The scans will be performed at UBC's High Field Imaging Centre on the 3T Phillips Intera scanner. Dr. Wilson has access to this scanner for his research. The scanning protocol is as follows: 3D IR-TFE sequence with TR/TE/Flip of 4.7 ms/1.6 ms/30 o and seven inversion times; 1600, 1200, 800, 400, 200, 300, and 100 ms. In-plane resolution is 0.7 mm with a slice thickness of 3 mm. Total imaging time is approximately 1 hour (at each visit). The T1 calculated image will be obtained using validated, custom written software (IGOR). The resulting image provides a map approximating glycosaminoglycan concentration and, consequently, cartilage degeneration.