Syndesmoses

A type of fibrous joint that connects bones through a band of dense connective tissue.

Syndesmoses are specific joints classified as fibrous joints, where two bones are connected by a ligament or an interosseous membrane, allowing for minimal movement. Unlike other joints, syndesmoses do not have a synovial cavity; instead, they are held together tightly by fibrous tissue. These joints are found in locations where a more substantial connection is necessary while still allowing slight movement.

Terminologia Anatomica

syndesmosis

System

Skeletal system

Function

The primary function of syndesmoses is to provide stability between two bones while allowing a small degree of movement, which is crucial in certain areas of the body. This slight movement enables flexibility and adaptability of the skeletal system, especially during activities such as walking or running, where the bones need to shift slightly relative to one another. An example is the distal joint between the fibula and tibia, where the syndesmotic ligament allows for slight movement necessary for proper gait. This joint also plays a key role in absorbing stress and distributing loads across bones, minimizing the risk of fractures and injuries. The intricate arrangement of fibers in these joints can enhance proprioception, allowing the body to perceive the position and movement of the bones, which is vital for coordinated movement and balance.

Location

Syndesmoses are located in various regions of the body, with two notable examples being the joint between the tibia and fibula, called the tibiofibular joint, located in the lower leg, and the interosseous membrane connecting the radius and ulna in the forearm. These structures exist where the need for stability and slight movement coexist. In the forearm, the interosseous membrane allows for rotational movement necessary for activities such as turning a doorknob, while in the lower leg, it provides stability during weight-bearing activities. The placement of syndesmoses at these junctions highlights their role in maintaining structural integrity while accommodating the natural range of motion required for everyday activities.

Did You Know?

The tibiofibular syndesmosis is critical in sports medicine, as injuries in this area can lead to severe impairment.
Syndesmoses are classified as 'amphiarthrotic' joints, meaning they permit slight movement, distinguishing them from more rigid joints like sutures.
The term 'syndesmosis' is derived from the Greek word 'syndesmos,' which means ligament, emphasizing the importance of ligaments in this type of joint.