The elbow is the part of the arm that protrudes when the large and small arms are bent. It is the joint formed by the lower end of the humerus bone and the upper ends of the ulna and radius bones, and it can perform flexion and extension movements.
The elbow is at the junction of the large and small arms, and the part of the arm that protrudes when the large and small arms are bent is the elbow, also known as the elbow joint. The elbow joint is roughly 5cm long and is located at the point where the joints of the large and small arms meet above and below the elbow.
The elbow joint capsule is thick and tense on both sides, reinforced by the radial collateral ligament and the ulnar collateral ligament, and the posterior wall of the capsule is relatively weak. The movement of the elbow joint is dominated by the ulnar joint, which can perform flexion and extension movements.
Due to the structure of the elbow joint capsule, posterior dislocation of the elbow joint is more common when the elbow is injured. At this time, due to the change of the posterior triangle of the elbow, the radial and ulnar bones are dislocated posteriorly and move to the upper part of the posterior humerus. The ulnar nerve passes between the medial epicondyle of the humerus and the eagle’s beak of the ulna, and it is possible to injure the ulnar nerve when the elbow is dislocated or the medial epicondyle of the humerus is fractured.
Elbow discomfort promptly to the hospital, so as not to delay the condition.