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Temporal patterns of commonly used clinical outcome scales during a 5-year period after total knee arthroplasty

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Authors
Tiwari, Vivek; Lee, Jonggeun; Sharma, Gaurav; Kang, Yeon Gwi; Kim, Tae Kyun
Issue Date
2019-03-25
Publisher
Springer Open
Citation
Journal of Orthopaedics and Traumatology, 20(1):16
Keywords
Total knee arthroplastyFunctional outcomePatternAgeProsthesis
Abstract
Background
It is not established beyond doubt whether improvements in functional outcome after total knee arthroplasty (TKA) are maintained in the long term. We therefore investigated the temporal patterns of functional outcome [using range of motion (ROM), American Knee Society (AKS) score, Western Ontario and McMaster Universities Arthritis Index (WOMAC) score, and 36-Item Short Form Health Survey (SF-36) score] over a 5-year period after uncomplicated TKA, and whether these patterns differed by implant type and patient age.

Materials and methods
This prospective study evaluated 138 patients who underwent unilateral TKA with either a mobile-bearing (MB) or fixed-bearing (FB) posterior-stabilized prosthesis. An independent investigator evaluated the functional outcome at five time points: preoperatively and at 6-month, 1-year, 2-year, and 5-year follow-up. Differences in functional outcomes between adjacent time points were evaluated by mixed-effect model repeat measurement (MMRM).

Results
The different functional outcome scores showed improvement till 6 months–2 years, followed by a variable decline. In patients aged ≥ 68 years with an MB implant, most of the functional outcome scores declined between 2 and 5 years after variable initial improvement till 6 months–2 years, whereas the parameters plateaued after 2 years in those aged < 68 years and in older patients with an FB implant.

Conclusions
A decline in function and pain relief occurs 2 years after TKA. This decline is more evident in older patients with an MB prosthesis. Based on these findings, we believe that use of MB implants in older patients (≥ 68 years) requires further investigation.

Level of evidence
Level 3.
ISSN
1590-9921
Language
English
URI
http://hdl.handle.net/10371/153128
DOI
https://doi.org/10.1186/s10195-019-0520-8
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College of Medicine/School of Medicine (의과대학/대학원)Orthopedic Surgery (정형외과학전공)Journal Papers (저널논문_정형외과학전공)
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