Which fixation provides compression and osteogenesis?

Which fixation provides compression and osteogenesis?

• A. External fixation
• B. Kirschner wires
• C. Lag screws and dynamic compression plates
• D. Tension band wiring

Answer: (C)

Direct interfragmentary compression across a fracture promotes primary bone healing (osteogenesis) by providing absolute stability and minimizing motion at the fracture surface. The combination of lag screws with a dynamic compression plate is designed to achieve and maintain that compression: the lag screw is used to create interfragmentary compression by engaging the far cortex while the near cortex is kept clear of threads, so tightening the screw pulls the fragments together. The dynamic compression plate enhances this effect, often through hole design that allows controlled sliding or tightening to translate screw compression into a strong, ongoing press across the fracture. This setup yields a stable construct that favors osteogenesis. Other methods can stabilize a fracture or provide some compression in specific scenarios, but they don’t consistently deliver the same reliable interfragmentary compression and direct bone healing. External frames can compress but depend on frame configuration; Kirschner wires provide limited compression and are mainly for provisional fixation; tension band wiring creates compression in certain patterns but is not the general approach for promoting osteogenesis across a fracture.

Direct interfragmentary compression across a fracture promotes primary bone healing (osteogenesis) by providing absolute stability and minimizing motion at the fracture surface. The combination of lag screws with a dynamic compression plate is designed to achieve and maintain that compression: the lag screw is used to create interfragmentary compression by engaging the far cortex while the near cortex is kept clear of threads, so tightening the screw pulls the fragments together. The dynamic compression plate enhances this effect, often through hole design that allows controlled sliding or tightening to translate screw compression into a strong, ongoing press across the fracture. This setup yields a stable construct that favors osteogenesis.

Other methods can stabilize a fracture or provide some compression in specific scenarios, but they don’t consistently deliver the same reliable interfragmentary compression and direct bone healing. External frames can compress but depend on frame configuration; Kirschner wires provide limited compression and are mainly for provisional fixation; tension band wiring creates compression in certain patterns but is not the general approach for promoting osteogenesis across a fracture.