In some old fractures, cailaginous tissue forms over the fractured bone ends with a cavity in between containing clear fluid. This condition is called as:
Correct Answer: Pseudoahrosis
Description: D i.e. Pseudoahrosis Pseudoahrosis It is a false joint that may develop after a fracture that has not united properly due to inadequate immobilization.- Inadequate immobilization permits constant movement at the fracture site so that the normal constituents of callus do not form consequently the callus may be composed mainly of fibrous tissue cailage, perpetuating the instability and resulting in delayed union or nonunion. If a nonunion allows for too much motion along the fracture gap, the central poion of the callus undergoes cystic degeneration and the lumina] surface can actually become lined by synol like cells, creating a false joint filled with clear fluidQ Causes of Pseudoahrosis (in decreasing order of frequency) are1. NeurofibromatosisQ (50% patients of pseudoahrosis have NF)2. Nonunion of fractureQ (including pathological fractures)3. Congenital (mostly in lower to middle third of tibia with cupping of proximal bone end & pointing of distal bone end)4. IdiopathicQ5. Osteogenesis imperfecta6. Fibrous dysplasia7. Cleidocranial dysplasia8. Ankylosing spondylitis (in fused bamboo spine)9. Post surgical eg. triple ahrodesis, spinal fusion etc. as a complication.
Category:
Surgery
Get More
Subject Mock Tests
Practice with over 200,000 questions from various medical subjects and improve your knowledge.
Attempt a mock test nowMock Exam
Take an exam with 100 random questions selected from all subjects to test your knowledge.
Coming SoonGet More
Subject Mock Tests
Try practicing mock tests with over 200,000 questions from various medical subjects.
Attempt a mock test now