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Table 1 Cup and stem size templating accuracy in different conditions

From: Determining the accuracy of preoperative total hip replacement 2D templating using the mediCAD® software

  Patients Cup accuracy (N = 391) Stem accuracy (N = 346)
 ± 0  ± 1  ± 2  ± 0  ± 1  ± 2
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
  1. Bold values are statistically significant values
  2. P value* = Chi-square test
  3. P value** = independent sample T test
  4. ***Significant after post-hoc analysis with corrected Bonferroni P value
  5. ****Not included in the chi-square analysis due to low number of population