Adductor canal block versus femoral nerve block for total knee arthroplasty: a meta-analysis of randomized controlled trials

Duan Wang, Yang Yang, Qi Li, Shen-Li Tang, Wei-Nan Zeng, Jin Xu, Tian-Hang Xie, Fu-Xing Pei, Liu Yang, Ling-Li Li, Zong-Ke Zhou, Duan Wang, Yang Yang, Qi Li, Shen-Li Tang, Wei-Nan Zeng, Jin Xu, Tian-Hang Xie, Fu-Xing Pei, Liu Yang, Ling-Li Li, Zong-Ke Zhou

Abstract

Femoral nerve blocks (FNB) can provide effective pain relief but result in quadriceps weakness with increased risk of falls following total knee arthroplasty (TKA). Adductor canal block (ACB) is a relatively new alternative providing pure sensory blockade with minimal effect on quadriceps strength. The meta-analysis was designed to evaluate whether ACB exhibited better outcomes with respect to quadriceps strength, pain control, ambulation ability, and complications. PubMed, Embase, Web of Science, Wan Fang, China National Knowledge Internet (CNKI) and the Cochrane Database were searched for RCTs comparing ACB with FNB after TKAs. Of 309 citations identified by our search strategy, 12 RCTs met the inclusion criteria. Compared to FNB, quadriceps maximum voluntary isometric contraction (MVIC) was significantly higher for ACB, which was consistent with the results regarding quadriceps strength assessed with manual muscle strength scale. Moreover, ACB had significantly higher risk of falling versus FNB. At any follow-up time, ACB was not inferior to FNB regarding pain control or opioid consumption, and showed better range of motion in comparison with FNB. ACB is superior to the FNB regarding sparing of quadriceps strength and faster knee function recovery. It provides pain relief and opioid consumption comparable to FNB and is associated with decreased risk of falls.

Figures

Figure 1. Flow chart showing study identification,…
Figure 1. Flow chart showing study identification, inclusion and exclusion.
Figure 2
Figure 2
(A) Risk of bias graph; (B) for Risk of bias summary (“+” indicates a low risk of bias, “−” indicates a high risk of bias, “?” indicates unclear or unknown risk of bias).
Figure 3. Forest plot of quadriceps and…
Figure 3. Forest plot of quadriceps and adductor MVIC between ACB and FNB.
(MVIC, maximum voluntary isometric contraction).
Figure 4. Forest plot of pain score…
Figure 4. Forest plot of pain score at rest between ACB and FNB.
Figure 5. Forest plot of pain score…
Figure 5. Forest plot of pain score at activity between ACB and FNB.
Figure 6
Figure 6
(A) Forest plot of opioid consumption between ACB and FNB; (B) Forest plot of risk of falls between ACB and FNB.
Figure 7. Funnel plots of primary outcomes.
Figure 7. Funnel plots of primary outcomes.
(A) For pain score at rest; (B) for pain score at activity; (C) for quadriceps and adductor strength measured by MVIC; (D) for quadriceps strength measured by manual 5-grade motor-strength scale.

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Source: PubMed

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