Hip impingement surgery is becoming more and more popular in sports medicine

   
 
Hip Procedure Grows Popular Despite Doubt  (NYTimes)
It is one of the most popular operations in sports medicine. It comes in various forms, all with the same name: Hip impingement or bone shaving surgery. World-renowned athletes have had the operation — the Yankees’ third baseman Alex Rodriguez had it about two years ago and the sprinter Tyson Gay had it last summer.

But some sports medicine researchers are asking: where is the evidence that shaving bone helps? Might the bumps or irregular shapes they call impingement be just normal variations? Does the shaved bone grow back?
And ...