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Figure 1. Arthroscopic and x-ray view of the knee. The joint line of the knee that shows up on x-rays is not an empty space (red circle). The “space” is occupied by articular (AC) and meniscal (M) cartilage. Articular cartilage provides a frictionless gliding surface for motion and helps transmit weight across the joint. The knee has 2 meniscal cartilages (medial = inside and lateral = outside). These make the joint more congruent, absorb shock, and transmit forces across the joint.
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