Enarthroses owe their marked mobility to the articular surfaces that constitute them and to the way in which these surfaces interact with each other: in enarthrosis, there is a perfect interlocking between an articular surface in the shape of a spherical ball and an articular surface in the shape of a hollow circular.
Enarthrosis are characterized by abduction, adduction, rotation, flexion and extension movements.
In the human body, there are essentially two enarthroses present: the glenohumeral joint of the shoulder and the hip joint.
According to a more technical definition, diarthrosis are the mobile joints of the human body that join two bone surfaces through a structure called the joint capsule, which is in close contact with the periosteum of the same bone surfaces involved.
In addition to the joint capsule, diarthroses typically also consist of: a pair of joint surfaces, the synovial cavity and joint cartilage.
Sometimes, other structural components can be added to the basic elements typical of every diarthrosis, such as: fibrocartilage discs (or menisci), cushions of adipose tissue, intra- and / or extra capsular ligaments, tendons and synovial bags.
There are various types of diarthrosis: flat diarthrosis (or arthrodias), hinged diarthrosis (or ginglimi), pivot diarthrosis, condyloid diarrhosis (or condylarthrosis), saddle diarthrosis and sphere diarthrosis (or enarthrosis).
To learn more: What are Diarthrosis? , lined with periosteum, which take part in the constitution of a "joint.The two articular surfaces of the enarthrosis are the "most characteristic element of the latter": one is a ball-shaped prominence, while the other is a spherical hollow.
In going to form the enarthroses, the ball-shaped articular surface fits perfectly within the articular surface similar to a spherical recess.
The particular morphology of the aforementioned articular surfaces and the way in which these surfaces interact with each other are the basis of the marked mobility that characterizes enarthrosis.
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