Hello,
With history, it appears the pain is localized in the T12 region. That is the junction which gets more
muscle weakness due to abnormal posture.
During the time having weak muscles any exercise done for the lower
limbs will provide a strain there.
As this is the biomechanics of the spine. Leg goes up and spine goes down.
If any weakness present there will be inflammation.
Also, while sitting in the wrong posture, usually the relaxed position where the spine bends forward there will be over stretching of the paraspinal muscles which over a period of time goes weak and any strain applied to lower limb exercises will lead to pain there.
As the X-ray turned out to be normal I do not suspect any kind of
bone fracture there. If it was a fracture the symptoms would have been different.
Now there is burning sensation which is radiating in nature taking an
MRI will be on a safer side to know any
soft tissue injury.
Now coming to the stabilizing part of the spinal column. Why don't you try doing spinal extension and core stability exercise initially. Using ice packs over the painful area will reduce the pain as well.
Having good stability of the spine will consist of the stability and strength of the para spinal muscles along with the posture correction will help with great benefits.
In my clinical practice of over 12 years, most cases have been reported with the same complaints.
Having doing correction of posture and core stability exercises have provided good outcome score. Will recommend you the same.
Hope I have answered your query. Let me know if I can assist you further.
Take care
Regards,
Jay Indravadan Patel, Physical Therapist or Physiotherapist