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Table 2 The Fabellar parameters a

From: The prevalence and parameters of fabella and its association with medial meniscal tear in China: a retrospective study of 1011 knees

Fabellar parameter Length, mm Thickness, mm Width, mm DFI, mm Length/Thickness Width/Thickness Length/Width
Gender
Male (n = 202) 7.96 ± 1.80 5.00 ± 1.61 6.86 ± 2.05 34.8 ± 4.5 1.68 ± 0.42 1.44 ± 0.43 1.22 ± 0.31
Female (n = 200) 7.08 ± 2.37 4.06 ± 1.31 6.08 ± 2.37 31.3 ± 3.9 1.81 ± 0.51 1.54 ± 0.57 1.23 ± 0.31
P value  < 0.001  < 0.001  < 0.001  < 0.001 0.015 0.044 0.528
Side
Right (n = 224) 7.55 ± 2.33 4.53 ± 1.59 6.41 ± 2.40 33.0 ± 4.7 1.74 ± 0.47 1.46 ± 0.44 1.24 ± 0.32
Left (n = 178) 7.49 ± 1.90 4.52 ± 1.47 6.54 ± 2.05 33.0 ± 4.4 1.75 ± 0.47 1.53 ± 0.58 1.20 ± 0.30
P value 0.781 0.972 0.336 0.956 0.856 0.395 0.367
Articulating groove
Yes (n = 179) 8.68 ± 1.85 5.44 ± 1.41 7.36 ± 2.12 32.8 ± 4.6 1.67 ± 0.44 1.39 ± 0.37 1.24 ± 0.30
No (n = 223) 6.59 ± 1.92 3.79 ± 1.21 5.75 ± 2.09 33.2 ± 4.5 1.81 ± 0.48 1.58 ± 0.58 1.21 ± 0.32
P value  < 0.001  < 0.001  < 0.001 0.349  < 0.001  < 0.001 0.381
MM tear
Yes (n = 122) 8.22 ± 2.36 4.38 ± 1.45 7.11 ± 2.37 32.6 ± 4.3 1.97 ± 0.50 1.70 ± 0.60 1.21 ± 0.33
No (n = 280) 7.21 ± 1.98 4.59 ± 1.58 6.19 ± 2.14 33.2 ± 4.7 1.65 ± 0.42 1.40 ± 0.43 1.23 ± 0.30
P value  < 0.001 0.294 0.001 0.314  < 0.001  < 0.001 0.408
Age groupb
 ≤ 20 (n = 19) 7.79 ± 2.18 5.29 ± 1.42 6.64 ± 1.59 33.5 ± 5.8 1.49 ± 0.29 1.33 ± 0.40 1.20 ± 0.32
21–30 (n = 54) 7.17 ± 1.97 5.08 ± 1.76 6.42 ± 2.15 34.0 ± 4.8 1.47 ± 0.33 1.32 ± 0.39 1.16 ± 0.27
31–40 (n = 91) 6.92 ± 1.77 4.61 ± 1.58 6.07 ± 2.06 33.4 ± 4.3 1.56 ± 0.32 1.35 ± 0.36 1.20 ± 0.29
41–50 (n = 82) 7.02 ± 1.83 4.29 ± 1.48 6.09 ± 2.32 33.6 ± 5.0 1.71 ± 0.37 1.43 ± 0.44 1.23 ± 0.30
51–60 (n = 57) 7.63 ± 2.10 4.33 ± 1.43 6.65 ± 2.28 32.6 ± 4.4 1.86 ± 0.52 1.61 ± 0.55 1.21 ± 0.32
 ≥ 61 (n = 99) 8.55 ± 2.45 4.30 ± 1.40 7.03 ± 2.47 31.8 ± 4.0 2.07 ± 0.52 1.71 ± 0.65 1.28 ± 0.35
P value  < 0.001 0.011 0.078 0.115  < 0.001  < 0.001 0.417
Overall (n = 402) 7.52 ± 2.15 4.53 ± 1.54 6,47 ± 2.25 33.0 ± 4.6 1.75 ± 0.47 1.49 ± 0.51 1.22 ± 0.31
  1. aValues are presented as mean ± standard deviation mm. P values refer to independent samples t test, Mann–Whitney U test or Kruskal–Wallis H test for pooled values. DFI distance between the fabella and the insertion of the lateral head of the gastrocnemius onto the femur, MM medial meniscus. br = 0.463, P < 0.001 for length/thickness ratio, r = 0.303, P < 0.001 for width/thickness ratio; Spearman nonparametric correlation test