MSC Week 5 Trauma/Shoulder Actual Exam with Correct Answers

MSC Week 5 Trauma/Shoulder Actual Exam with Correct Answers Principles of AO - CORRECT ANSWER-Anatomical reduction, Stable internal fixation, preservation of blood supply, early mobilization Fixation - CORRECT ANSWER-External fixation is a temporary solution for trauma. Internal can be temporary or permanent. Helps fuse or heal fracture sites. Principles of plate fixation - CORRECT ANSWER-The tension band. Conversion of tensile forces to compression forces on the convex side of loaded bone. Screw generally should not be placed less than 1 cm (10mm) from fracture line. Device screw features - CORRECT ANSWER-Headed/Headless, Fully or partially threaded, Self tapping or self drilling tip, Thread pitch is distance between threads. Cancellous Screws - CORRECT ANSWER-Larger thread to cut through SOFT bone. Large thread height and large thread pitch. Corticol Screws - CORRECT ANSWER-Smaller threads because of hard corticol bone. Short thread forms. Short thread height and a short thread pitch. Hollow and solid screws - CORRECT ANSWER-Hollow provide guidance for k-wires. Solid are stronger than hollow. Cannulated screws - CORRECT ANSWER-Utilize a k-wire/guide pin. Typically selfdrilling and self-tapping. Both headed and headless types provide compression at the fracture site. Length is determined by placing gauge over k-wire. Headless screws - CORRECT ANSWER-Both ends with threads, middle without. Always cannulated. Headed screws - CORRECT ANSWER-Certain proportion to shaft. Contacts bone to outside. Self-tapping screws - CORRECT ANSWER-Designed to cut pattern into bone. Self-drilling screws - CORRECT ANSWER-No need to drill pathway. Blunt tip screws - CORRECT ANSWER-Used for soft tissue protection