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Joints of The Human Body

Joints of the Body

Have you ever wondered how many joints you have in your body? Or maybe you have always wondered how they work to facilitate movement. Did you know your body has a total of 360 joints. You body has 206 bones. At every point where these bones intersect there is a joint.

Joints of the Human Body

A joint is defined as the point of contact between two or more bones. This  point of contact provide mechanical support for the human body. All joints in your body are classified in four categories. This classification can be based on two factors;

Function: This is the role played by a joint in terms of possible movement.

Structure: This refers to how bones are attached to each.

The major joints categories in the body are pivot joints, hinge joints, saddle joints, and ball and socket joints. All of them facilitate free movement without bones knocking each other.

Joints Categories

The major joints categories in the body are:

  • pivot joints,
  • hinge joints,
  • saddle joints,
  • and ball and socket joints.

They facilitate free movement without bones knocking each other.

Ball and Socket

This joint is formed in places where one bone has a ball-shaped or a rounded surface that fits into a cup-shaped or concave depression found on the other bone. This contact between bones with such structures forms a synovial joint. It can allow a movement of 360 degrees. Joints on the hip region are examples of a ball and socket joint where the femur bone fits into the pelvis cavity.


Hinge joints operate the way a door does. It allows a single plane movement just like closing and opening a door. Strong ligaments connect the bones and aid in movement. Examples of hinge joints are the knee, between fingers, and the elbow.


This joint is formed when one two bones meet with one having a bony cylinder and the other having a ring-like structure. Movement of this joint is usually a half circle and it occurs when one bone rotates around another. One example of this type of joint is where the first spine vertebra joins the skull to the second spine vertebra. This joint facilitates rotation of the head.

Gliding Joint

This joint is formed when bony surfaces holding a synovial joint are slightly rounded or flat. This joint facilitates a wide array of movement between bones as one bone slides past the other allowing free movement. Examples of sliding joints are the points of intersection between the small eight bones of the wrist and of the spine vertebrae.

Just like other parts of the body, joints have disorders as well. Joints can sustain injuries through activities, accidents and diseases. Some joint disorders can be severe and may deeply impair your movements.

The most common degenerative joint diseases in the human body are:

  • arthritis,
  • osteonecrosis
  • and osteoporosis.


It is important that you seek medical attention whenever you experience joint pain or suffer injuries that cause pain in any of your joints.

For more information and Ful Diagrams on joints please check this out.

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Test Your Knowledge

How Many Bones in the Human Body?

An adult has a total of 206 bones in their skeleton

How many Bones in a Child's Body?

A newborn baby has 270 bones in the skeletal system. Most of their skeleton is made up of cartilage which forms bone as it hardens over time. The bones in a child's skeleton fuse together as they grow, reducing the number, up until about 25 years old.

What is The Strongest Bone in the Human Body?

The femur or thigh bone is the strongest bone in the body. It is situated between the pelvis and the knee. It is also the longest bone in the body and is fully one quarter of your bodies' height.

What is the Weakest Bone in The Body?

The weakest bones in your body are the tiny bones inside your ear that enable you to hear. On the other hand; the most commonly fractured bone is the clavicle.

What is the Hardest Bone in the Body?

The hardest bone in the body is the petrous portion of the temporal bone. The temporal bones are found at the sides and base of the skull and the petrous portion is specifically the part at the base of the skull that contains the organs for hearing.

Where are the Smallest bones in Your Body Located?

The smallest bone in the body is called the stapes. It is a stirrup shaped bone found inside the ear drum that transmits vibrations enabling us to hear.

How many Bones are in the Leg?

A human leg contains 30 bones. There are 26 bones that make up the foot, and the four major bones of the leg, which are the thigh bone (femur), the shin bone (tibia), the calf bone (fibula) and the knee cap (patella)