Table 2.

Data obtained from mehanical testing

	Pre-operative group	Peri-operative group
Mean modulus of elasticity (Pa)
Intervention	5.88 × 108	5.65 × 108
Control	5.92 × 108	4.62 × 108
p value	0.97	0.32
Mean energy at yield
Intervention	2.45 × 107	2.73 × 107
Control	3.14 × 107	3.92 × 107
p value	0.31	0.01
Mean yield stress
Intervention	1.64 × 107	1.68 × 107
Control	1.63 × 107	1.89 × 107
p value	0.94	0.39
Mean yield strain
Intervention	3.2 × 10−2	3.7 × 10−2
Control	3.7 × 10−2	5.2 × 10−2
p value	0.44	0.01
Mean energy at failure
Intervention	4.92 × 107	5.25 × 107
Control	5.48 × 107	6.41 × 107
p value	0.59	0.27
Mean failure stress
Intervention	1.95 × 107	1.89 × 107
Control	1.87 × 107	1.98 × 10
p value	0.71	0.67
Mean failure strain
Intervention	4.7 × 10−2	5.2 × 10−2
Control	5.4 × 10−2	6.4 × 10−2
p value	0.41	0.11
Mean postyield energy
Intervention	5.63 × 107	2.51 × 107
Control	2.34 × 107	2.48 × 107
p value	0.31	0.97