Table 2 Comparison of accuracy in acetabular cup placement according to type of surgery
Parameter | Simultaneous BTHA (N = 63) | Staged BTHA (N = 60) | P value |
|---|---|---|---|
Mean inclination (°; mean ± SD; range) | |||
First-operated hip | 42.0 ± 6.2 (29.3 to 55.7) | 40.8 ± 7.3 (24.5 to 61.6) | 0.333# |
Second-operated hip | 40.7 ± 5.4 (22.8 to 52.4) | 41.7 ± 7.2 (25.8 to 63.5) | 0.401# |
Mean anteversion (°; mean ± SD; range) | |||
First-operated hip | 16.7 ± 6.9 (2.7 to 30.5) | 17.3 ± 7.5 (4.7 to 36.3) | 0.639# |
Second-operated hip | 17.9 ± 5.2 (7.8 to 30.8) | 17.5 ± 7.7 (3.8 to 34.6) | 0.706# |
Cups within safe zone for inclination (n; %) | |||
First-operated hip | |||
Lewinnek (30° to 50°) | 56 (89) | 51 (85) | 0.522† |
Callanan (30° to 45°) | 42 (67) | 45 (75) | 0.310† |
Second-operated hip | |||
Lewinnek (30° to 50°) | 60 (95) | 51 (85) | 0.056† |
Callanan (30° to 45°) | 51 (81) | 39 (65) | 0.046† |
Cups within safe zone for anteversion (n; %) | |||
First-operated hip | |||
Lewinnek, or Callanan (5° to 25°) | 50 (79) | 47 (78) | 0.889† |
Second-operated hip | |||
Lewinnek, or Callanan (5° to 25°) | 60 (95) | 46 (77) | 0.003† |