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Thanks for contacting with your health concern
1. as you are a diagnosed case of MS [multiple sclerosis] which is a disorder of the nervous system thus remain under regular supervision of
Neurologist, since he can determine the best management strategy for your course of the disease.
2. Keeping in mind your Age [65] and symptoms, you should Consult an Orthopedic surgeon [or for a second opinion] regarding hip discomfort/pain since it could be because of
hip osteoarthritis , AVN [avascular necrosis], DVT [deep vein thrombosis], PVD [peripheral vascular disorder]
PS. Another major factor to exclude at your AGE is
Osteoporosis [Age + Pain], so check with your serum Calcium and BMD [bone mineral density] test.
3.till you get an appointment, best which you can do is to slightly change your lifestyle: i.e. avoidance of poor posture, limitation of excess joint loading, use of the walking stick, avoid sitting on floor & climbing stairs as far as possible, use the commode.
PS. The symptoms have to be carefully assessed by your doctor to ensure that whether it requires immediate medical attention or long-term therapy and also the choice of surgery or
hip replacement will depend upon the further stage/ substage so consultation with an Orthopedic Surgeon is highly recommended.