Official Journal of the Italian Society of Orthopaedics and Traumatology
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) |