Orthopedic anaesthesia and acute postoperative pain management, two anesthesiology subspecialties,are getting more credit for reducing hospital stays, promoting functional recovery and improving patient satisfaction.

Inclusion Criteria:

-The study will include 100 adult patients (18 to 50 years old) with ASA physical status class I and class II undergoing orthopedic lower limb surgeries under itrathecal anathesia .

Exclusion Criteria:

• Patient refusal.
• Drug abuse.
• Patient with neurological, psychiatric or neuromuscular disease.
• Chronic pain on medicine.
• Known allergy to the study medications.
• Patients e contraindications to intrathecal anesthesia .