What does the knee reflex test for?

What does the knee reflex test for?

The patellar reflex test is performed to determine the integrity of the neurological function, which is accomplished by hitting the patellar tendon below the knee cap with a test hammer [2].

What does tapping the knee do?

The tap below the knee causes the thigh muscle to stretch. Information is then sent to the spinal cord. After one synapse in the ventral horn of the spinal cord, the information is sent back out to the thigh muscle that then contracts.

What does it mean when you have no reflexes in your knees?

The normal response is a ‘knee jerk’. This is an example of a reflex, which is an involuntary muscular response elicited by the rubber hammer tapping the associated tendon. When reflex responses are absent this could be a clue that the spinal cord, nerve root, peripheral nerve, or muscle has been damaged.

Is knee-jerk a natural reflex action?

Reflexes are involuntary actions which are quick and automatic and brought about by a stimulus. Reflexes can be inborn or natural e.g. knee-jerk, withdrawal of hand or leg when they come into contact with hot or sharp objects etc. Conditioned reflexes are those that we develop in our lifetime due to learning.

Does the knee-jerk reflex involve the brain?

Doctors will test reflexes by tapping the tendon just below the knee, and this causes the leg to kick out. This knee-jerk reflex is an example of a simple monosynaptic reflex. This quick response is called a reflex, and reflexes occur without conscious thinking or planning, meaning the brain is not involved in them.

Which reflex is most difficult to test?

If you cannot get any response with a specific reflex—ankle jerks are usually the most difficult—then try the following: Several different positions of the limb. Get the patient to put slight tension on the muscle being tested.

What stimulates tendon reflexes?

Examining reflexes Tendon reflexes are single synapse reflexes. A rapid stretch of the muscle stimulates the muscle spindles and this message is conveyed via the sensory root to the spinal cord at the segmental level of the muscle stimulated.

What is normal deep tendon reflexes?

Deep tendon reflexes are normal if they are 1+, 2+, or 3+ unless they are asymmetric or there is a dramatic difference between the arms and the legs. Reflexes rated as 0, 4+, or 5+ are usually considered abnormal.

What is a normal knee reflex?

Knee reflex: (L2-L4) Slightly lift up the leg under the knee, and tap the patellar tendon with a reflex hammer. There should be a reflex contraction of the quadriceps muscle (knee extension). (If performed in a sitting position, have the legs dangle over the edge of the chair or table).

What is the check reflex?

follows: “When a person attempts to execute a. movement against resistance with a normal. limb, and the resistance is suddenly removed, the limb rapidly moves a short distance in the. desired direction till abruptly checked, or it.

Where are deep tendon reflexes?

There are five primary deep tendon reflexes: bicep, brachioradialis, triceps, patellar, and ankle.

How do you test for the Brachioradialis reflex?

The brachioradialis reflex is observed by striking the brachioradialis tendon directly with the hammer when the patient’s arm is resting. Strike the tendon roughly 3 inches above the wrist. Note the reflex supination. Repeat and compare to the other arm.


Andrey is a coach, sports writer and editor. He is mainly involved in weightlifting. He also edits and writes articles for the IronSet blog where he shares his experiences. Andrey knows everything from warm-up to hard workout.