Prevalence of Crystals in Knee Osteoarthritis: Experience From Patients Undergoing Arthroscopic Procedures. Issue 1 (January 2019) - Ike, Robert; Baskaran, Amrutha; Chao, Jeannie; Concoff, Andrew L.; Wu, Christopher W.; Sun, Bob; Brion, Paul H.; Arnold, Erin L.; Klashman, David J.; FitzGerald, John; Kalunian, Kenneth C.