Who gets PVNS and why?
Doctors don't know exactly what causes PVNS. It doesn't seem to run in families. It doesn't seem to be caused by certain jobs or activities.
Pigmented Villonodular Synovitis of the Hip and Knee by FJ Frassica, M.D., MA Bhimani, M.D., EF McCarthy, M.D., and J Wenz, M.D. (American Family Physician October 01, 1999, http://www.aafp.org/afp/991001ap/1404.html)
Written by familydoctor.org editorial staff