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Table 2 Radiological indicators of the prosthesis position for the two groups (postoperatively)

From: Clinical and radiologic outcomes in patients undergoing primary total hip arthroplasty with Collum Femoris Preserving stems: a comparison between the direct anterior approach and the posterior approach

Radiological indicators Group A
(N = 127)
Group B
(N = 121)
Z P
Neck-shaft angle (°) 132.86 ± 4.79 133.35 ± 5.04 0.923b 0.356
Coronal alignment    0.807a 0.668
 Neutral 121 (95.3%) 112 (92.6%)   
 Varus 4 (3.1%) 6 (5.0%)   
 Valgus 2 (1.6%) 3 (2.5%)   
Sagittal alignment    0.772a 0.680
 Neutral 116 (91.3%) 114 (94.2%)   
 Flexed 8 (6.3%) 5 (4.1%)   
 Extended 3 (2.4%) 2 (1.7%)   
Stress shielding (BMD change ratio)
 Gruen zone 1 0.90 ± 0.69 0.89 ± 0.79 1.382b 0.167
 Gruen zone 7 0.85 ± 0.79 0.87 ± 0.75 1.758b 0.079
Anteversion (°) 13.12 ± 2.55 13.16 ± 2.62 0.092b 0.927
neck-preserving ratio (%) 65.44 ± 8.69 66.05 ± 7.37 0.408b 0.683
Acetabular anteversion (°) 26.61 ± 13.99 28.41 ± 14.59 1.132b 0.257
Acetabular inclination angle (°) 48.23 ± 5.83 47.52 ± 5.69 0.520b 0.630
Acetabular depth (mm) 2.97 ± 0.56 2.91 ± 0.65 0.586b 0.558
Anterior-posterior offset (mm) 48.81 ± 6.79 47.53 ± 5.69 1.644b 0.100
Lateral offset (mm) 15.02 ± 6.25 15.34 ± 6.57 0.364b 0.716
Difference in leg length (mm) 3.50 ± 2.79 2.85 ± 2.45 1.880b 0.060
  1. Note: Group A: DAA, group B: PA
  2. aChi-square test, bMann-Whitney U test