Chinese Journal of Tissue Engineering Research ›› 2021, Vol. 25 ›› Issue (33): 5395-5403.doi: 10.12307/2021.333

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Medial pivot versus posterior stabilized prostheses for total knee arthroplasty: a meta-analysis

Gu Mingxi, Zhu Yunong, Tian Fengde, An Ning, Wang Changcheng, Guo Lin   

  1. Second Department of Orthopedics, Zhongshan Hospital of Dalian University, Dalian 116001, Liaoning Province, China
  • Received:2020-12-24 Revised:2020-12-31 Accepted:2021-01-08 Online:2021-11-28 Published:2021-08-06
  • Contact: Guo Lin, Chief physician, Professor, MD, Master’s supervisor, Second Department of Orthopedics, Zhongshan Hospital of Dalian University, Dalian 116001, Liaoning Province, China
  • About author:Gu Mingxi, Master candidate, Second Department of Orthopedics, Zhongshan Hospital of Dalian University, Dalian 116001, Liaoning Province, China

Abstract: OBJECTIVE: Medial pivot and posterior stabilized prostheses are still controversial in terms of clinical outcomes after total knee arthroplasty. The aim of this study was to compare the differences in the main clinical outcome measures after surgery between the two groups of prostheses using meta-analysis. 
METHODS: PubMed, Medline, Cochrane Library, and China National Knowledge Infrastructure were searched for studies comparing the efficacy of medial pivot prosthesis and posterior stabilized prosthesis for total knee arthroplasty. The search period was from the date of database establishment to September 2020. Two researchers independently searched the literature and extracted the data. The quality of randomized controlled trials was evaluated using the Cochrane Collaboration's tool for assessing the risk of bias of randomized controlled trials. The quality of non-randomized controlled clinical trials was assessed using the NOS scale. RevMan 5.3 software was used for statistical analysis.
RESULTS: Finally, 18 controlled clinical trials were included, totally 3 025 knees for total knee arthroplasty. Meta-analysis results showed that compared with the selection of posterior stable prosthesis in total knee arthroplasty, the use of medial pivot prosthesis improved the Knee Society Score (MD=0.81, 95%CI:0.36−1.86, P=0.02). Radiographic results showed that the femoral crown inclination angle α of the medial pivot prosthesis was more in line with the optimal anatomical angle between the two groups of prostheses (MD=−0.80, 95%CI: −1.49 to −0.11, P=0.02). Medial pivot prosthesis had a lower incidence of overall postoperative complications (MD=−0.56, 95%CI: 0.34−0.97, P=0.03), while there were no significant differences in the postoperative range of motion, Knee Society Functional score, Oxford Knee scores, Hospital for Special Surgery knee Score, Western Ontario and McMaster Universities Osteoarthritis Index, Forgotten Joint Score, and revision rate.  
CONCLUSION: Compared with the selection of posterior stable prosthesis, the improvement of KSS score after total knee arthroplasty using medial pivot prosthesis has lower incidence rate of overall complications, better vectorial stability and more physiological function anatomy. This meta-analysis is based on limited data, still has some limitations, and more and higher quality studies are needed to verify the results.

Key words: joint, knee, knee joint, prosthesis, joint arthroplasty, total knee arthroplasty, medial pivot prosthesis, posterior stabilized prosthesis, meta-analysis

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