hi sir/mam, my mother is 62 years old. she is suffering from numbness and pain in her left lower limb. her right lower limb(specially knee) is swelling and this is happening since last 2 years. she is also taking medicine for blood pressure since last 10 years. her recent medical report is as-

1.     Degenerative changes with reduced I.V disc space between L5/S1.
2.     
Test Result reference range unit
3.     ALBUMIN [Serum]           3.9                3.5-5.5                          g/dL
Method : Bromo Cresol Purple…………………………………………………………………..
3. CREATININE [Serum] 0.71 0.5-1.2 mg/dL
     Method : Alkaline Picrate-Kinetic
4. Thyroid Stimulating Hormone(TSH) 0.02 0.34-4.25 µ IU/mL
[Serum] Method : chemiluminescence


Urine(Routine and Miroscopy)
Physical Examination

Amount……………………….25ml Reference Range
Colour………………………..Yellow
Appearance……………………clear clear
PH…………………………….Acidic 4.6-8.0
Specific gravity* 1.015-1.025

Microscopic Examination(centrifuged deposite)
W.B.Cs……………….Occasional……………….Epithelial cells……….Occasional………………..3-5 cells high power field
R.B.C.S………………….. nil……………………Casts………………………… nil/low power field
Crystals…………………………… nil/low power field
Bacteria………………………
Others………………………… nil/low power field

Chemical Examination
Albumin nil………………………..nil
Sugar nil………………………..nil
Acetone*………………………………………….nil
Bile Salt*………………………………………….nil
Bile Pigment*……………………………………..nil
Urobilinogen*……………………………………..0 - 1+
Blood*…………………………………………….nil
Bence Jones Protein*………………………………nil

please tell me the problem with possible cause and its best solution.