Fracture Repair Flashcards
What are the principle forces on bones?
Bending, Torsional, Compressional (axial load) and distraction
Name the 3 goals of fracture repair
- Decrease pain
- Return to function
- Alignment
What are some of the initial fracture repair principles? Is there anything else you should consider?
Initially the principles focused on: anatomical reduction, stable fixation, preservation of the blood supply and early active movements. It important to consider the soft tissues and bone as most of the blood supply to the bone comes from the soft tissues, we don’t want to place too much emphasis on mechanics.
Locking plates have a rigid construct with a __ screw to bone interface. They are ___ making them less traumatic and more versatile and lock if at all possible. You cannot __ them
Stronger, monocortical, angle
Non locking plates are __ used because they cause more __ as bicortical screws. They may really only be used if you need to __ the screw
Rarely, trauma, angle
What are the disadvantages of monocoritcal locking screws/plates?
The torsion stability is compromised and the increase d risk of screw pullout in thin cortices (Metaphyseal bone)
What are the advantages of monocortical screws/plates?
They have reduced vascular damage and are more versatile
Stress =
Force/Unit Area
Strain = ?
Change in Length / Original Length
How could you maximize blood supply while repairing a fracture?
Use monocortical screws and don’t place screws excessively or “too strong”.
Interlocking nails can be placed __ , are very ___, heal __ , and preserve ____.
Closed, stable, very well, blood supply
What bones can interlocking nails be used in?
Femur, Humerus, Tibia
Bending moment =
F x D (distance from force to implant)
T/F: Bending moment for plate greater to force being applied over larger distance
T
