Effects of Lower Body Positive Pressure in People With Knee Osteoarthritis

Effects of Retro Walking Exercise Using Lower Body Positive Pressure on Knee Pain and Physical Function in People With Knee Osteoarthritis

The goal of this clinical trial is to compare effects of retro walking exercise versus forward walking using lower body positive pressure on knee pain, physical function, and quadriceps muscle strength in people with mild to moderate knee OA. The secondary aim is to compare effects of retro walking exercise versus forward walking using lower body positive pressure on mobility function, balance, and self-reported health outcomes in people with mild to moderate knee OA. The main questions it aims to answer are: Does retro walking exercise improve knee pain, physical function and Quadriceps muscle strength compared to forward walking exercise using lower body positive pressure in people with mild to moderate knee osteoarthritis? Does retro walking exercise improve Mobility function, balance, and self-reported health outcomes compared to forward walking exercise using lower body positive pressure in people with mild to moderate knee osteoarthritis? Participants will walk (retro versus forward) on a lower body positive pressure treadmill. If there is a comparison group: Researchers will compare [retro walking compares to forward walking] to see if [improve in knee pain, physical function, and quadriceps muscles strength]

Participants will stand on lower body positive pressure treadmill and participate in walking exercise.

The NPRS is an 11-point scale with "0" representing "no pain" and "10" representing "most imaginable pain" used to assess pain intensity.

The KOOS is a self-reported, knee-specific questionnaire that is aimed to measure knee pain, symptoms, and level of disability during the last week.

A Biodex isokinetic dynamometer (Model 4Pro) connected to a computer will be used to assess bilateral knee's flexor and extensor isometric muscle strength.

The FTSST is used to assess lower extremity strength and balance and is an indicator of postural control.

Patients will be instructed to walk backwards when the assessor says "go" and stop when the participant pass the end line colored tape. The participant will be allowed to look back.

The TUG assesses functional mobility by assessing an individual's ability to stand up, walk 3 meters at a comfortable pace, turn 180 degrees, walk back 3 meters, and sit down

FRT used to assess participant's stability and balance by measuring the maximum distance participant can reach forward while standing in fixed position.

It is a health survey that evaluates health related quality of life in a clinical practice and research purpose

RAPA is a 9-items, self-reported questionnaire measures the levels of physical activity of adult older than 50 years.

Inclusion Criteria: Mild to moderate knee osteoarthritis Edge bigger or equal 40 years Knee pain reported by participants in the past 30 days One or both knees osteoarthritis graded with Kellgren & Lawrence grade 1 - 3 Exclusion Criteria: If they didn't meet the inclusion criteria History of hip, knee or ankle injury or surgery within the last year Kellgren & Lawrence grade > 3 of severe knee OA Diagnosed with rheumatoid arthritis History of knee injection with any medicine that reduce pain within the last year History of other medical condition that would disturb normal walking function Receive physical therapy in the last three months Pregnant Other conditions that are Contra indication to lower body positive pressure.