a trend toward significancep = 0.057
Extension stiffness—calculated from Test 7—was significantly higher in Group 1 (Straight) versus all other groups ( p ≤ 0.015), with a trend toward significance in Group 2 (Nail) versus Group 4 (90°-Helical) ( p = 0.057) and in Group 3 (45°-Helical) versus Group 4 (90°-Helical) ( p = 0.059), and with no significant difference between Group 2 (Nail) and Group 3 (45°-Helical) ( p = 0.989).