What are cartilaginous joints?

Cartilaginous joints are connections between bones where they are united by cartilage (either hyaline or fibrocartilage). They lack a joint cavity and allow limited or no movement, providing strength and flexibility, especially in the body's midline.

What is the difference between primary and secondary cartilaginous joints?

Primary cartilaginous joints (synchondroses) are united by hyaline cartilage, are immovable and temporary, and ossify with age. Secondary cartilaginous joints (symphyses) involve both hyaline cartilage and a fibrocartilage pad, are slightly movable and permanent, and typically occur in the midline.

What are examples of primary cartilaginous joints?

Examples of primary cartilaginous joints include the epiphyseal plate in growing long bones, the first costosternal joint, and the spheno-occipital synchondrosis.

What are examples of secondary cartilaginous joints?

Examples of secondary cartilaginous joints include the symphysis pubis, intervertebral discs, and the manubriosternal joint.

Why are primary cartilaginous joints considered temporary?

Primary cartilaginous joints are temporary because they undergo ossification with age, turning into bone (a process called synostosis). This is common in growth plates like the epiphyseal plate, which close at maturity.

How do secondary cartilaginous joints differ in movement compared to primary ones?

Secondary cartilaginous joints are slightly movable, allowing some flexibility, while primary cartilaginous joints are immovable. This difference is due to the fibrocartilage pad in secondary joints, which provides cushioning and limited motion.

What is the clinical significance of the epiphyseal plate?

The epiphyseal plate is a primary cartilaginous joint crucial for longitudinal bone growth. Injury to it can disrupt growth, potentially leading to limb shortening. On X-rays, it appears as a radiolucent gap that closes at maturity.

Cartilaginous Joints – Synchondrosis vs Symphysis

❓ Frequently Asked Questions