Low impact exercises are the best for building glute strength which in turn takes pressure out of your knees.
For this exercise you are going to start in table top position, on your hands and knees. Kick one leg straight back, and keep your toe on the ground. Without moving your hips, shoulders, or throwing your body into the movement, squeeze your glute to lift your leg straight back into the air.
Your goal is to squeeze, lift, and repeat. Starting out, I would do 3-5 sets of 15-20 reps. This movement is simple but effective. Focus on always squeezing from your glute and keeping your hips and shoulders square.
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