MSC Week 5 Trauma/Shoulder Questions with correct answers

Principles of AO - ANSWER-Anatomical reduction, Stable internal fixation, preservation of blood supply, early mobilization Fixation - 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 - 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 - ANSWER-Headed/Headless, Fully or partially threaded, Self tapping or self drilling tip, Thread pitch is distance between threads. Cancellous Screws - ANSWER-Larger thread to cut through SOFT bone. Large thread height and large thread pitch. Corticol Screws - ANSWER-Smaller threads because of hard corticol bone. Short thread forms. Short thread height and a short thread pitch. Hollow and solid screws - ANSWER-Hollow provide guidance for k-wires. Solid are stronger than hollow. Cannulated screws - ANSWER-Utilize a k-wire/guide pin. Typically self-drilling 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 - ANS