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MSC Week 5 Trauma_Shoulder Questions with correct answers
MSC Week 5 Trauma_Shoulder Questions with correct answers
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MSC Week 5 Trauma/Shoulder Questionswith 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 - ANSWER-Both ends with threads, middle without. Always
cannulated.
Headed screws - ANSWER-Certain proportion to shaft. Contacts bone to outside.
, Self-tapping screws - ANSWER-Designed to cut pattern into bone.
Self-drilling screws - ANSWER-No need to drill pathway.
Blunt tip screws - ANSWER-Used for soft tissue protection.
Solid core screw - ANSWER-Basic orthopedic screw; typically fully threaded and
self-tapping. Instruments used are bone forceps, drill guide, drill bit, depth gauge,
screw driver.
Screw and Drill bit sizing - ANSWER-Screw sizing is the thread major diameter
and overall length. Principle drill replicates the minor thread diameter. Over drill
bit size corresponds to the major thread diameter. Allows fully threaded screw to
be used as a partially threaded screw when the near fragment is drilled.
Lag Screw - ANSWER-Most effective compression between 2 bone fragments.
Pulls fragments together producing pressure across the fracture line. Purchase is
acheieved on the distal fragments while being able to turn freely to proximal
fragment.
Clinical application of lag screws - ANSWER-Used to compress fractures. Used
to hold plates on bone. Threads only engage FAR cortex.
Headless/Herbert screw - ANSWER-Cannulated. Interfragmentary compression.
Threads at both ends.
What are the materials for screws? - ANSWER-Stainless steel; titanium
Straight, compression, non-locking plates - ANSWER-Chamfered, non-threaded
screw holes. Used to be go-to plate choice.
Contoured, anatomic, periangular, locking plate - ANSWER-Threaded screw
holes. Unique shape and profile for indicated bone. Used today.
What are the categories of plates? - ANSWER-Compression, locking,
neutralizing, buttress, bridging, specialty
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