This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hand Injuries, Subject name: Orthopaedics
Nonunion is common in fracture - 
Select and explain. 
A. Scapula, B. Talus, C. Neck femur, D. None
C: Neck femur
Answer: C: Neck femur 
Explanation: Ans. is 'c' i.e., Neck femurNon-uniono When a fracture fails to unit completely even after the stipulated time, it is termed as non-union,o Both, In non-union and delayed union, fracture does not unite in the usual stipulated time. The difference between two is that :-In delayed union, union occurs but at a slower rate, i.e. there is presence of clinical and radiological progressive signs of union though at a slower rate. Healing may occur without surgical intervention by just prolonging the duration of immobilization.In non-union, union does not occur at all, i.e. there is complete cessation of healing process in which fibrous tissue is never replaced by bony matrix. So, there is absence of clinical and radiological progressive signs of union. Fracture healing will not occur without surgical intervention, e.g. bone grafting, illizarov's technique.o Common sites of non-union are neck offemur, scaphoidlower third of tibia, lateral condyle of humerus and lower third of ulna.