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Published in: International Orthopaedics 12/2020

01-12-2020 | Analgesics in Dentistry | Original Paper

Effects of morphine on peri-articular infiltration analgesia in total knee arthroplasty: a prospective, double-blind, randomized controlled trial

Authors: Qiuru Wang, Jikui Sun, Yunlian Hu, Yan Zeng, Jian Hu, Jing Yang, Pengde Kang

Published in: International Orthopaedics | Issue 12/2020

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Abstract

Purpose

Peri-articular infiltration analgesia (PIA) is a widely used method to control post-operative pain in total knee arthroplasty (TKA) patients. However, there are limited data that support the use of morphine in PIA. This study aims to evaluate the efficacy of peri-articular morphine infiltration for pain management in TKA patients.

Methods

Based on a double-blind, randomized approach, patients were allocated to the morphine or control group. Patients in the morphine group received a peri-articular infiltration of an analgesic cocktail consisting of ropivacaine, epinephrine, and morphine. Morphine was omitted from the cocktail in the control group. Primary outcomes were post-operative consumption of morphine hydrochloride used for rescue analgesia and post-operative pain as assessed by visual analog scale (VAS) score. Secondary outcomes were functional recovery as assessed by a range of knee motion, quadriceps strength, and daily ambulation distance. The duration of hospital stay was also recorded. Tertiary outcomes included the occurrence of post-operative adverse effects and the consumption of antiemetics.

Results

Patients in the morphine group had significantly lower post-operative morphine consumption in the first 24 h and total morphine consumption. There was no significant difference between the two groups in post-operative VAS pain scores at rest or during motion. There was no significant difference between the two groups in the post-operative knee range of motion, quadriceps strength, daily ambulation distance, or duration of post-operative hospital stay. The two groups were similar in the incidence of adverse effects and the consumption of antiemetics.

Conclusion

Adding morphine into the analgesic cocktail of PIA could reduce postoperative morphine consumption in TKA patients, but does not improve early pain relief or accelerate functional recovery or provide clinical benefits for TKA patients. In addition, the complications and safety of peri-articular morphine infiltration need to be further investigated in larger sample studies.
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Metadata
Title
Effects of morphine on peri-articular infiltration analgesia in total knee arthroplasty: a prospective, double-blind, randomized controlled trial
Authors
Qiuru Wang
Jikui Sun
Yunlian Hu
Yan Zeng
Jian Hu
Jing Yang
Pengde Kang
Publication date
01-12-2020
Publisher
Springer Berlin Heidelberg
Published in
International Orthopaedics / Issue 12/2020
Print ISSN: 0341-2695
Electronic ISSN: 1432-5195
DOI
https://doi.org/10.1007/s00264-020-04700-z

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