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) | Â | Â | Â | 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 | Â | Â | Â | 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) | Â | Â | Â | 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) | Â | Â | Â | 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) | Â | Â |
 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 | Â | Â | Â | 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 | Â | Â | Â | 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) | Â | Â | Â | 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 | Â | Â | Â | 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) |  |  |