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Table 2 Demographic statistics and sex differences (n = 78 knees)

From: The patellofemoral morphology and the normal predicted value of tibial tuberosity-trochlear groove distance in the Chinese population

 

men

women

overall

p value

p’ value

Age(y)

34 ± 3 (28 ~ 41)

29 ± 5 (21 ~ 40)

32 ± 5 (21 ~ 41)

< 0.01

 

Height(cm)

177 ± 5 (168 ~ 185)

165 ± 3 (160 ~ 170)

171 ± 8 (160 ~ 185)

< 0.01

 

Weight(kg)

70 ± 9 (58 ~ 95)

57 ± 6 (45 ~ 70)

64 ± 10 (46 ~ 90)

< 0.01

 

BMI

22.37 ± 1.79 (19.60 ~ 27.72)

20.98 ± 2.18 (16.33 ~ 26.35)

21.70 ± 2.09 (16.88 ~ 26.38)

< 0.01

 

PT(mm)

22.42 ± 1.57 (20.21 ~ 26.36)

19.80 ± 1.29 (17.33 ~ 22.85)

21.15 ± 1.94 (17.43 ~ 25.79)

< 0.01

0.188

PFT(mm)

11.77 ± 0.93 (10.33 ~ 13.54)

10.94 ± 0.96 (8.85 ~ 13.41)

11.36 ± 1.03 (9.13 ~ 13.46)

< 0.01

0.935

PW(mm)

46.94 ± 2.50 (41.73 ~ 53.55)

40.51 ± 2.34 (34.81 ~ 45.12)

43.81 ± 4.03 (36.72 ~ 52.22)

< 0.01

< 0.01

PLFW(mm)

27.18 ± 2.18 (22.52 ~ 33.06)

23.34 ± 1.59 (19.64 ~ 27.20)

25.31 ± 2.71 (20.41 ~ 31.26)

< 0.01

< 0.01

Wiberg index

0.58 ± 0.03 (0.51 ~ 0.69)

0.58 ± 0.03 (0.51 ~ 0.64)

0.58 ± 0.03 (0.51 ~ 0.65)

0.797

NA

PLL(mm)

45.21 ± 2.75 (38.88 ~ 51.36)

38.84 ± 2.64 (33.99 ~ 47.01)

42.11 ± 4.17 (34.39 ~ 51.08)

< 0.01

< 0.01

PAL(mm)

30.75 ± 2.43 (25.70 ~ 38.21)

26.82 ± 1.81 (22.89 ~ 31.65)

28.83 ± 2.91 (23.66 ~ 37.25)

< 0.01

0.089

fML(mm)

86.35 ± 3.99 (79.93 ~ 94.34)

74.14 ± 3.11 (67.51 ~ 82.44)

80.40 ± 7.10 (70.24 ~ 93.70)

< 0.01

< 0.01

fAP(mm)

66.78 ± 3.30 (60.66 ~ 74.32)

60.15 ± 2.81 (55.04 ~ 64.87)

63.54 ± 4.52 (55.57 ~ 72.52)

< 0.01

0.107

fML/fAP

1.29 ± 0.05 (1.23 ~ 1.49)

1.23 ± 0.05 (1.15 ~ 1.36)

1.26 ± 0.06 (1.15 ~ 1.37)

< 0.01

< 0.01

tML(mm)

80.46 ± 2.83 (75.83 ~ 87.70)

70.16 ± 2.52 (64.37 ~ 76.81)

75.44 ± 5.82 (66.31 ~ 86.48)

< 0.01

< 0.01

tAP(mm)

55.75 ± 3.13 (48.60 ~ 63.14)

48.72 ± 2.29 (44.27 ~ 53.75)

52.32 ± 4.47 (44.82 ~ 62.80)

< 0.01

< 0.01

TTTG(mm)

14.29 ± 2.11 (6.55 ~ 17.00)

12.92 ± 0.86 (11.10 ~ 15.02)

13.62 ± 1.76 (8.31 ~ 16.94)

< 0.01

0.090

AFO(mm)

6.37 ± 1.39 (3.90 ~ 8.96)

5.62 ± 1.37 (3.14 ~ 8.09)

6.01 ± 1.42 (3.36 ~ 8.60)

0.019

NA

PFO(mm)

26.77 ± 2.05 (22.77 ~ 31.54)

24.62 ± 1.78 (21.50 ~ 28.08)

25.73 ± 2.19 (21.77 ~ 30.12)

< 0.01

0.291

SA(°)

139.44 ± 4.95 (129.50 ~ 151.69)

138.20 ± 4.55 (125.36 ~ 148.80)

138.83 ± 4.77 (129.11 ~ 148.87)

0.254

NA

LTI(°)

20.92 ± 2.82 (15.57 ~ 27.93)

21.61 ± 3.71 (11.16 ~ 29.08)

21.25 ± 3.28 (14.93 ~ 28.48)

0.358

NA

MTI(°)

19.65 ± 3.58 (11.53 ~ 29.51)

20.20 ± 3.15 (13.31 ~ 27.73)

19.92 ± 3.37 (13.26 ~ 28.00)

0.473

NA

TA(°)

2.66 ± 1.97 (-1.87 ~ 6.34)

2.93 ± 2.28 (-2.86 ~ 7.12)

2.79 ± 2.11 (-1.92 ~ 6.44)

0.587

NA

  1. Data are presented as the mean ± SD. The 2.5 and 97.5 percentiles are indicated in brackets
  2. NA represents no linear relationship or not meeting the condition for linear regression analysis
  3. AFO anterior femoral offset, fAP anteroposterior size of the femur, fML mediolateral size of the femur, LTI Lateral trochlear inclination, MTI medial trochlear inclination, PAL longitudinal length of the articulating surface of the patella, PFO posterior femoral offset, PFT patella facet thickness, PLFW  patella lateral facet width, PLL longitudinal length of the whole patella, PTpatella thickness, PW patella width, SA sulcus angle, TA trochlear angle, tAP anteroposterior size of the tibia, tML mediolateral size of the tibia
  4. p values represent the significant differences between the sexes applying the two-sample t-test for independent samples
  5. p’ values represent the significant differences between the sexes after controlling the bias from age, height, and weight using the multiple variable linear regression model
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BMC Musculoskeletal Disorders

ISSN: 1471-2474

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