Brief Answer:
you are having sacroillitis
Detailed Answer:
Hello,
I have read your question in detail and I will try to be as simple as possible in my answer. Also you are free to answer any followup question if you think that i missed some thing or you are not getting some points.
So i will start now.
1. Your sacroilliac joint, which is present at lower back, just behind hip is showing some water collection in bone. This means there is some disease activity going on. Although it is very little, so you may not feel direct pain or any pain on pressing on your back but your thigh pain can be due to this fluid.
2.Your thigh muscles are showing fat deposition, that means your thigh muscles are getting weaker and at the place of muscle tissue there is fat. So if you stand for long time, you may feel tired a little.
3.There is
sclerosis at
SI joint means there is some sign of your old AS as well. And i can assure you this does not mean tumor. Whenever above mentioned fluid in joint get dried up it become little sclerotic on MRI. So its kind of change which shows that a healed disease is there.
4.
Hamstring tendinosis is pain and swelling in muscles of back thigh. This can happen during playing any sport, doing yoga and doing any activity which put strain on thigh muscles. .So this explains your deep pain in thigh .
5.Your hip joints are normal, there is no water, or calcium deposition or loss of blood flow in hip joints. They are in very good condition.
6.
Atrophy of tensor XXXXXXX muscles again mean that your thigh muscles are getting weaker.
So if I summaries all MRI finding it means that there is some weakness of your thigh muscles, and there is some fluid in your SI joint. So there is nothing very serious or alarming about it. There is no tumor or any such thing which can become a serious issue in future. These findings are reported even in some normal person as well.
I would like you to suggest that for time being do not do any yoga exercise as it may cause thigh
muscle strain. Take protein in diet like egg, fish, chicken. For pain relief you can take either Amytryptalin and
tramadol after consulting with doctor. Also apply warm water over thigh( you can sit in a tub) when you are taking bath. It will reduce your pain. Taking calcium and vitamin D also makes muscle healthy.
I hope I had answer all your queries. Feel free to question any thing else. Thanks for giving me this opportunity and take care.