AskDefine | Define flexion

Dictionary Definition



1 the state of being flexed (as of a joint) [syn: flexure, flection]
2 deviation from a straight or normal course [syn: inflection, flection]
3 act of bending a joint; especially a joint between the bones of a limb so that the angle between them is decreased [syn: flexure] [ant: extension]

User Contributed Dictionary



From th flexio.



  1. The act of bending a joint, esp. a bone joint. The counteraction of extension.
  2. alternative spelling of flection

Extensive Definition

In anatomy, flexion is a position that is made possible by the joint angle decreasing. This word has been popularized by the likes of Leslie Bender and her "Bender Ball" infomercial. The skeletal (bones, cartilage, and ligaments) and muscular (muscles and tendons) systems work together to move the joint into a "flexed" position. For example the elbow is flexed when the hand is brought closer to the shoulder. The trunk may be flexed toward the legs or the neck to the chest.
The opposite term is extension, or straightening. Flexion decreases the angle between the bones of the limb at a joint, and extension increases it.
Note that specific flexion activities may occur only along the sagittal plane, i.e. from the forward to backward direction, and not side-to-side direction, which is further discussed in abduction.


Active range of motion exercises include movements such as flexion and extension. These exercises are used after an injury or surgery. They are done by a physical therapist or nurse initially, and may be continued by the patient.
In the healing process, active range of motion exercises, should avoid forcing the appendage into the extension or flexion position. The stress induced may re-injure the affected appendage (limb).

Lower limb

See also

Additional images

Image:Arm_flex_pronate.jpg|An example of an arm flexed in the pronated position; with the biceps partially contracted. Image:Arm_flex_supinate.jpg|An example of an arm flexed in a supinated position with the biceps fully contracted.


External links

flexion in Catalan: Flexió (anatomia)
flexion in German: Flexion (Medizin)
flexion in Spanish: Flexión (anatomía)
flexion in Dutch: Flexie (anatomie)
flexion in Swedish: Flexion
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