Effect of Proximal Stabilization on Recruitment of the Core & Vasti in Patients With Patellofemoral Arthritis as They Descend Stairs

: A) Procedures for evaluation: The practical section of the studywill be undertaken in 6 weeks (2 sessions a week). Measurement will be taken before the start of treatment program then after the end of 6 weeks treatment program. Investigators will collect the EMG activity of VMO, VL, GM, multifidus, and TrA using bipolar Ag-AgCl disposable surface electrodes (Better signal solution medical supply Co., limited, Zhongshan, China) and eight channels highresolution wireless bio amplifier (WBA) system (Biomation, Almonte, Canada). Electromyographic data will be sampled at 1000 Hz and bandpass filtered at 50-200 Hz. For each muscle, three electrodes will be used; two electrodes will be placed ~ 30 mm apart in the direction of the muscle fibers and a ground electrode will be placed over the closest bony prominence. Before placement of the electrodes, the subject's skin will be cleaned with alcohol to reduce impedance and excess hair will be removed to eliminate shifting of the electrodes if needed. The stairstepping task will consist of descending 2 steps Before data acquisition, participants will be asked to perform one practice trial of stair descent to get familiarized with the task. Then the participants will perform three test trials with thirty seconds of rest after each trial to prevent fatigue. The raw data will be stored on a personal computer for analysis with a custom program in Matlab . Investigators will use a mean of data in three trials for analysis.

b) Procedures for treatment: All patients will receive a traditional physical therapy program in the form of TENS , stretching hamstring, quadriceps and calf muscles

• Group (A) Patients in this group will receive a traditional therapeutic knee rehabilitation program in the form of mini-squatting exercise (up to 45 degrees knee flexion measured by a universal goniometer) , strengthening of hip abductors and external rotators using clamshell exercise . No emphasis will be placed on stabilizing the core musculature before initiating any of those exercises.
• Group (B) Patients in this group will receive the same program as group (A) plus proximal stability exercise and the principles of proximal stability will be explained to patients before initiation of treatment and patients will be asked to comply with these principles during exercise. These principles include learning how to activate transversus abdominus by abdominal bracing without allowing pelvis tilting and ensure neutral spine and diaphragmatic breathing during exercise.