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Review Question - QID 512

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QID 512 (Type "512" in App Search)
Figure A is a radiograph taken after an open reduction and internal fixation of a periprosthetic distal femur fracture. With this type of hybrid locked plate fixation, what is the difference between screw A and screw B?
  • A

Screw A can assist in fracture reduction while screw B provides a fixed angle support

18%

196/1088

Screw A provides improved axial stiffness while screw B provides a fixed angle support

11%

122/1088

Screw A can be used to reduce the plate to bone while screw B can be used to lag fracture fragments together

3%

30/1088

Screw A provides a fixed angle support while screw B can be used to reduce the plate to the bone

64%

691/1088

Screw A can be used to lag fracture fragments together and screw B increases the plate bone frictional stability

4%

39/1088

  • A

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Locking screws provide a fixed angle support and can improve fixation in osteoporotic bone while nonlocking screws can be used to reduce the plate to the bone, lag fracture fragments together and increase the plate bone frictional stability. "Hybrid" locked plate fixation utilizes both screw types in order to assist with difficult fracture fixation such as when there is a short metaphyseal segment and osteoporotic bone.

Zura et al discusses the biomechanical and biological advantages offered by locked plate fixation.

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