Fig. 2

Feature importance plot for the random forest model based on the independent test set. Each predictive weight of each variable is compared among the other seven variables chosen from recursive feature elimination with cross-validation. KOOS = Knee Injury and Osteoarthritis Outcome Score, SF-36 PCS = Short-Form 36 questionnaire Physical Component Summary, IKDC = International Knee Documentation Committee, HKA = hip–knee–ankle, QOL = quality of life, BMI = body mass index, and MPTA = medial proximal tibial angle