Adequate Positioning of the Tibial Component Is Key to Avoiding Bearing Impingement in Oxford Unicompartmental Knee Arthroplasty

Objective This study was performed to investigate the influence of a standard Oxford vertical cut on the coronal coverage and rotation of the tibial component and determine whether a relationship exists between coverage and rotation. Methods We retrospectively analyzed 71 patients with anteromedial osteoarthritis of the knee treated by Oxford unicompartmental knee arthroplasty in one center from October 2016 to October 2017. The distance of coronal coverage was measured on a postoperative anteroposterior view of the tibial component. Two different reference lines between the lateral wall of the tibial component were defined as rotation angle α and β, respectively, on a computed tomography scan. Results The mean distance was 0.3 ± 1.1 mm. The mean angle α and β were 5.7° ± 4.6° and 8.4° ± 4.6°, respectively. There were no significant differences in the distance according to the tibial component rotation or in the α and β angles according to the coronal coverage. No significant correlation was found between the α and β angles and the distance. Conclusion A standard tibial vertical cut caused various changes in coronal coverage and rotation of the tibial component. The rotation of the tibial component did not affect coverage within a certain range.

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Unicompartmental knee arthroplasty failure with tibial component migration: Case report

International Journal of Case Reports in Orthopaedics ◽

10.22271/27078345.2021.v3.i1a.43 ◽

2021 ◽

Vol 3 (1) ◽

pp. 18-20

Author(s):

Ana Ribau ◽

Sara Elisa Diniz ◽

João Vale ◽

José Costa e Castro

Keyword(s):

Case Report ◽

Knee Arthroplasty ◽

Unicompartmental Knee Arthroplasty ◽

Tibial Component ◽

Unicompartmental Knee ◽

Component Migration ◽

Arthroplasty Failure

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Complications, Reasons for Reoperation, and 5-Year Prosthesis Survival Compared Between the Cemented and Cementless Oxford Unicompartmental Knee Arthroplasty Fixation Techniques at Thailand’s Largest National Tertiary Referral Center

10.21203/rs.3.rs-583930/v1 ◽

2021 ◽

Author(s):

Jirayu Paugchawee ◽

Chaturong Pornrattanamaneewong ◽

Pakpoom Ruangsomboon ◽

Rapeepat Narkbunnam ◽

Keerati Chareancholvanich

Keyword(s):

Knee Osteoarthritis ◽

Knee Arthroplasty ◽

Unicompartmental Knee Arthroplasty ◽

Cox Proportional Hazards Model ◽

Implant Survival ◽

Unicompartmental Knee ◽

Prosthesis Survival ◽

Significant Difference ◽

Oxford Unicompartmental Knee Arthroplasty

Abstract Background: Oxford unicompartmental knee arthroplasty (OUKA) yields favorable outcomes in patients with medial compartmental knee osteoarthritis; however, it remains unknown whether cemented or cementless OUKA fixation delivers better outcomes in Asian population. Accordingly, this study aimed to investigate the complications, reasons for reoperation, and 5-year prosthesis survival compared between cemented and cementless OUKA in Thai patients.Methods: A total of 466 cemented and 36 cementless OUKA that were performed during 2011-2015 with a minimum follow-up of five years were included. With reoperation for any reason as the endpoint, Kaplan-Meier analysis was performed to compare 5-year implant survival between groups. Complications, reasons for reoperation, and 90-day morbidity and mortality were compared between groups. Cox proportional hazards model was used to identify independent predictors of implant survival.Results: There was no significant difference in 5-year implant survival between the cemented and cementless groups (96.4% vs. 94.4%, p=0.375). The mean implant survival time was 113.0±0.8 and 70.8±1.9 months in the cemented and cementless groups, respectively (p=0.383). The most common reason for reoperation was bearing dislocation, and only one patient had 90-day morbidity. There was no significant difference between groups for complications or reasons for reoperation. No independent predictors of implant survival were identified in multivariate analysis.Conclusions: OUKA was shown to be a safe and durable reconstructive procedure in Thai patients with medial compartmental knee osteoarthritis. There was no significant difference in implant survival between the cemented and cementless groups during the 5-year follow-up, and no independent predictors of implant survival were identified. Trial registration: Thai Clinical Trials Registry, TCTR20200427004. Registered 27 April 2020 – Retrospectively registered.

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