Severe pain from Hip to down the leg

My wife is 47, she is having severe pain from hip to leg and the local Indian Doctor had suggested MRI scan and the report is given below below. Dr. given medicine and being continued for more than 6 months. No cure. Need your kind suggestion for, which specialist to consult and how severe is it.

Thanks.

Arup Samanta
India
-------------------------------MRI Scan report----------------

PART SCANNED-LUMBO SACRAL SPINE
SCAN PROTOCOL-NON CONTRAST T1 AND T2W SPIN ECHO SEQUENCES IN SAGITTAL,  AXIAL AND CORONAL PLANES WITH STIR SEQUENCE IN SAGITTAL PLANE.
SCOLIOSIS OF LUMBAR SPINE WITH CONVEXITY TO LEFT IS SEEN

THE LUMBAR DISCS R DESSICATED APPEARING HYPOINTENSE IN T2WI

THE L4 DISC SHOWS MILD LEFT POSTEROLATERAL PROTRUSION CAUSING MILD CENTRAL CANAL COMPROMISE  AND LEFT NEUTRAL FORAMINAL NARROWING WITH RESULTANT COMPRESSION OF THECAL SAC AND LEFT L5 NERVE ROOT.

THE L2-3,L3-4 AND L5-S1 DISCS SHOW MILD POSTERIOR BULGES INDENTING THECAL SAC BUT NOT CAUSING REMARKABLE SPINAL OR NEURAL FORAMINAL STENOSIS

THE EFFECTIVE MID SAGITTAL DIAMETER OF SPINAL CANAL AT VARIOUS DISC LEVELS ARE AS FOLLOWS

L1-L2         L2-L3      L3-L4          L4-L5           L5-S1
16.0mm     14.0mm    12.5mm    11.0mm     11.5mm

there are hypertrophy of ligamentum flava of L4-5 LVEL PARTLY CONTRIBUTING THE SPINAL CANAL STENOSIS.
THE FACET JOINTS AND LIGAMENTUM FLAVA ARE NORMAL AT OTHER LEVEL.
THE VISIBLE SPINAL CORD IS NORMAL.
NO ABNORMAL PERIVERTEBRAL SOFT TISSUE NOTED.

IMPRESSION---MILD LEFT POSTEROLATEREL PROTRUSION OF L4-5 DISC CAUSING MILD CENTRAL CANAL COMPROMISE AND LEFT NEURAL FORAMINAL NARROWING WITH RESULTANT COMPRESSUON OF THECAL SAC AND LEFT L5 NERVE ROOT.