Which tendon reflex is most commonly demonstrated in newborns?

The patellar reflex, known as the knee-jerk reflex, is the tendon reflex that is most commonly demonstrated in newborns. This reflex is an essential part of the neurological assessment in infants, as it shows the functionality of the nervous system and the integrity of the spinal pathways.

In newborns, the patellar reflex is commonly elicited by tapping the patellar tendon with a reflex hammer, resulting in an involuntary extension of the knee. The presence of this reflex indicates that the infant's nervous system is developing appropriately, with intact pathways between the knee and the spinal cord.

While other reflexes such as the biceps, triceps, and Achilles can also be assessed in newborns, the patellar reflex is particularly prominent and easier to elicit during routine examinations. Therefore, recognizing the presence of the patellar reflex helps healthcare providers ensure that the newborn's neurological development is on track.