The hip pain causes leg and kne pin . the rght side weaker than the left. Pain is constant, nothhing makes it feel better. prolonged and intense activitity heighten the pain, walking up and down stairs difficule, w/o railing for asssistance instability in left and right extrementities is present. No x-rays etc ave been done. Why are my hips weAK. DIAGNOSIS: LUPUS, CONNECTIVE MUSCELE AND TISSUE DISESASE, FIBROMYALGIA , MILD ARTHRITIS IN MY BACK.