Table 1 Cup and stem size templating accuracy in different conditions

Total

391 (100%)

28.9%

63.9%

83.1%

27.2%

61.0%

78.6%

Nominal variables

Year

 2018

67 (17.1%)

26.9%

61.2%

82.1%

32.7%

75.0%

88.5%

 2019

122 (31.2%)

33.6%

66.4%

86.9%

28.2%

60.0%

82.7%

 2020

139 (35.5%)

26.6%

63.3%

80.6%

23.8%

54.8%

71.4%

 2021

63 (16.1%)

27%

63.5%

82.5%

27.6%

63.8%

77.6%

 P value*

0.590

0.904

0.585

0.663

0.087

0.046 (post-hoc analysis revealed no significance)

Gender

 Male

193 (49.4%)

30.1%

65.8%

85.0%

20.8%

53.8%

76.3%

 Female

198 (50.6%)

27.8%

62.1%

81.3%

33.5%

68.2%

80.9%

 P value*

0.620

0.448

0.334

0.008

0.006

0.294

Indication for surgery

 AVN

100 (25.6%)

24.0%

69.0%

83.0%

18.8%

49.0%

70.8%

 DDH

198 (50.6%)

31.8%

65.7%

86.9%

32.2%

70.7%***

84.5%

 DJD

37 (9.5%)

27.0%

64.9%

81.1%

28.6%

60.7%

75.0%

 Fracture

19 (4.9%)

21.1%

47.4%

84.2%

23.5%

58.8%

70.6%

 Revision

24 (6.1%)

41.7%

54.2%

62.5%***

22.2%

44.4%

72.2%

 Other (acetabular fracture N = 1, hip fusion N = 2, hemophilia DJD N = 1, perthes N = 6, septic arthritis N = 3)

13 (3.3%)

15.4%

38.5%

69.2%

30.8%

46.2%

84.6%

 P value*

0.339

0.141

0.048

0.297

0.007

0.126

Stem brand (N = 391, 346 was considered for accuracy estimation)

 Fitmore^®

120 (27.8%)

22.5%

65.0%

84.2%

21.2%

45.2%***

71.2%

 Fitmore^® extended

71 (16.5%)

26.8%

62.0%

84.5%

25.7%

60.0%

77.1%

 M/L taper

51 (11.8%)

29.4%

62.7%

86.3%

34.8%

67.4%

82.6%

 Wagner Cone^®

48 (11.1%)

52.1%***

72.9%

87.5%

41.7%

81.3%***

91.7%

 Accolade^® ****

11 (2.6%)

9.1%

36.4%

72.7%

–

–

–

 CORAIL^®

61 (14.2%)

24.6%

67.2%

82.0%

23.7%

72.9%

83.1%

 Müller™ ****

2 (0.5%)

0.0%

100.0%

100.0%

–

–

–

 Wagner SL revision^®

21 (4.9%)

38.1%

42.9%

61.9%

21.1%

47.4%

68.4%

 Unknown brand (lack of data)

6 (1.5%)

–

–

–

–

–

–

 P value*

0.006

0.153

0.321

0.104

0.001 < 

0.058

Cup brand

 Continuum^®

226 (52.4%)

31.4%

60.2%

82.3%

30.1%

61.2%

78.5%

 PINNACLE^®

63 (14.6%)

25.4%

66.7%

81.0%

23.0%

72.1%

82.0%

 Trident^®

11 (2.6%)

9.1%

36.4%

72.7%

–

–

–

 Trilogy^®

81 (18.8%)

28.4%

76.5%

88.9%

25.4%

49.3%

77.6%

 Trilogy^® IT

7 (1.6%)

14.3%

57.1%

85.7%

0.0%

57.1%

57.1%

 Other (cage N = 1, shell N = 1, Dual mobility N = 1)

3 (0.7%)

33.3%

66.7%

66.7%

0.0%

100.0%

100.0%

P value*

0.558

0.052

0.593

0.292

0.078

0.572

Continuous variables (mean of variable in the accurate group versus inaccurate group)

Age (mean ± SD)

44.7 ± 13.8 versus 42.8 ± 15.3

43.9 ± 14.1 versus 42.3 ± 16.3

43.5 ± 14.8 versus 42.2 ± 15.5

41.2 ± 14.2 versus 43.4 ± 15.0

42.2 ± 14.6 versus 43.8 ± 15.1

42.5 ± 14.7 versus 44.1 ± 15.2

 P value**

0.252

0.332

0.508

0.216

0.313

0.410

BMI (Kg m⁻², mean)

25.0 ± 4.0 versus 24.5 ± 4.5

24.4 ± 4.2 versus 25.0 ± 4.6

24.5 ± 4.4 versus 25.2 ± 4.3

24.5 ± 4.3 versus 24.6 ± 4.3

24.5 ± 3.9 versus 24.5 ± 4.6

24.4 ± 4.4 versus 24.9 ± 3.8

 P value**

0.249

0.183

0.243

0.919

0.972

0.428

Cup diameter (mm, mean)

51.2 ± 4.5 versus 52.5 ± 4.1

51.9 ± 4.1 versus 52.5 ± 5.6

52.0 ± 4.2 versus 52.6 ± 4.7

51.1 ± 4.4 versus 52.5 ± 4.2

51.5 ± 4.4 versus 53.1 ± 3.9

51.8 ± 4.4 versus 53.2 ± 3.8

 P value**

0.007

0.195

0.346

0.008

0.001 > 

0.012