 4 weeks ago. My surgeon said to wait 4-6 weeks to call if I am still in pain. The pain has got worse since the popping sound.. I am not sure if this was just normal healing or if this is something I should call the DR. about.