The patients will be treated with superficial heating, transcutaneous electrical nerve stimulation, exercise therapy and therapeutic ultrasound over the paravertebral low back region.

The patients will be treated with superficial heating, transcutaneous electrical nerve stimulation, exercise therapy over the paravertebral low back region.Therapeutic ultrasound will not be applied to this group.

The physiotherapy modalities will be applied for five sessions a week for 3 weeks.

The all patients will be treated with superficial heating (the moist heat pack will be applied to the patient's lower back for 20 minutes) , transcutaneous electrical nerve stimulation(frequency of 100 Hz, pulse duration of 100 μs, sensory-level amplitude was applied for 25 minutes) , exercise therapy (consisting of flexion, extension, stretching, mobilisation, and postural exercises performed for approximately 25 minutes ) .

In addition to these therapies, continuous therapeutic ultrasound treatment will be applied to patients in first group for 10 minutes; frequency of 1 megahertz, intensity of 1.5 W/cm2, effective irradiation area of the transducer head 5 cm2 .

To measure the serum creatinine levels, 5 mL of venous blood will be collected in a tube containing a gel separator and clot activator in the morning after a 12-hour fast. Serum creatinine will be measured in an autoanalyser.

After the first urine sample of the first day was discarded, 24-hour urine samples will be collected, including the first of the next day. The 24-hour urine samples will be analysed on the day of collection, and will be analysed using colorimetric method in an autoanalyser.

Creatinine clearance will be calculated with the following formula:

Urine creatinine (mg/dL) × urine volume (mL)/serum creatinine (mg/dL) × 1440.

Glomerular filtration rate will be as calculated using the Modification of Diet in Renal Disease formula. (GFR (mL/min/1.73 m²) = 175 × (Scr)-1.154 × (Age)-0.203 × (0.742 if female) × (1.212 if African American)

To measure the cystatin-C levels, 5 mL of venous blood will be collected in a tube containing a gel separator and clot activator in the morning after a 12-hour fast. Serum cystatin C will be determined using a sandwich enzyme immunoassay kit.

After the first urine sample of the first day was discarded, 24-hour urine samples will be collected, including the first of the next day. The 24-hour urine samples will be analysed on the day of collection, and will be analysed using immunoturbidimetric method in an autoanalyser.