-This study would answer the following question: Is there an effect of kinetic control retraining on electromyographic activity of trunk and lumbar proprioception in patients with lumbosacral radiculopathy?

The aims of this study are:

1. To investigate the effect of kinetic control retraining on electromyographic activity of trunk in patients with lumbosacral radiculopathy
2. To investigate the effect of kinetic control retraining on lumbar proprioception in patients with lumbosacral radiculopathy.
3. To investigate the effect of kinetic control retraining on trunk Range of motion (ROM) in patients with lumbosacral radiculopathy.
4. To investigate the effect of kinetic control retraining on pain intensity in patients with lumbosacral radiculopathy. 5 -To investigate the effect of kinetic control retraining on functional disability in patients with lumbosacral radiculopathy.

Inclusion Criteria:

1. Patients will be from both sexes.
2. The age of patients will range from 35- 50 years old.
3. The Body Mass Index (BMI) of patients will be less than 30Kg/m2
4. All patients represent chronic low back pain (at least 3 months).
5. Patients with unilateral lumbosacral radiculopathy (L4-5, L5-S1) due to Posterolateral disc prolapse.
6. Patients have been diagnosed by MRI.
7. Patients with sufficient cognitive abilities that enables them to understand and follow instructions (Mini-Mental State Examination (MMSE) scale >24).

Exclusion Criteria:

1. Previous spinal surgeries
2. Another Causes of the lumbosacral radiculopathy
3. Pain that persists less than 3 months
4. Spinal tumors
5. Lumbar instability due to structural problems, for example: ligament tear or spondylolythesis.
6. Cognitive impairment (a score less than 24 according to MMSE).