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Table 2 Comparison between stiffness of osteosynthesis with 2C-shaped nails “2C“ (Titanium Nails, Santech Nord® Company) and 2C-shaped nails with 3rd from antero- lateral “3CL” (Titanium Nails, Santech Nord ® Company)

From: Modification of elastic stable intramedullary nailing with a 3rd nail in a femoral spiral fracture model – results of biomechanical testing and a prospective clinical study

  2C-shaped nails “2C“ (n = 8)   3C-shaped nails with 3rd from antero-lateral“3CL” (n = 8)  
  Mean value (SD)   Mean value (SD) p value
3CL more stable than 2C     
Anterior-posterior 0.78 (0.29) N m/mm < 1.23 (0.62) N m/mm 0.007
Internal rotation 0.14 (0.04) N m/° < 0.21 (0.07) N m/° <0.001
Compression 9° (decrease in length) 2.18 (2.37) mm > 0.61 (0.43) mm 0.023
3CL less stable than 2C     
Posterior-anterior 1.78 (1.31) N m/mm > 1.03 (0.97) N m/mm 0.014
External rotation 0.32 (0.18) N m/° > 0.19 (0.12) N m/° 0.004
No statistical significant difference     
Compression 0° (decrease in length) 0.02 (0.03) mm ~ 0.03 (0.03) mm n.s.
Lateral-medial 0.86 (0.33) N m/mm ~ 0.88 (0.30) N m/mm n.s.
Medial - lateral 1.10 (0.40) N m/mm ~ 1.10 (0.53) N m/mm n.s.
  1. The Holm-Bonferroni correction was applied in view of the multiple series of data. Smaller length changes in compression tests reflect a higher stability. Special terms for biomechanical directions corresponding to the most important clinical problems in elastic stable intramedullary nailing of complex fractures: shortening (= compression 9°), recurvation (= anterior-posterior) and varus (= medial-lateral) as the most important clinical problems in elastic stable intramedullary nailing of complex fractures.
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