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Table 1 Contact area on the grafts in the 2 groups A-Type and C-Type showing the effects of different fixation techniques from posterior, anterior or combined instrumentations

From: Compression and contact area of anterior strut grafts in spinal instrumentation: a biomechanical study

Group IF AR/IF IF + PC AR
A-Type     
Mean (mm 2 ) 449 540 # 533 # 490
SD 72 67 45 68
% of max. (SD) 75 (12) 90 (11) 89 (8) 82 (11)
C-Type     
Mean (mm 2 ) 318 * 521 # 308 * 435
SD 90 60 88 89
% of max. (SD) 53 (15) 87 (14) 51 (15) 73 (15)
  1. Mean and Standard deviation, percentage calculated on the base of a theoretical maximum of 600 mm2 on the graft. # vs. IF in the same group P < 0.05, * vs. corresponding fixation in group A-Type p < 0.01.