Chinese Journal of Tissue Engineering Research ›› 2021, Vol. 25 ›› Issue (33): 5318-5323.doi: 10.12307/2021.320

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Medium- and long-term assessment of lateral compartment and patellofemoral compartment osteoarthritis after medial unicompartmental knee arthroplasty with Oxford mobile-bearing

Qiao Renqiu, Yin Li, Zhang Yi, Wang Haitao, Xia Peige, Kong Zhiheng   

  1. Department of Orthopedics, First Affiliated Hospital of Zhengzhou University, Zhengzhou 450000, Henan Province, China
  • Received:2021-01-25 Revised:2021-01-27 Accepted:2021-03-10 Online:2021-11-28 Published:2021-08-05
  • Contact: Yin Li, MD, Chief physician, Master’s supervisor, Department of Orthopedics, First Affiliated Hospital of Zhengzhou University, Zhengzhou 450000, Henan Province, China
  • About author:Qiao Renqiu, Master candidate, Department of Orthopedics, First Affiliated Hospital of Zhengzhou University, Zhengzhou 450000, Henan Province, China

Abstract: BACKGROUND: Unicompartmental knee arthroplasty has attracted more and more attention because of its advantages, such as less trauma, faster recovery, less cost and better proprioception. However, there are few studies on the medium- and long-term development of lateral compartment and patellofemoral compartment osteoarthritis after mobile-bearing medial unicompartmental knee arthroplasty.  
OBJECTIVE: To evaluate the progression of posterolateral and patellofemoral osteoarthritis with mobile-bearing medial unicompartmental knee arthroplasty.
METHODS:  Totally 95 patients who underwent mobile-bearing medial unicompartmental knee arthroplasty in the Department of Orthopedics of First Affiliated Hospital of Zhengzhou University from January 2011 to January 2016 were retrospectively analyzed. Lateral compartment osteoarthritis was assessed by Kellgren-Lawrence classification based on preoperative and final follow-up knee radiographs; there were advanced group (n=32) and non-advanced group (n=63). Patellofemoral compartment osteoarthritis was assessed by Kellgren-Lawrence classification; there were advanced group (n=41) and non-advanced group (n=54). Imaging and clinical features were compared in the advanced group and non-advanced group to analyze the relationship between the postoperative effect and the progression of lateral and patellofemoral compartment osteoarthritis.  
RESULTS AND CONCLUSION: (1) During final follow-up, compared with the non-advanced group, Hospital for Special Surgery scores were lower in the advanced group after lateral compartment osteoarthritis (P < 0.05); however, the visual analogue scale score and forgotten joint score were higher (P < 0.05). (2) The incidence of osteoarthritis progression in the lateral compartment (33.7%) was less than that in the patellofemoral compartment (43.2%) after mobile-bearing medial Unicompartmental knee arthroplasty. There was no significant correlation between the progression of lateral compartment osteoarthritis and the progression of patellofemoral compartment osteoarthritis (P > 0.05). (3) After 5-10 years follow-up, there were no complications such as infection, polyethylene gasket dislocation or periprosthetic fracture. (4) The medium and long-term outcomes of the mobile-bearing medial unicompartmental knee arthroplasty were mainly affected by the progression of lateral compartment osteoarthritis, but not by the patellofemoral compartment.

Key words: Key words, unicompartmental knee arthroplasty, mobile bearing, lateral compartment, patellofemoral compartment, osteoarthritis, forgotten joint score, visual analogue scale, Hospital for Special Surgery score

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