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Table 3 Radiographic evaluation of the angles

From: No added value for Computer-Assisted surgery to improve femoral component positioning and Patient Reported Outcomes in Hip Resurfacing Arthroplasty; a multi-center randomized controlled trial

  Radiographic evaluation angles (shown as intention to treat) Radiographic evaluation angles (shown per protocol)
CAS (n = 61) Conventional
(n = 61)
P Value CAS (n = 50) Conventional
(n = 70)
P Value
CCD-Angle, degrees (SD: range) 129,5 (6.1: 117–143) 128,6 (6.5: 115–149) 0.443 129,2 (6.1: 117–143) 128,9 (6.5: 115–149) 0.780
Preplanned SSA, degrees (SD: range) 138,3 (3.8: 128–148) 136,6 (4,8: 127–152) 0.033* 138,0 (3.8: 128–148) 137,1 (4,7: 127–152) 0.281
Post-operative SSA, degrees (SD: range) 136,0 (5.7: 124–150) 134,9 (6,7: 119–153) 0.311 136,3 (5.6: 124–150) 134,8 (6,6: 119–153) 0.196
Difference postoperative SSA minus preplanned SSA
 - Mean, degrees (SD: range) −2.26 (5.8: −15.25 –12.11) −1.75 (5.9: − 13.14 –16.21) 0.636 − 1.7 (5.9: − 15.25 – 12.11) − 2.2 (5.8: − 13.14 – 16.21) 0.592
 - Absolute, degrees (SD: range) 5.14 (3.5: 0.07–15.25) 4.94 (3.5: 0.04–16.21) 0.768 5.0 (3.5) 5.0 (3.5) 0.932
 - > 3 degrees, n (%) 44 (72%) 40 (66%) 0.558 35 (70%) 44 (61%) 0.692
 - > 7 degrees, n (%) 18 (29%) 19 (31%) 0.884 12 (24%) 20 (28%) 0.534
 - > 10 degrees, n (%) 6 (10%) 4 (7%) 0.517 05 (10%) 10 (14%) 0.586
  1. CAS = Computer-Assisted-Surgery, CCD = Centrum-Collum-Diaphysis, SSA = Stem-Shaft-Angle.* significant difference