Adequate pain control after total hip arthroplasty is crucial for early ambulation and patient satisfaction. However, there is no consensus about optimal pain control after post operation. In general, the periarticular multimodal durg injection block has been done for pain control in primary total hip arthroplasty. The pericapsular nerve group (PENG) block has been recently introduced a new technique for blockade of the articular branches of the femoral, obturator and accessory obturator nerves. PENG block is possible to provide sufficient analgesia and preserve lower limb muscle strength. The investigators will compare PENG and PMDI block with isolated PMDI block in patients undergoing total hip arthroplasty.

Inclusion Criteria:

1. Patients aged 19 years old or older, with American Society of Anesthesiologists Physical Status 1-3, and scheduled for elective unilateral total hip arthroplasty

Exclusion Criteria:

1. Allergy or intolerance to any of the drugs used in the study
2. Hepatic or renal insufficiency
3. Opioid dependency
4. Coagulopathy
5. Pre-existing neurologic or anatomic deficits in the lower extremities
6. Severe psychiatric illness