Caring for Muscle and Bone Injuries Questions taken from Chapter 19 of Emergency Medical Responder - First on Scene (9th Edition) Progress Indicator: Question 1 of 20 1.  How far past the midthigh should the splints extend when immobilizing a bent knee? Choices: 2 to 4 inches (5 cm to 10 cm) 6 to 12 inches (15 cm to 30 cm) 3 to 7 inches (7 cm to 17 cm) 5 to 10 inches (12 cm to 25 cm)