Comparing "people-like-me" and linear mixed model predictions of functional recovery following knee arthroplasty

Jeremy Graber, Andrew Kittelson, Elizabeth Juarez-Colunga, Xin Jin, Michael Bade, Jennifer Stevens-Lapsley

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Objective: Prediction models can be useful tools for monitoring patient status and personalizing treatment in health care. The goal of this study was to compare the relative strengths and weaknesses of 2 different approaches for predicting functional recovery after knee arthroplasty: a neighbors-based "people-like-me"(PLM) approach and a linear mixed model (LMM) approach. Materials and Methods: We used 2 distinct datasets to train and then test PLM and LMM prediction approaches for functional recovery following knee arthroplasty. We used the Timed Up and Go (TUG) - a common test of mobility - to operationalize physical function. Both approaches used patient characteristics and baseline postoperative TUG values to predict TUG recovery from days 1-425 following surgery. We then compared the accuracy and precision of PLM and LMM predictions. Results: A total of 317 patient records with 1379 TUG observations were used to train PLM and LMM approaches, and 456 patient records with 1244 TUG observations were used to test the predictions. The approaches performed similarly in terms of mean squared error and bias, but the PLM approach provided more accurate and precise estimates of prediction uncertainty. Discussion and Conclusion: Overall, the PLM approach more accurately and precisely predicted TUG recovery following knee arthroplasty. These results suggest PLM predictions may be more clinically useful for monitoring recovery and personalizing care following knee arthroplasty. However, clinicians and organizations seeking to use predictions in practice should consider additional factors (eg, resource requirements) when selecting a prediction approach.

Original languageEnglish
Pages (from-to)1899-1907
Number of pages9
JournalJournal of the American Medical Informatics Association : JAMIA
Issue number11
StatePublished - Nov 1 2022


FundersFunder number
Agency for Healthcare Research and QualityR01HS025692


    • patient-centered care
    • patient-specific modeling
    • precision medicine
    • prognosis
    • recovery of function
    • total knee arthroplasty


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