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Official Journal of the Italian Society of Orthopaedics and Traumatology

Table 1 The native hip morphology was described using several CT-based measurements (mean ± standard deviation; median in parentheses): the features that are correlated with the Crowe classification are shown in bold (LT lesser trochanter)

From: Which stem in total hip arthroplasty for developmental hip dysplasia? A comparative study using a 3D CT-based software for pre-operative surgical planning

Feature of the native hip morphology

Crowe classification

Spearman ρ (p value)

I (92 hips)

II (62 hips)

III (37 hips)

IV (9 hips)

Center of rotation height (mm)

17.98 ± 5.20 (18)

22.08 ± 6.42 (21)

28.84 ± 6.24 (30)

43.44 ± 9.62 (42)

0.598 (p < 0.0001)

Neck-shaft angle (°)

128.47 ± 13.56 (129.5)

130.43 ± 14.80 (132)

136.11 ± 15.94 (138)

128.22 ± 23.68 (132)

0.167 (p = 0.018)

Femoral offset (mm)

31.90 ± 8.18 (33)

30.29 ± 7.09 (30)

25.97 ± 6.78 (25)

24.11 ± 9.31 (22)

− 0.295 (p < 0.0001)

Acetabular offset (mm)

34.79 ± 4.61 (35)

36.27 ± 5.99 (36)

35.00 ± 6.36 (34)

39.00 ± 4.06 (39)

0.109 (p = 0.121)

Axial diameter of acetabular cavity (mm)

46.41 ± 4.73 (46)

46.52 ± 5.22 (46)

45.62 ± 5.29 (46)

39.56 ± 9.10 (44)

− 0.096 (p = 0.172)

Acetabular anteversion (°)

19.80 ± 7.24 (20)

17.31 ± 9.04 (18)

14.03 ± 9.69 (14)

14.67 ± 10.72 (16)

− 0.243 (p = 0.0005)

Femoral anteversion (°)

25.55 ± 17.01 (24.5)

38.77 ± 18.23 (40.5)

35.86 ± 19.28 (36)

49.44 ± 20.52 (42)

0.338 (p < 0.0001)

Angle between calcar femorale and posterior condyles (°)

35.64 ± 17.04 (35)

45.11 ± 17.00 (46.5)

42.70 ± 20.00 (45)

56.38 ± 32.24 (53)

0.214 (p = 0.002)

Leg length discrepancy (mm)

− 3.04 ± 12.38 (0)

− 11.64 ± 13.00 (− 10)

− 12.43 ± 15.39 (− 15)

− 27.67 ± 20.95 (− 26)

− 0.389 (p < 0.0001)

Mediolateral femoral diameter 2 cm above the LT (mm)

43.03 ± 6.47 (43)

41.44 ± 6.53 (42)

37.03 ± 6.39 (37)

34.56 ± 4.90 (34)

− 0.346 (p < 0.0001)

Mediolateral femoral diameter at LT (mm)

24.24 ± 4.44 (24)

24.16 ± 4.52 (24)

22.51 ± 4.16 (22)

22.11 ± 3.02 (22)

− 0.114 (p = 0.105)

Mediolateral femoral diameter at isthmus (mm)

9.50 ± 1.84 (10)

9.92 ± 1.91 (10)

10.68 ± 2.43 (11)

9.67 ± 2.12 (9)

0.143 (p = 0.042)

Isthmus position (from LT) (mm)

114.88 ± 19.18 (116)

117.92 ± 12.67 (118)

114.24 ± 17.91 (113)

108.44 ± 10.25 (109)

− 0.066 (p = 0.346)

Canal flare index

4.67 ± 1.05 (4.5)

4.30 ± 0.91 (4.35)

4.45 ± 4.75 (3.7)

3.76 ± 0.80 (3.8)

− 0.324 (p < 0.0001)