Pendular Knee Jerk reflex

Pendular knee jerk reflex or pendular knee reflex
: a rare feature seen in cerebellar disorders.

Significance:
In diseases of the cerebellum, the reflexes may be diminished and pendular.

How to elicit ?

Eliciting the patellar reflex while the foot is hanging free may elicit a series of to-and-fro pendular movements of the foot and leg before the limb finally comes to rest.

Mechanism:
The increased swinging may result from hypotonia of the extensor and flexor muscles and a lack of the restraining influence they normally exert on each other.

The pendular response may also be observed in chorea, but there is more frequently a “hung” reflex.


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