Safety and Efficacy of Omitting Intrathecal Morphine Combined with Ultrasound-Guided Saphenous Nerve Block for Postoperative Analgesia in Total Knee Arthroplasty: A Prospective Comparative Study at Phra Nakhon Si Ayutthaya Hospital

Authors

  • Paksiree Changkittirat Anesthesiologist, Phra Nakhon Si Ayutthaya Hospital
  • Pitsamai Ruenthana Anesthesiology Nursing Division, Phra NaKhon Si Ayutthaya Hospital
  • Sukanya Pinhom Nursing Research and Development Department, Phra NaKhon Si Ayutthaya Hospital

Keywords:

intrathecal morphine, saphenous nerve block, total knee arthroplasty, postoperative nausea and vomiting, postoperative analgesia

Abstract

Objectives: Postoperative pain following total knee arthroplasty (TKA) is commonly managed with intrathecal morphine (ITM) combined with spinal anesthesia to enhance analgesic efficacy. However, ITM is associated with opioid-related side effects such as postoperative nausea and vomiting (PONV) and pruritus. This study aimed to compare the safety and efficacy of omitting ITM combined with ultrasound-guided adductor canal block versus the use of ITM in patients undergoing TKA. Methods: This prospective controlled clinical study included 60 patients undergoing TKA. Participants were divided into a control group receiving ITM (n = 30) and an experimental group without ITM (n = 30). All patients received spinal anesthesia combined with an ultrasound-guided adductor canal block. Outcomes included the incidence of PONV, pruritus, pain scores, time to first pain, and time to ambulation. Data were analyzed using Chi-square test, Fisher’s exact test, and Mann–Whitney U test, with statistical significance set at p < 0.05. Results: The experimental group demonstrated a significantly lower incidence of PONV and pruritus compared with the control group (p < 0.05). In terms of analgesic efficacy, the control group had a longer pain-free period and lower pain scores within the first 6 hours postoperatively (p < 0.05). However, pain scores at 12 and 24 hours were comparable between the two groups. Additionally, the experimental group achieved earlier postoperative ambulation than the control group (p = 0.01). Patient satisfaction was rated at the highest level in both groups, with no significant difference. Conclusion: Omitting intrathecal morphine in combination with adductor canal block reduces opioid-related side effects and enhances postoperative recovery, while maintaining comparable analgesic efficacy in the later postoperative period. This approach may be considered a safe and effective alternative for postoperative pain management in TKA patients.

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Published

2026-08-31

How to Cite

1.
Changkittirat P, Ruenthana P, Pinhom S. Safety and Efficacy of Omitting Intrathecal Morphine Combined with Ultrasound-Guided Saphenous Nerve Block for Postoperative Analgesia in Total Knee Arthroplasty: A Prospective Comparative Study at Phra Nakhon Si Ayutthaya Hospital. JPMAT [internet]. 2026 Aug. 31 [cited 2026 Sep. 3];16(2):393-408. available from: https://he01.tci-thaijo.org/index.php/JPMAT/article/view/288348

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Original Article