Changes in postural control in patients with Parkinson's disease: a posturographic study

Area of Science:

• Neuroscience
• Biomedical Engineering
• Clinical Neurology

Background:

• Postural instability is a significant disabling symptom in Parkinson's disease (PD), frequently leading to falls and reduced mobility.
• Assessing postural control is crucial for understanding functional decline in PD patients.

Purpose of the Study:

• To analyze the limit of stability (LOS) in Parkinson's disease (PD) patients and healthy controls.
• To investigate the influence of visual, somatosensory, and visual-vestibular information on postural control in PD.

Main Methods:

• A cross-sectional study involving 41 PD patients and 41 healthy subjects matched for age and sex.
• Posturography utilizing virtual reality assessed LOS, body sway, and balance functional reserve under 10 different sensory conditions.
• Standard clinical measures included the Unified Parkinson's Disease Rating Scale (UPDRS) and Dynamic Gait Index (DGI).

Main Results:

• PD patients demonstrated significantly lower LOS area and balance functional reserve compared to healthy controls.
• Increased body sway area was observed in PD patients across all tested posturographic conditions.
• A significant association was found between reduced postural control and a major risk of falls.

Conclusions:

• Parkinson's disease patients exhibit impaired postural control, characterized by reduced limit of stability and increased postural sway.
• Sensory manipulation significantly impacts postural control in PD, highlighting the complex interplay of sensory systems.
• The findings underscore the critical link between objective measures of postural instability and fall risk in Parkinson's disease.