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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)