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Table 1 Results of mean torsional resistance for studied stem diameters and diaphyseal contact depths. Group Mean Torsional Resistance Data *

From: Stem diameter and rotational stability in revision total hip arthroplasty: a biomechanical analysis

Size 18:   40 um 50 um 100 um 150 um ε
4 cm Mean: 18.94 21.48 29.56 32.32 0.3972
  SD: 2.51 1.97 5.17 8.02 0.0939
3 cm Mean: 16.87 19.96 26.21 25.8 0.3398
  SD: 1.26 2.49 5.15 5.82 0.0695
2 cm Mean: 11.39 13.04 20.31 23.02 0.2532
  SD: 7.42 9.16 15.38 15.54 0.1666
Size 15:   40 um 50 um 100 um 150 um ε
4 cm Mean: 13.24 15.43 21.54 23.2 0.2378
  SD: 2.67 2.85 4.34 6.14 0.0741
3 cm Mean: 10.69 13.26 23.41 27.49 0.258
  SD: 3.36 4.5 8.13 7.16 0.086
2 cm Mean: 7 8.07 13.07 17.66 0.0958
  SD: 1.58 1.79 2.34 3.16 0.0242
  1. * all units are Newton-meters (Nm) except interface stiffness
  2. ε = interface stiffness (um/Nm)