Fracture neck femur cause of non-union-
Ans. is 'a' i.e., Injury to blood supply with shearing stresso Causes of non-union in fracture neck of femur are :-Fracture morphology - high fracture angle and increased shear.Displaced fracture grade 3/4.Fracture comminution.Inadequate reduction and stability of fixation.Poor bone quality.Injury to vascularity- direct and tamponade effect.Absence of cambium layer in periosteum.Factors in synovial fluid which inhibit the callus formation.Lack of hematoma.Washing away and dilution of osteogenic factors.
Injury to blood supply with shearing stress
Poor nutrition of the patient
Smoking
Old age and osteoporosis
Fracture Neck of Femur