Hinge Joint at Knee and Arm

The joints at the knee and arm are different from each other. The joint present at both these places is a hinge joint.

Definition of Hinge Joint

A hinge joint is a type of synovial joint that allows flexion and extension movement along one axis. It is formed by the articulation of two bones, one convex and the other concave, which are held together by ligaments and surrounded by a joint capsule filled with synovial fluid.

Hinge Joint at Knee

The knee joint is the largest hinge joint in the human body. It is formed by the articulation of the femur, tibia, and patella bones. The femur bone has two rounded condyles that fit into the tibia bone's shallow depressions, forming a hinge-like joint. The patella bone, also known as the kneecap, is a small, triangular bone that is embedded in the tendon of the quadriceps muscle. It acts as a mechanical lever that increases the force of the quadriceps muscle on the tibia bone, allowing the leg to straighten.

Hinge Joint at Arm

The elbow joint is another example of a hinge joint. It is formed by the articulation of the humerus, radius, and ulna bones. The humerus bone has two rounded condyles that fit into the shallow depressions of the ulna bone, forming a hinge-like joint. The radius bone is located on the lateral side of the ulna bone and rotates around it, allowing the forearm to rotate as well.

Conclusion

In conclusion, the joint present at the knee and arm is a hinge joint that allows flexion and extension movement along one axis. It is formed by the articulation of two bones, one convex and the other concave, which are held together by ligaments and surrounded by a joint capsule filled with synovial fluid.

Answer is ball and socket joint