Group A Will receive WBV Training with frequency of 35 Hz, peak-to-peak amplitude of 4- to 6-mm Vertical sinusoidal vibration, and the total exposure time of 30 minutes (vibration 60 seconds, interval rest 60 seconds) in addition to traditional exercises,3 sessions per week for four weeks.

Group B will receive Biobex training, Total time of training was 10 minutes each set is 3 minutes with 20-second rest intervals in addition to traditional exercises,3 sessions per week for four weeks.

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Group C Patients will receive only traditional exercises, 3 sessions per week for four weeks. a good general guideline is 2-3 sets of 10-15 repetitions for each exercise.

Sixty Subjects of both genders aged 40-60 years old with grade 2 knee osteoarthritis years will diagnosed by orthopedists they will assigned randomly into three groups:

• Group A Will receive WBV Training with frequency of 35 Hz, peak-to-peak amplitude of 4- to 6-mm Vertical sinusoidal vibration, and the total exposure time of 30 minutes (vibration 60 seconds, interval rest 60 seconds) in addition to traditional exercises,3 sessions per week for four weeks. , A vibration device (My7™ model Personal Plate, Power Plate, Northbrook, IL, USA) will used in all WBVT sessions.
• Group B will receive Biobex training and traditional exercises Total time of training was 10 minutes each set is 3 minutes with 20-second rest intervals
• Group C Patients will receive only traditional exercises, 3 sessions per week for four weeks. a good general guideline is 2-3 sets of 10-15 repetitions for each exercise.

Pain intensity will be measured by visual analogue scale (VAS).

static balance will be measured by Postural stability test by Biodex balance SD.

Dynamic balance will be measured by Limit of stability Test by biodex balance SD.

Functional abilities will be measured by Arabic- language version of knee injury and osteoarthritis outcome score physical function short form (KOOS-PS).