Fig. 2From: Pre-operative knee extensor and flexor torque after secondary ACL rupture: a comparative retrospective analysisPre-operative normalized knee extension A and flexion B torque (Nm/kg body weight) of the non-injured leg. Bars show the mean and error-bars standard error. Points indicate the tendon type (n = 69). Filled and colored dots represent primary tendon grafts; * indicates significant differences following one-way ANOVA (p < 0.05); BTB = bone-to-bone, ST = Semitendinosus, BW = body weightBack to article page