Where Are Joints Used?
Joints are used in a surprisingly wide variety of contexts, far beyond just the human body. Let's explore some key areas:
As the provided text states, a joint is "the part of the body where two or more bones meet to allow movement". The type of joint determines the range of motion. Examples include ball-and-socket joints (like the hip), hinge joints (like the elbow), and pivot joints (like the neck). Adults have approximately 350 joints, which are essential for all movement. [^1] The greater the range of motion, however, the higher the risk of injury. [Reference 1]
2. Construction and Engineering
In construction, joints are crucial for managing expansion and contraction in materials like concrete. Expansion joints, for example, are designed to accommodate movement caused by temperature changes, preventing cracks. Filling these deep expansion joints requires specialized materials, going beyond simple dirt or sand; materials like expanding foam and concrete sealant are often needed. ^2
3. Gypsum Board and Drywall Finishing
In the construction and home improvement sector, "joints" refer to the seams between drywall or gypsum board pieces. Specialized joint compounds are used to create a smooth, seamless finish. These compounds are applied using techniques like tape application, fastener spotting, and texturing. ^3
4. 3D Modeling and Animation Software
In 3D animation software like Maya, "joints" are used as a fundamental part of the skeleton or armature of a 3D model. These joints allow for posing and animation of the model. The "head end joint" is particularly important for orienting the head of the model. ^4
5. Adhesives and Materials Science
The term "joints" also applies to the connections created by adhesives in various materials. Research investigates the durability and crack growth rate of such adhesive joints, especially in high-stress applications like high-speed crafts. ^7
6. Robotics
In robotics, joints are the crucial points that enable the robot's movement. Controlling and limiting the use of these joints is an important aspect of robot programming, ensuring smooth and efficient operation. ^8
7. Libraries
In a less literal sense, "joint-use libraries" refer to facilities where two or more distinct library service providers share the same building to serve different client groups. [^6, ^10]
References
[^1]: A joint is the part of the body where two or more bones meet to allow movement. Generally speaking, the greater the range of movement, the higher the risk of injury because the strength of the joint is reduced. The six types of freely movable joint include ball and socket, saddle, hinge, condyloid, pivot and gliding.
