In some old fractures

NEET PG Orthopaedics
#1

In some old fractures, cartilaginous tissue forms over the fractured bone ends with a cavity in between containing clear fluid. This condition is called as -

    1. Delayed union
    1. Slow union
    1. Nonunion
    1. Pseudoarthrosis

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EXP:

  • Pseudarthrosis develop after a fracture that has not united due to inadequate immobilization, i.e. Pseudarthrosis is a type of nonunion.
  • Inadequate immobilization permits constant movement at fracture site which hampers the formation of normal callus, and fibroblast forms excessive fibrous tissue in this situation which results in non-union.
  • If movement continues to occur at non-union site, the fracture site develops features of a joint,i.e. Pseudarthrosis:-
  • Covered by a cartilage (fibro cartilage)
  • There is synovial lining
  • Space is filled with synovial fluid like clear fluid
  • Mobility