What does the knee joint do?

Function of the Knee Joint:

The knee is the largest and one of the most complex joints in the human body. It plays a crucial role in daily activities, such as walking, running, jumping, squatting, and kneeling. It allows for both flexion and extension movements, as well as slight internal and external rotation.

Here's a closer look at the functions of the knee joint:

1. Support and Stability:

- The knee joint bears most of the body's weight during standing and walking.

- It provides biomechanical stability during these activities and helps maintain proper joint alignment.

2. Flexion and Extension:

- Flexion (bending) and extension (straightening) are the primary movements of the knee joint.

- These movements allow for various activities, including sitting, standing, walking, climbing, and squatting.

3. Slight Rotation:

- The knee joint permits a small degree of internal and external rotation.

- Internal rotation helps turn the foot inward, while external rotation turns the foot outward.

4. Shock Absorption:

- Structures within the knee, including the menisci and articular cartilage, help absorb shock and reduce impact during activities like walking, running, and jumping.

5. Muscle Action:

- The knee joint works in conjunction with surrounding muscles, including the quadriceps (front of the thigh) and hamstrings (back of the thigh).

- These muscles control knee movements, provide strength, and contribute to stability.

6. Synovial Fluid Lubrication:

- The knee joint contains a synovial membrane that produces synovial fluid.

- This fluid acts as a lubricant, reducing friction and aiding in smooth joint movement.

7. Patellofemoral Joint:

- The knee includes the patellofemoral joint, formed between the patella (kneecap) and the femur (thigh bone).

- This joint helps distribute forces and protects the knee from excessive strain during activities.

Overall, the knee joint's primary functions are to provide support, facilitate controlled movement (flexion and extension), and absorb impact during various daily activities. Understanding the knee joint's functions helps appreciate its intricate design and the importance of maintaining its health for overall mobility and quality of life.