Sensory ataxia is a spinal ataxia. It is caused by deep sensory deficits caused by damage to the posterior roots of the spinal cord. Vision can be compensated, so Romberg’s sign is positive and the heel-knee-shin test is unstable, along with impaired position and vibration perception of the lower extremities. It is seen in spinal cord lesions, peripheral neurotic mass, and Friedreich’s disorder. What causes sensory ataxia? Degenerative, secondary atrophy of nerve cells and posterior root fibers in the spine can cause this disease. The disease is autosomal recessive, and its onset begins in early childhood or adolescence and worsens with age. How is physical examination performed in sensory ataxia? The symptoms include slow walking, splayed legs, swaying from side to side, staggering like drunkenness, positive heel-knee-shin test, diminished or absent deep sensation of both lower limbs and knee and Achilles tendon reflexes. Positive babinski sign on both sides. It often causes severe scoliosis or kyphosis and bowed feet. In the late stage, there are varying degrees of paralysis and bladder and rectal dysfunction.