Kyynärniveltä

Kyynärniveltä, also known as the elbow joint, is a complex hinge joint in the human arm connecting the humerus (upper arm bone) with the radius and ulna (forearm bones). It allows for flexion (bending) and extension (straightening) of the arm, as well as pronation and supination of the forearm, which are the movements that turn the palm downwards and upwards, respectively.

The elbow joint is formed by three distinct articulations: the humeroulnar joint, the humeroradial joint, and the proximal radioulnar joint. These are all enclosed within a single joint capsule. The humeroulnar joint is the primary articulation responsible for flexion and extension. The humeroradial joint assists in these movements and also contributes to rotation. The proximal radioulnar joint, located near the elbow, is responsible for pronation and supination.

The stability of the kyynärniveltä is provided by a network of ligaments, including the medial collateral ligament and the lateral collateral ligament. Muscles surrounding the joint, such as the biceps brachii, triceps brachii, brachialis, and brachioradialis, also play a crucial role in its movement and stability.

Injuries to the kyynärniveltä can range from common conditions like tennis elbow and golfer's elbow, which are forms of tendinitis, to fractures and dislocations. Overuse, trauma, and certain degenerative conditions can affect the function of this vital joint, impacting an individual's ability to perform everyday tasks. Rehabilitation often involves physical therapy to restore range of motion and strength.