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Table 2

Average anteversion and inclination angles of each group.

Variables rTHA
cTHA
t (p-value)
Mean ± SD Mean ± SD
Preoperative period
 Anteversion 19.4 ± 1.5° 17.6 ± 6.4° 1.8 (0.08)
 Inclination 40.0 ± 0.3° 43.1 ± 5.1° −4.0 (<0.001)
Robot-assisted intraoperative period
 Anteversion 19.9 ± 2.8°
 Inclination 40.2 ± 2.7°
Postoperative period
 Sagittal version 24.8 ± 6.4° 27.5 ± 11.9° −1.34 (0.17)
 Anteversion 28.7 ± 7.0° 31.1 ± 8.3° −1.69 (0.10)
 Inclination 40.7 ± 4.0° 41.3 ± 7.1° −0.52 (0.61)
p-value Preop vs. post-op measure (inclination) 0.07 0.12
p-value Preop vs. intra-op measure (inclination) 0.54
p-value Preop vs. post-op measure (anteversion) <0.001 <0.001
p-value Preop vs. intra-op measure (anteversion) 0.43
Absolute difference
 Postoperative CT – preoperative anteversion 9.3 ± 7.1° 13.5 ± 11.7° −2.22 (0.03)
 Postoperative CT – preoperative inclination 0.7 ± 4.0° −1.8 ± 7.4° 2.11 (0.04)

SD = Standard deviation; rTHA = robotic-assisted total hip arthroplasty; cTHA = conventional total hip arthroplasty; CT = computerised tomography scan of the hip; Preop = preoperative post-op = postoperative; intra-op =intra-operative measurement.

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