What is the elbow joint?
The elbow joint is the point where the arm meets the forearm. It is a complex joint as there are two joints within the same spot, that is, the joint between the humerus (arm) and ulna (one of the two forearm bones), as well as between the radius (the second forearm bone) and the humerus (arm).
The elbow joint is a synovial joint, meaning that it is enclosed by a fluidic capsule that helps to lubricate articulation. This capsule is medially and laterally thickened to create collateral ligaments, which works to stabilise the extending and flexing motions of the arm.
The elbow bursa is a membranous sac containing synovial fluid, which offset the friction caused by the articulation of the joint. The important bursae in the elbow joint are the intratendinous, subtendinous, and subcutaneous (olecranon).
The elbow’s joint capsule is also reinforced by a series of medial and lateral ligaments (annular ligament, ulnar collateral ligament, and radial collateral ligament).