What is cartilage and what is its main function in the human body?

Cartilage is a flexible yet strong connective tissue that covers the ends of bones at joints. It also provides shape and support to other parts of the body such as the ears, nose, and trachea [2]. Its main function is to facilitate movement by allowing bones to slide over one another smoothly, and to protect bones from direct friction that could lead to wear and pain [1].

Structure and Function of Cartilage

Cartilage is composed of specialized cells known as chondrocytes, which are surrounded by an extracellular matrix rich in collagen, elastic fibers, and mucopolysaccharides. This composition gives cartilage its characteristic properties of flexibility and durability. Without cartilage, bones would wear out quickly due to constant friction during movement, leading to severe pain and restricted mobility [1].

Types of Cartilage in the Body

• Articular (Hyaline) Cartilage: This type is the most common and covers the bone surfaces in movable joints such as the knees, elbows, and hips. Its primary function is to reduce friction and absorb shock [1].
• Fibrocartilage: Found in areas requiring high strength and durability, such as the intervertebral discs in the spine, which provide some flexibility for movement [1].
• Elastic Cartilage: Characterized by high flexibility and found in the outer ear and nose, where it provides support and shape [2].

The Importance of Cartilage for Joint Health

Healthy cartilage is essential for maintaining normal joint function. When cartilage is damaged, whether due to injuries, repetitive stress, excess weight, or certain types of arthritis such as osteoarthritis (degenerative arthritis), symptoms like pain and restricted movement can occur. Cartilage damage can also lead to long-term joint damage and deformity [2].

When Should You See a Doctor?

If you suffer from persistent joint pain, swelling, difficulty moving a joint, or if there is a clicking or grating sound when moving, it is important to see a doctor to evaluate the condition. A doctor's visit can help identify the cause of the pain and establish an appropriate treatment plan before the problem worsens. In some cases, chest pain associated with cartilage, such as costochondritis, may mimic heart attack pain; in such instances, emergency care must be sought immediately [3]. To learn more about cartilage disorders, you can visit Cartilage Disorders: Understanding Pain, Diagnosis, and Modern Treatment Options (Arabic).

Tips for Maintaining Cartilage Health

To help maintain cartilage and joint health, it is recommended to adopt a healthy lifestyle that includes avoiding joint injuries, exercising regularly to strengthen the muscles surrounding the joints, maintaining a healthy weight to reduce pressure on them, and eating a balanced diet. These measures can reduce the risk of cartilage damage and help maintain joint flexibility [1].

Medical references

• Health Lesson: Learning About Joints
• Cartilage Disorders
• Costochondritis