The term 'knee cartilage' could refer to either the meniscal cartilage(s) or the articular cartilage.
Acute and Stress-related Injuries of Bone and Cartilage: Pertinent Anatomy, Basic Biomechanics, and Imaging Perspective. Pathria MN, Chung CB and Resnick DL. Radiology. July 2016; 280(1): 21–38.