Abstract
Objective
To clarify the interactive combinations of various clinical factors associated with
physical activity (PA) at 2 years after total knee arthroplasty (TKA) using classification
and regression tree (CART) analysis.
Design
A retrospective cohort study.
Setting
A single university hospital.
Participants
286 patients who underwent TKA (N=286).
Main Outcome Measures
PA was assessed preoperatively, 3 weeks, and 2 years after TKA. Physical functions,
namely, 10 m walking test (10MWT), timed Up and Go test, 1-leg standing time, isometric
knee extension and flexion strength, knee joint stability, knee pain, femora-tibial
angle, and the passive knee extension and flexion angle, were measured before surgery
as a baseline and 3 weeks after TKA as acute phase. CART analysis was conducted to
clarify the interactive combinations that accurately predict the PA at 2 years after
TKA.
Results
The results of CART analysis indicated that gait speed (≥1.05 m/s) at the acute phase
after TKA was the primal predictor for the postoperative PA at 2 years. The highest
postoperative PA at 2 years was determined by gait speed (≥1.05 m/s) and PA (>74.5)
at the acute phase. The PA at baseline and at acute phase, as well as the body mass
index were also selected as predictors of postoperative PA at 2 years.
Conclusion
The present study suggested that acquiring gait speed (≥1.05 m/s) and PA (>74.5) in
the postoperative acute phase is the predictive of a high PA at 2 years after TKA.
Keywords
List of abbreviations:
BMI (body mass index), CART (classification and regression tree), FTA (femora-tibial angle), PA (physical activity), QOL (quality of life), R2 (coefficient of determination), TKA (total knee arthroplasty), TUG (timed Up and Go test), 10MWT (10 m walking test)To read this article in full you will need to make a payment
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Article info
Publication history
Published online: January 24, 2023
Accepted:
December 7,
2022
Received in revised form:
December 1,
2022
Received:
June 29,
2022
Publication stage
In Press Journal Pre-ProofFootnotes
Disclosures: Some authors (S.M., S.K., K.N.) have a financial relation with Kyocera unrelated to this study. The other authors have nothing to disclose.
Identification
Copyright
© 2023 by the American Congress of Rehabilitation Medicine.
