i had hip replacement last May 2015 after i went home after 2weeks, my hip popped out of joint. This kept happing  every 2-3 weeks my doctor said i have loose joints. I had never heard of this.  He finally went and put a collar on the hip.  It has not popped out of joint any more but it makes a lot of noise.  Have you ever heard of this or is he trying to cover up for something he done wrong.