J Knee Surg 2022; 35(13): 1425-1433
DOI: 10.1055/s-0041-1723982
Original Article

Early Stage Versus Late Stage Periarticular Injection during Unicompartmental Knee Arthroplasty for Postoperative Pain Relief: A Randomized Controlled Trial

Wang Chen*
1   Department of Orthopedic Surgery, Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu, China
,
Jian-Ning Sun
1   Department of Orthopedic Surgery, Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu, China
1   Department of Orthopedic Surgery, Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu, China
,
Zheng-Hao Hu
1   Department of Orthopedic Surgery, Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu, China
,
Yu Zhang
1   Department of Orthopedic Surgery, Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu, China
,
1   Department of Orthopedic Surgery, Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu, China
,
Shuo Feng**
1   Department of Orthopedic Surgery, Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu, China
› Author Affiliations

Funding None.
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Abstract

Controlling postoperative pain after unicompartmental knee arthroplasty (UKA) is essential to improve patient satisfaction and promote early recovery. The purpose of this study was to investigate the difference in clinical efficacy between early and late stage periarticular injection during UKA for postoperative pain relief. Eighty-four patients meeting the inclusion and exclusion criteria were randomly divided into the early stage periarticular injection group and late stage periarticular injection group by using a random number tables method. The difference between the two groups was that the early stage periarticular injection group received superficial injection before the joint incision, while the late stage periarticular injection group received superficial injection after implantation of the prosthesis. Deep injection and other perioperative conditions of the two groups were controlled identically. The primary outcome of the study was the recovery room immediate visual analog scale (VAS) at rest. The secondary outcomes were the postoperative VAS (at rest) at 3, 6, 9, 12, 18, 24, 48, 72, 96, and 120 hours, drug dosage of rescue analgesia, range of motion (ROM), and complications. The recovery room immediate VAS (at rest) in the early stage periarticular injection group was significantly lower than that of the late stage periarticular injection group (21 ± 24 vs. 32 ± 34 mm, p = 0.018), the average difference of the VAS reached the minimal clinically important difference. No statistically significant difference in postoperative drug dosage of rescue analgesia, ROM, and complications. Preemptive analgesia combined with the early stage periarticular injection can better alleviate postoperative pain than the late stage periarticular injection.

Note

This study was approved by the Ethics Committee of Affiliated Hospital of Xuzhou Medical University. All participants signed an informed consent form.


Authors' Contributions

W.C. and J.-N.S. did the study and W.C. drafted the manuscript. Z.-H.H. and Y.Z. were involved in the design. X.-Y.C. and S.F. were involved in the study design and made further revision in this manuscript. All authors read and approved the final manuscript.


* Co-first authors.


** Co-corresponding authors.




Publication History

Received: 21 October 2020

Accepted: 02 January 2021

Article published online:
22 February 2021

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