Coordination & Gait Exam: Sensory Atatxia, Cerebellar Ataxia, Tremors and Gaits

Overview of the Coordination and Gait Examination

The coordination and gait examination is an essential component of the neurological assessment that evaluates cerebellar function, proprioceptive pathways, and motor integration. Abnormalities in coordination and gait can indicate lesions in the cerebellum, basal ganglia, dorsal columns, vestibular system, or peripheral nerves.

Cerebellar Function Tests

Finger-to-Nose Test

The finger-to-nose test evaluates upper extremity coordination. The patient alternately touches their own nose and the examiner’s finger. Cerebellar lesions produce dysmetria (overshooting or undershooting the target) and intention tremor that worsens as the finger approaches the target.

Heel-to-Shin Test

This test assesses lower extremity coordination. The patient places one heel on the opposite knee and slides it down the shin. Cerebellar dysfunction manifests as an irregular, wavering trajectory. Combined with the sensory system examination, these tests help localize neurological lesions.

Rapid Alternating Movements

Dysdiadochokinesia, the inability to perform rapid alternating movements smoothly, is tested by having the patient rapidly pronate and supinate their hands or tap their fingers. Irregular rhythm and amplitude suggest cerebellar pathology.

Types of Ataxia

Sensory Ataxia

Sensory ataxia results from impaired proprioception due to dorsal column or peripheral nerve damage. It is characterized by a positive Romberg sign (increased unsteadiness with eyes closed) and a high-stepping, stamping gait. Patients rely heavily on visual input to maintain balance.

Cerebellar Ataxia

Cerebellar ataxia produces a wide-based, staggering gait with irregular steps. Unlike sensory ataxia, cerebellar ataxia is not significantly worsened by eye closure. Midline cerebellar lesions affect gait and trunk stability, while lateral cerebellar lesions cause ipsilateral limb ataxia.

Tremors

Tremor classification is important in differential diagnosis. Resting tremors (present at rest, diminished with movement) suggest Parkinson’s disease. Intention tremors (worsening with purposeful movement) indicate cerebellar pathology. Postural tremors (present when maintaining a position) may indicate essential tremor or metabolic causes.

Gait Assessment

Systematic gait observation evaluates stride length, base width, arm swing, posture, and stability. Specific gait patterns aid diagnosis: shuffling gait in parkinsonism, steppage gait in foot drop, and waddling gait in proximal muscle weakness. ConductScience offers behavioral research equipment and clinical assessment tools for gait and coordination research.

References

1. Campbell, W. W. (2013). DeJong’s The Neurologic Examination (7th ed.). Lippincott Williams and Wilkins.
2. Mumenthaler, M., and Mattle, H. (2017). Fundamentals of Neurology (2nd ed.). Thieme.
3. Bickley, L. S. (2016). Bates’ Guide to Physical Examination and History Taking (12th ed.). Wolters Kluwer.