Aim for the work is the studying of the existence and pattern of gait impairment in pre-dementia and dementia To examine the association between dual decline in gait and cognition

Dementia is a syndrome usually chronic,characterised by progressive global deterioration in intellect, including memory,learning,orientation,comprehension,judgment,gait, and balance

Gait and balance are the product of successful integration of various posture control mechanisms and locomotion.

There are two basic phases in the full cycle of the step Stance phase Swing phase Slow gait speeds are associated with both cognitive decline and greater risk of dementia So, our aim of this work is to study the existence and pattern of gait balance impairment in patients with different types of dementia and comparison with healthy elderly people.

Inclusion Criteria:

• patients with pre-dementia,dementia, and dementia diagnosed according to The Vascular Behaviour and Cognitive Disorder (VASCOG) and on medication Criteria attending Assiut University neurology outpatient clinic and internal department

Exclusion Criteria:

• 1 history of clinic manfist cerebrovascular stroke 2 definitely laterization sign 3 severe cognitive imparment MOCA 4 Spinal or orthopaedic problems 5 long-term use or abuse of medication affect cognition or balance 6 clinical evidence of peripheral neuropathy

Patients aged 30 to 80 yrs old diagnosed with pre-dementia and/or dementia according to the Vascular Behavior and Cognitive Disorder (VASCOG) who are able to perform gait analysis tests