Exercising a stiff knee can help loosen up the joint and the muscles around the joint. These exercises should help relieve a stiff knee.
Starting off with isometric exercises is a great way to activate the muscles, but not make big movements that might be difficult or painful to do.
Once they start to loosen up, bridges seated hip flexion, and seated knee extension (LAQ) will start to progress the movements going through the full range.
Finally, standing exercises will make it a little more challenging, and they will help get rid of the stiffness. Standing hamstring curls, standing hip flexion/extension, standing hip abduction/adduction, and squats with a chair will help get the knee moving.
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