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Published in: BMC Anesthesiology 1/2019

Open Access 01-12-2019 | Analgesics in Dentistry | Research article

Continuous Adductor Canal Block used for postoperative pain relief after medial Unicondylar Knee Arthroplasty: a randomized, double-blind, placebo-controlled trial

Authors: Fei Lan, Yanyan Shen, Yanhui Ma, Guanglei Cao, Nicole Philips, Ting Zhang, Tianlong Wang

Published in: BMC Anesthesiology | Issue 1/2019

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Abstract

Background

Peripheral nerve block and local infiltration analgesia (LIA) provide good analgesia after knee replacement. This study evaluated the additional analgesic efficacy of continuous adductor canal block (ACB) added to single-dose LIA after medial unicondylar knee arthroplasty (UKA). We hypothesized ACB would lower pain scores and facilitate postoperative ambulation.

Methods

Forty-six patients were enrolled into this double-blind, randomized, placebo-controlled trial. UKA was performed and all patients received single-dose LIA intraoperatively. Patients were randomized into two groups: Group RP receiving 0.2% ropivacaine or Group Con receiving normal saline. A flow at 6 mL/h was administered for 48 h through a catheter in the adductor canal. Primary outcome was movement pain score at 24 h using the numeric rating scale (NRS-11). Secondary outcomes included serial postoperative pain scores, rate of patients with NRS>3 at rest and movement within 24 and 48 h postoperatively, time to breakthrough pain, quadriceps motor strength, ambulated distance, catheter related infection and patient satisfaction.

Results

Forty-two patients were analyzed. Pain scores with movement at 24 h postoperatively were significantly lower in Group RP than that in Group Con (3 vs. 5 NRS, P<0.001). Compared with Group Con, breakthrough pain occurred later in Group RP (18.5 vs 10.0 h, P = 0.002), serial pain scores at rest and with movement and rate of patients with NRS>3 with movement after surgery were significantly lower. Quadriceps motor strength was equivalent, however, ambulated distance on postoperative day 1 and 2 in Group Con was significant less (19.7 vs 37.3 m, P = 0.046; 33.4 vs 59.5 m, P = 0.002).

Conclusions

Continuous adductor canal block added to single-dose LIA offered better analgesia and facilitated ambulation without motor weakness after medial UKA.

Trial registration

Clinical Trial Registration: ChiCTR-IOR-16008720; Registered 25 June 2016.
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Metadata
Title
Continuous Adductor Canal Block used for postoperative pain relief after medial Unicondylar Knee Arthroplasty: a randomized, double-blind, placebo-controlled trial
Authors
Fei Lan
Yanyan Shen
Yanhui Ma
Guanglei Cao
Nicole Philips
Ting Zhang
Tianlong Wang
Publication date
01-12-2019
Publisher
BioMed Central
Published in
BMC Anesthesiology / Issue 1/2019
Electronic ISSN: 1471-2253
DOI
https://doi.org/10.1186/s12871-019-0787-6

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