The pubic symphysis is formed by a mixture of cartilage and fibrous tissue; which substance is associated with its repair/injury response according to the material?

• A. Hyaline cartilage
• B. Fibrous tissue
• C. Fibrin
• D. Elastic cartilage

Answer: (C)

Repair in a fibrocartilaginous joint like the pubic symphysis starts with the clotting system forming fibrin at the injury site. Fibrin creates a provisional mesh that traps blood cells and serves as a scaffold for inflammatory cells and fibroblasts. This scaffold is essential for the initial healing steps, guiding the migration of cells that lay down new collagen and cartilage matrix and directing tissue remodeling. The pubic symphysis contains cartilage and fibrous tissue, so the early injury response prominently involves this fibrin-based provisional matrix to organize repair. Structural cartilages such as hyaline or elastic cartilage are not the immediate drivers of the injury response, and while fibrous tissue is a normal component of the joint, the substance most characteristically linked to the repair process itself is fibrin.