Survivorship of the fixed-bearing medial unicompartmental knee arthroplasty: mean 14-year follow-up in a single medical center

This study aimed to report the long-term survival of fixed-bearing medial unicompartmental knee arthroplasty (UKA) with a mean of 14-year follow-up, and to determine possible risk factors of failure. We retrospectively evaluated 337 fixed-bearing medial UKAs implanted between 2003 and 2014. Demograp...

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Bibliographic Details
Published in:BMC musculoskeletal disorders 2024-04, Vol.25 (1), p.283-283, Article 283
Main Authors: Hung, Kung-Tseng, Chen, Chun-Chieh, Lin, Yu-Chih, Lee, Sheng-Hsun, Hu, Chih-Chien, Chang, Yu-Han, Hsieh, Pang-Hsin, Shih, Hsin-Nung, Chang, Chih-Hsiang
Format: Article
Language:English
Subjects:
Arthritis
Arthroplasty (knee)
Arthroplasty, Replacement, Knee - adverse effects
Bone implants
Care and treatment
Complications and side effects
Decision-making
Diagnosis
Failure
Fixed-bearing
Follow-Up Studies
Fractures
Health aspects
Humans
Hypertension
Joint replacement surgery
Knee
Multivariate analysis
Osteoarthritis
Patients
Periprosthetic Fractures
Prostheses
Regression analysis
Retrospective Studies
Risk factors
Statistical analysis
Surgical techniques
Survival
Survival analysis
Survivorship
Unicompartmental knee arthroplasty
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Summary:This study aimed to report the long-term survival of fixed-bearing medial unicompartmental knee arthroplasty (UKA) with a mean of 14-year follow-up, and to determine possible risk factors of failure. We retrospectively evaluated 337 fixed-bearing medial UKAs implanted between 2003 and 2014. Demographic and radiographic parameters were measured, including pre-operative and post-operative anatomical femorotibial angle (aFTA), posterior tibial slope (PTS), and anatomical medial proximal tibial angle (aMPTA). Multivariate logistic regression analysis was applied to figure out risk factors. The mean follow-up time was 14.0 years. There were 32 failures categorized into implant loosening (n = 11), osteoarthritis progression (n = 7), insert wear (n = 7), infection (n = 4), and periprosthetic fracture (n = 3). Cumulative survival was 91.6% at 10 years and 90.0% at 15 years. No statistically significant parameters were found between the overall survival and failure groups. Age and hypertension were significant factors of implant loosening with odds ratio (OR) 0.909 (p = 0.02) and 0.179 (p = 0.04) respectively. In the insert wear group, post-operative aFTA and correction of PTS showed significance with OR 0.363 (p = 0.02) and 0.415 (p = 0.03) respectively. Post-operative aMPTA was a significant factor of periprosthetic fracture with OR 0.680 (p 
ISSN:1471-2474
1471-2474
DOI:10.1186/s12891-024-07378-1