Measurement of forces generated during distraction of growing-rods in early onset scoliosis

Table 1 Spinal deformity angles

	Mean	SD	P value (t - test)
Pre-distraction PA cobb	53.8	19.9
Post-distraction PA cobb	50.2	20	0.003
Pre-distraction Lat cobb	46.2	13.7
Post-distraction Lat cobb	41.8	13.5	0.006
Rods distraction (mm)	19.2	4.4

Table 2 Force/distraction values

Distraction (mm)	Min. load (N)	Mean load (N)	Max. load (N)
1 (min)	-32 (min)	133 (min)	311 (min)
2	30	203	394
3	141	247	447
4	167	282	465
5	172	308	447
6	201	354	552 (max)
7	246	364	428
8	222	354	440
9	303	402	461
10	342	430	497
11	370	404	445
12 (max)	472 (max)	485 (max)	498