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Table 4 Univariate analysis of the correlation between the research factors and IKDC classification

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

Variable IKDC grade Z/kruskall-wallis χ2 P
Fair and poor
N (%) †
Good
N (%) †
Excellent
N (%) †
Sex     −4.362 0.000*
 Female 114(32.3) 119(33.7) 120(34.0)   
 male 25(16.8) 45(30.2) 79(53.0)   
BMI (kg/m2)     66.642 0.000*
  < 18.5 7(13.0) 4(7.4) 43(79.6)   
 18.5 ~ 25 86(23.8) 129(35.6) 147(40.6)   
  ≥ 25 46(53.5) 31(36.0) 9(10.5)   
Work intensity     74.092 0.000*
 Grade 0 ~ 1 39(16.3) 56(23.4) 144(60.3)   
 Grade 2 90(37.5) 98(40.8) 52(21.7)   
 Grade 3 ~ 4 10(43.5) 10(43.5) 3(13.0)   
History of trauma     −2.618 0.009*
 No 113(31.4) 113(31.4) 134(37.2)   
 Yes 26(18.3) 51(35.9) 65(45.8)   
Involved knee joint     −0.843 0.399
 Left 65(25.8) 84(33.3) 103(40.9)   
 Right 74(29.6) 80(32.0) 96(38.4)   
Age of onset (year)     188.575 0.000*
  ≤ 14 2(2.3) 11(12.5) 75(85.2)   
 14 ~ 25 9(8.9) 22(21.8) 70(69.3)   
 25 ~ 45 62(30.7) 94(46.5) 46(22.8)   
  ≥ 45 66(59.5) 37(33.3) 8(7.2)   
Symptoms duration (month)     26.939 0.000*
  ≤ 1 13(20.3) 21(32.8) 30(46.9)   
 1 ~ 6 34(22.8) 52(34.9) 63(42.3)   
 6 ~ 24 43(23.4) 58(31.5) 83(45.1)   
 >24 49(46.7) 33(31.4) 23(21.9)   
Watanabe type     −1.867 0.062
 Complete 111(26.2) 138(32.6) 174(41.1)   
 Incomplete 28(35.4) 26(32.9) 25(31.6)   
O’Connor tear type     8.129 0.149
 No tearing 12(31.6) 11(28.9) 15(39.5)   
 Longitudinal (/bucket handle) tear 50(29.2) 51(29.8) 70(40.9)   
 Horizontal tear 31(20.1) 53(34.4) 70(45.5)   
 Oblique tear 3(30.0) 4(40.0) 3(30.0)   
Transverse (/radial) tear 15(33.3) 14(31.1) 16(35.6)   
 Variant tear 28(33.3) 31(36.9) 25(29.8)   
Medial meniscus tear     −2.876 0.004*
 No 127(26.2) 162(33.5) 195(40.3)   
 Yes 12(66.7) 2(11.1) 4(22.2)   
Outerbridge grade     116.370 0.000*
 No injury 51(14.2) 129(36.0) 178(49.7)   
 Grade I 11(37.9) 6(20.7) 12(41.4)   
 Grade II 29(55.8) 18(34.6) 5(9.6)   
 Grade III ~ IV 48(76.2) 11(17.5) 4(6.3)   
K-L grade     116.570 0.000*
 Grade 0 57(15.2) 133(35.5) 185(49.3)   
 Grade I 26(46.4) 19(33.9) 11(19.6)   
 Grade II 34(77.3) 9(20.5) 1(2.3)   
 Grade III ~ IV 22(81.5) 3(11.1) 2(7.4)   
Follow-up time (month)     5.542 0.063
  ≤ 60 47(34.8) 44(32.6) 44(32.6)   
 60–96 65(25.6) 81(31.9) 108(42.5)   
 >96 27(23.9) 39(34.5) 47(41.6)   
Type of surgery     77.186 0.000*
 Saucerization 80(19.5) 142(34.6) 188(45.9)   
 Saucerization with repair 5(31.3) 5(31.3) 6(37.5)   
 Total meniscectomy 54(71.1) 17(22.4) 5(6.6)   
  1. IKDC International Knee Documentation Committee, BMI body mass index, K-L grade Kellgren–Lawrence grade, †N number
  2. *Statistically significant (P < .05)