This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pelvis and Hip injuries, Subject name: Orthopaedics
[{'content': 'Complication of neck femur fracture are all except- \nSelect and explain. \nA. Nonunion, B. Malunion, C. AVN, D. Osteoahritis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: *Impoant complications of fracture femoral neck are AVN of femoral head ( most common ), nonunion and secondary osteoahritis. *AVN is the most common complication of femoral neck fracture. M/c affects => Femoral Head M/c site => Anterolateral aspect (Being principal Wt. bearing poion) Incidence&;d/t t Steroid usage & Trauma AVN only occurs in FATTY MARROW, which contains a Sparse vascular supply. In contrast to Hematopoietic marrow which has a rich blood supply CAUSES * Trauma * Alcohol consumption * Coicosteroid intake * Gout and hyperuricemia * Hypercholesterolemia * Hypercoagulable states Hypercoisolism * Hyperlipidemia * Cushing disease * Hyperparathyroidism * Hemoglobinopathies * Intravascular coagulation (SCD;Hb S/C;Polycythemia) * Organ transplantation * Caisson disease * Pregnancy (Dysbaric osteonecrosis) * Congenital dislocation Hip * Pancreatitis * Ehlers-Danlos synd * Neoplasms * Heredity dysostosis * CRF * Legg-Calve-Pehes dis * Hemodialysis * Fabry disease * Cigarette smoking * Gaucher disease * Collagen Vascular dis * Giant cell aeritis * SLE * Thrombophlebitis * Idiopathic Ref: Essential of ohopedics surgery maheswari 9th ed p.426', 'role': 'assistant'}]