Probably there is spinal cord compression
due to tubercular pathology of the spine and early decompression may be indicated.Sometimes it takes almost 2-3 months for pathology to reduce and thus swelling near nerve
tissues gradually subside with rest, immobilization,drugs- all reduce surrounding inflammation. But in case, the muscle power goes on decreasing in the lower limbs
,your doctor must evaluate neurological power grade and if found decreasing despite rest, immobilization,and drugs taken over 2 months he should certainly try to decompress the area by surgical intervention.You may seek help from spine surgeons,neurosurgeons immediately for second opinion
and evaluation and if they advise for surgery must go for it.