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Table 1 Comparison between stiffness of osteosynthesis with 2C-shaped nails “2C“ (Titanium Nails, Santech Nord® Company) and 2C-shaped nails with 3rd from antero- medial “3CM” (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-medial“3CM” (n = 8)  
  Mean value (SD)   Mean value (SD) p value
No statistical significant difference     
Anterior-posterior 0.78 (0.29) N m/mm ~ 0.66 (0.32) N m/mm n.s.
Posterior-anterior 1.78 (1.31) N m/mm ~ 2.87 (2.01) N m/mm n.s.
Lateral-medial 0.86 (0.33) N m/mm ~ 0.71 (0.23) N m/mm n.s.
Medial-lateral 1.10 (0.40) N m/mm ~ 1.09 (0.47) N m/mm n.s.
External rotation 0.32 (0.18) N m/° ~ 0.30 (0.13) N m/° n.s.
Internal rotation 0.14 (0.04) N m/° ~ 0.14 (0.03) N m/° n.s.
Compression 0° (decrease in length) 0.02 (0.03) mm ~ 0.02 (0.01) mm n.s.
Compression 9° (decrease in length) 2.18 (2.37) mm ~ 1.54 (1.24) mm n.s.
  1. 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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