Pietrosimone B, Nissman D, Padua DA, Blackburn JT, Harkey MS, Creighton RA, Kamath GM, Healy K, Schmitz R, Driban JB, Marshall SW, Jordan JM, Spang JT. Associations between cartilage proteoglycan density and patient outcomes 12months following anterior cruciate ligament reconstruction. Knee. 2018 Jan; 25(1):118-129.