ANATOMY

Detailed explanation-1: -In the limbs, flexion decreases the angle between the bones (bending of the joint), while extension increases the angle and straightens the joint. For the upper limb, all anterior-going motions are flexion and all posterior-going motions are extension.

Detailed explanation-2: -Flexion/Extension The movement at a joint which decreases the angle between two adjacent body segments is know as flexion. The opposite action is extension, where the angle between body segments is increased.

Detailed explanation-3: -Extension – straightening a joint. This occurs when the angle of a joint increases, for example the elbow when throwing a shot put. The take-off knee extends when a high-jumper takes off (the other knee is flexed). Ball and socket joints also allow flexion and extension.

Detailed explanation-4: -Knee flexion/extension angle is defined as the relative angle of the knee between two adjacent segments, as shown in Fig. 1. It is well known that knee flexion/extension angle has clinical importance not only in gait analysis, but also in rehabilitation [6].

Detailed explanation-5: -In the limbs, flexion decreases the angle between the bones (bending of the joints) while extension increases the angle and straightens the joint. All anterior motions or bending at the joint is considered flexion and all posterior motions are extension.