Description

**⑧-1. Visit 0: Pre-surgery Admission, Orthopedic Ward (Consent Acquisition and Screening)** According to the investigator's judgment, patients who are considered potential candidates will be encouraged to participate in the clinical trial. One day (±1 day) before surgery, the investigator or designated study staff will thoroughly explain the clinical trial process to the participant and their guardian (representative) based on the informed consent form and provide the form so that all participants and their guardians have sufficient time to read, discuss, and decide. Participants who agree to participate in the clinical trial will voluntarily sign the written consent form and receive a copy of the signed consent form before any study-related procedures are conducted. The clinical trial site will assign a screening number to patients who voluntarily provide consent and undergo screening. The screening number can be assigned in the order in which the participants sign the consent within the study site. After confirming eligibility based on inclusion/exclusion criteria, randomization will be performed to assign participants to either the treatment group or the control group (with a 1:1 ratio). If assigned to the treatment group, participants will receive 'Polmacoxib (preventive Acelex cap 2mg) once daily,' and NSAIDs-excluded non-opioid/opioid analgesics - PRN. If assigned to the control group, participants will receive NSAIDs-excluded non-opioid or opioid analgesics. Data will be collected by comparing the two groups in a double-arm setup. Pain scores, UCLA/ASES scores, and joint range of motion will be collected, and this data will be valid up to 3 months before the surgery.

**Visit 0 Investigations and Examinations:**

1. Obtain written consent
2. Assign screening number
3. Verify inclusion/exclusion criteria
4. Collect baseline information of the participant
5. Collect baseline disease information
6. Physical examination
7. Imaging data (MRI, X-ray, etc.)
8. UCLA/ASES scores (including pain scores)
9. Joint range of motion
10. Randomization
    • 2. Visit 1: Two Hours Before Surgery, Orthopedic Ward (Medication Administration)** Medication administration begins two hours before surgery.

**Visit 1 Investigations and Examinations:**

1. Medication administration
   • 3. Visit 2: Post-surgery Admission, Orthopedic Ward (Three Days After Surgery)** Collect pain scores and the cumulative number of NSAIDs-excluded non-opioid or opioid analgesic doses (post-surgery) three days after surgery. Non-opioid or opioid analgesics (e.g., Fentanyl injection or Ultracet) will be used to manage post-surgical pain, and the number of doses will be collected to assess the participant's pain.

**Visit 2 Investigations and Examinations:**

1. Pain scores
2. Physical examination
3. Check for adverse events
4. Cumulative number of NSAIDs-excluded non-opioid or opioid analgesic doses (post-surgery)
   • 4. Visit 3: Two Weeks After Surgery (±3 Days), Orthopedic Outpatient Clinic** An outpatient visit will be conducted one week after discharge. Collect pain scores and the cumulative number of NSAIDs-excluded non-opioid or opioid analgesic doses at the two-week mark.

**Visit 3 Investigations and Examinations:**

1. Pain scores
2. Physical examination
3. Check for adverse events
4. Cumulative number of NSAIDs-excluded non-opioid or opioid analgesic doses (cumulative since surgery)
   • 5. Visit 4: Six Weeks After Surgery (±3 Days)** Collect pain scores and the cumulative number of NSAIDs-excluded non-opioid or opioid analgesic doses at the six-week mark.

**Visit 4 Investigations and Examinations:**

1. Pain scores
2. Cumulative number of NSAIDs-excluded non-opioid or opioid analgesic doses (cumulative since surgery)
3. Physical examination
4. Check for adverse events
   • 6. Visit 5: Twelve Weeks After Surgery (±3 Days), Orthopedic Outpatient Clinic** An MRI will be performed to check for re-tears (optional for participants). This visit will be the study's completion visit, during which pain scores, UCLA/ASES scores, joint range of motion, and cumulative doses of NSAIDs-excluded non-opioid or opioid analgesics will be collected. If adverse events occurring during the treatment period have resolved before this completion visit, no additional safety follow-up will be performed, and this visit will be considered the end of the clinical trial. If adverse events have not resolved by the completion visit, follow-up will continue until the adverse events have either returned to pre-study or baseline levels, or the principal investigator or designee determines that the adverse events have stabilized, or no further follow-up is deemed necessary. This follow-up will mark the completion of the clinical trial.