Factors that promotes callus formation -
a) Micrornovements between the fracture fragments
b) Appropriate approximation of the fragments
c) Muscle interposed in between the fracture fragment
d) Early initiation of mobilization
e) Ischemia
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- ab
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- a
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- ad
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- bc
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- c
0 voters
WXP:
- Factors that affect callus formation are :-
- Motion at fracture site :- Micromotion at fracture site promotes callus formation, on the other hand no movement at fracture site (as with very rigid fixation) or excessive mobility at fracture site impair callus formation.
- Oxygen tension :- low oxygen tension due to inadequate supply impairs callus formation chondrocytes form excessive chondroid (cartilaginous) tissue in this situation. Mineralization requires adequate oxygen tension and blood supply.
- Compression at fracture site :- Compression at fracture site along with micromovement promotes callus formation. Therefore, distraction at fracture site hampers callus formation.
- Stable fixation (not too rigid) with good approximation of fracture fragments promotes callus formation.
- All causes of nonunion hampers callus formation.