hi, as you mentioned you had a hip replacement surgery and facing the lymohedema in hip this is nothing to worry much. it is just a venous drainage which has to be corrected. So for this you need to do some simple hip exercises. Also at times the weakness of muscles is seen as edema but it is not true edema. I will advice you to keep the leg elevated over a pillow when you are lying flat on your back. this will help drain the lymphatics. Try performing slow static exercises for the hip muscles and thigh muscles under a physical therapist as due to lack of knowledge one may have a chance to dislocate the hip again. And safety is a must in any case. you can discuss the same with your Surgeon about the physical therapy. usually with physical therapy post operative cases recover faster and better. with the grace of God I wish you a speedy recovery regards.