The document discusses the lamina splendens, a thin surface layer of articular cartilage. It describes debate around whether the lamina splendens truly exists or is an optical illusion. Evidence from electron microscopy and physical peeling suggests it is a distinct layer with interwoven collagen bundles. The lamina splendens provides resistance to shear forces at the joint surface and drives appositional growth of cartilage. It may play an important mechanical role in withstanding loads and reducing friction that is critical for cartilage function and repair.