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Table 1 The stresses in bone at the corresponding points in brackets (s. Figure  4 ) at different wedge openings

From: Comparison of theoretical fixation stability of three devices employed in medial opening wedge high tibial osteotomy: a finite element analysis

Fixation Wedge opening (mm) maxσz(tensile stress) minσz(compression stress) maxσx(tensile stress) minσx(compression stress) maxσy(tensile stress) minσy(compression stress) Misσ (shear von Mises stress)
First generation Puddu plate 7.5 8.0 (a) −23.7 (b) 15.9 (a) −6.6 (a) 15.1 (c) −35.9 (b) 45.8 (b)
10.5 3.6 (a) −27.2 (b) 11.4 (a) −19.9 (b) 14.7 (c) −40.7 (b) 39.6 (b)
12.5 4.4 (c) −28.0 (b) 11.6 (a) −22.4 (b) 12.9 (c) −40.0 (b) 40.5 (b)
17.5 4.8 (c) −27.1 (b) 11.9 (a) −17.9 (b) 12.4 (c) −38.5 (b) 50.9 (b)
  22.5 3.0 (c) −26.9 (a) 11.5 (a) −6.6 (a) 8.9 (c) −26.1 (b) 29.2 (b)
Second generation Puddu plate 7.5 3.3 (a) −25.9 (b) 10.8 (a) −15.3 (b) 6.8 (c) −34.4 (b) 23.6 (b)
10.5 3.5 (a) −27.3 (b) 10.9 (a) −18.0 (b) 8.5 (c) −32.2 (b) 38.4 (b)
12.5 3.4 (a) −29.1 (b) 10.9 (a) −19.2 (b) 7.0 (c) −33.9 (b) 39.5 (b)
17.5 3.3 (a) −29.9 (b) 11.4 (a) −18.5 (b) 8.1 (c) −31.2 (b) 40.5 (b)
  22.5 2.6 (c) −26.1 (a) 10.9 (a) −6.4 (a) 5.8 (c) −25.4 (b) 29.9 (b)
TomoFix plate with bone graft 7.5 7.1 (c) −23.6 (a) 12.4 (a) −6.4 (d) 6.2 (c) −10.6 (d) 25.4 (a)
10.5 12.9 (c) −29.9 (a) 8.88 (a) −5.9 (d) 5.4 (c) −10.4 (d) 32.0 (a)
12.5 6.7 (c) −29.9 (a) 9.16 (a) −5.8 (d) 4.4 (c) −10.4 (d) 32.7 (a)
17.5 7.7 (c) −20.5 (a) 9.68 (a) −6.3 (d) 5.4 (c) −11.1 (d) 23.0 (a)
  22.5 5.6 (d) −23.8 (a) 11.0 (a) −6.1 (d) 4.7 (c) −11.6 (d) 27.2 (a)
TomoFix plate without bone graft 7.5 21.1 (a) −25.8 (a) 13.2 (a) −7.2 (d) 8.6 (c) −12.9 (d) 25.8 (a)
10.5 7.8 (c) −33.2 (a) 13.8 (a) −7.6 (d) 4.8 (c) −13.4 (d) 31.3 (a)
12.5 6.7 (c) −32.7 (a) 13.9 (a) −7.3 (d) 7.0 (c) −13.2 (d) 31.5 (a)
17.5 6.1 (c) −31.4 (a) 11.4 (a) −6.5 (d) 7.5 (c) −14.1 (d) 31.7 (a)
  22.5 14.8 (a) −24.1 (a) 13.4 (a) −7.4 (c) 5.7 (c) −14.9 (d) 25.7 (a)