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Table 3 Intraoperative and postoperative radiological data comparing the procedure using a conventional jig and computer-assisted surgery

From: Effect of surgical experience on imageless computer-assisted femoral component positioning in hip resurfacing – a preclinical study

  Conventional Computer-assisted surgery P value
Time (min) 14 ± 5 (7–29) 18 ± 6 (11–33) 0.028
Frontal plane    
Deviation (°) 7.4 ± 4.4 (–17– 5) 1 ± 1.7 (–8–3) <0.01
Outliers > 5° 15 (55.6%) 1 (3.7%) <0.01
Implanted in:    
Planned angle 0 13 (48.1%) n.a.
Varus alignment 20 (74.1%); 8.8 ± 4.3° 4 (14.8%); 3.5 ± 3.3° n.a.
Valgus alignment 7 (25.9%); 3.4 ± 1.3° 10 (37.0%); 1.4 ± 0.7° n.a.
Deviation analyzing different bone morphologies:  
Physiological 7.0 ± 3.6° 1.4 ± 2.8° <0.01
Osteoarthritis 8.1 ± 4.7° 0.6 ± 0.5° <0.01
SCFE 7.0 ± 5.0° 1.1 ± 1.1° <0.01
Axial plane    
Deviation (°) 5.1 ± 3.1 (–12–9) 3.9 ± 2.9 (–8–10) 0.13
Outliers > 5° 12 (44.4%) 8 (29.6%) 0.26
Implanted in:    
Planned angle 3 (11.1%) 1 (3.7%) n.a
Anteversion 12 (44.4%); 6.0 ± 2.2° 20 (74.1%); 4.4 ± 2.8° n.a.
Retroversion 12 (44.4%); 5.4 ± 3.2° 6 (22.2%); 2.8 ± 2.8° n.a
Deviation analyzing different bone morphologies (°):
Physiological 5.0 ± 3.7 2.5 ± 1.7 n.a.
Osteoarthritis 5.8 ± 1.9 6.3 ± 2.6 n.a.
SCFE 4.4 ± 3.6 2.8 ± 2.5 n.a.
Notching 8 (29.6%) 0 <0.01
  1. Mean ± standard deviation (range). Deviation describes the difference between planned postoperative stem shaft angle.