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Table 2 Assignment of research factors and IKDC classification

From: Factors influencing postoperative outcomes in patients with symptomatic discoid lateral meniscus

Factors/IKDC classification Valuation
Sex (X1) male “0”; female “1”
BMI (kg/m2) (X2) X2 < 18.5 “1”; 18.5 ≤ X2 < 25 “2”; X2 ≥ 25 “3”
Work intensity (X3) grade 0 ~ 1 “1”; grade 2 “2”; grade 3 ~ 4 “3”
History of trauma (X4) no “0”; yes “1”
Involved knee joint (X5) left knee “0”; right knee “1”
Age of onset (year) (X6) X6 ≤ 14 “1”; 14 < X6< 25 “2”; 25 ≤ X6 < 45 “3”; X6 ≥ 45 “4”
Symptom duration (month) (X7) X7 ≤ 1 “1”; 1 < X7 ≤ 6 “2”; 6 < X7 ≤ 24 “3”; X7 > 24 “4”
Watanabe type (X8) type I (complete) “1”; type II (incomplete) “2”
O’Connor type (X9) no “0”; longitudinal (/bucket handle) tear “1”; horizontal tear “2”; oblique tear “3”; transverse (/radiation) tear “4”; variant tear (including flap, composite, degenerate meniscus tear) “5”
Medial meniscus tear (X10) no “0”; yes “1”
Outerbridge grade (X11) no “0”; grade I “1”; grade II “2”; grade III ~ IV “3”
K-L grade (X12) grade 0 “0”; grade I “1”; grade II “2”; grade III ~ IV “3”
Type of surgery (X13) Saucerization “1”; Saucerization with repair “2”; Total meniscectomy “3”
Follow-up time (month)(X14) X14 ≤ 60 “1”; 60 < X14 ≤ 96; X14 > 96
IKDC classification (Y) < 70 (poor) ~ 70–79 (fair) “1”; 80–89 (good) “2”; ≥90 (excellent) “3”
  1. BMI body mass index, K-L grade Kellgren–Lawrence grade, DLM discoid lateral meniscus, IKDC International Knee Documentation Committee