Li TJ, Sun JY, Du YQ, Shen JM, Zhang BH, Zhou YG. Different squatting positions after total knee arthroplasty: A retrospective study. World J Clin Cases 2022; 10(23): 8107-8114 [PMID: 36159530 DOI: 10.12998/wjcc.v10.i23.8107]
Corresponding Author of This Article
Yong-Gang Zhou, PhD, Chief Physician, Department of Orthopedics, The First Medical Center of PLA General Hospital, No. 28 Fuxing Road, Haidian District, Beijing 100048, China. ygzhou301@163.com
Research Domain of This Article
Orthopedics
Article-Type of This Article
Retrospective Study
Open-Access Policy of This Article
This article is an open-access article which was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/
Tie-Jian Li, Jing-Yang Sun, Yin-Qiao Du, Jun-Min Shen, Bo-Han Zhang, Yong-Gang Zhou, Department of Orthopedics, The First Medical Center of PLA General Hospital, Beijing 100048, China
Author contributions: Li TJ and Sun JY contributed equally to this article; Li TJ and Sun JY designed and performed the research and wrote the paper; Zhou YG designed the research and supervised the report; Du YQ designed the research and contributed to the analysis; Shen JM provided clinical advice.
Institutional review board statement: The study was reviewed and approved by the General Hospital of Chinese People’s Liberation Army Institutional Review Board, No. S2017-099-01.
Informed consent statement: All study participants or their legal guardian provided informed written consent about personal and medical data collection prior to study enrolment.
Conflict-of-interest statement: All the authors report no relevant conflicts of interest for this article.
Data sharing statement: Technical appendix, statistical code, and dataset available from the corresponding author at ygzhou301@163.com. Participants gave informed consent for data sharing.
Open-Access: This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: https://creativecommons.org/Licenses/by-nc/4.0/
Corresponding author: Yong-Gang Zhou, PhD, Chief Physician, Department of Orthopedics, The First Medical Center of PLA General Hospital, No. 28 Fuxing Road, Haidian District, Beijing 100048, China. ygzhou301@163.com
Received: November 29, 2021 Peer-review started: November 29, 2021 First decision: May 11, 2022 Revised: May 20, 2022 Accepted: July 11, 2022 Article in press: July 11, 2022 Published online: August 16, 2022 Processing time: 245 Days and 5.6 Hours
ARTICLE HIGHLIGHTS
Research background
Total knee arthroplasty (TKA) has been shown to improve quality of life and reduce pain. However, functional deficits can still be observed to persist after surgery.
Research motivation
The unfulfillment of preoperative expectations has been reported as one of the main determinants of postoperative dissatisfaction.
Research objectives
We aimed to provide a new squat position classification and evaluate the different squatting positions of a series of patients who underwent primary TKA.
Research methods
From May 2018 to October 2019, we retrospectively reviewed 154 video recordings of the squatting-related motions of patients after TKA. Among the included patients, 119 were women and 35 were men. Their mean age at the index surgery was 61.4 years (range, 30 to 77 years).
Research results
A total of 26 patients were classified as half squats, 75 as parallel squats, and 53 as deep squats. The angles of hip flexion, knee flexion, and ankle dorsiflexion all differed significantly among the three squatting positions (P < 0.001). In the parallel squat group, the mean knee flexion angle (°) was 116.5 (SD, 8.1; range, 97 to 137). In the deep squat group, the mean knee flexion angle (°) was 132.5 (SD, 9.3; range, 116 to 158).
Research conclusions
Among the three squatting positions, deep squat showed the highest hip, knee, and ankle flexion angles, followed by the parallel squat. With the improvement of squatting ability, the patient's postoperative satisfaction rate was also significantly enhanced.
Research perspectives
Our squatting position classification offers a pragmatic approach to evaluating patients’ squatting ability after TKA.
