Comparison Between the Effect of Infiltration Between the Popliteal Artery and Capsule of the Knee Block Versus Selective Tibial Nerve Block for Postoperative Analgesia in Patient Undergoing Total Knee Arthroplasty.

Inclusion Criteria:

• Patients with osteoarthritis scheduled for a primary either partial or total knee arthroplasty • Patients aged 40-80 years with a body mass index of 18-36 kg/ m2 and an American Society of Anesthesiologists functional status of I-III Planned use of regional anesthesia

Exclusion Criteria:

• • Patients younger than 40 years old and older than 80years.

  • Hepatic or renal insufficiency.
  • Patients undergoing general anesthesia.
  • Allergy or intolerance to one of the study medications.
  • BMI > 36
  • Diabetes
  • ASA of IV
  • Chronic opioid use (taking opioids for longer than 3 months, or daily oral morphine equivalent of >5mg/day for one month)