This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
Most common complication of mid shaft humerus fracture is ? 
Select and explain. 
A. Radial nerve palsy, B. Median nerve palsy, C. Nonunion, D. Malunion
A: Radial nerve palsy
Answer: A: Radial nerve palsy 
Explanation: Ans. is 'a' i.e., Radial nerve palsy Complications of humerus shaft fracture Nerve injury : - Radial nerve is the most commonly injured nerve in fracture shaft humerus. It is paicularly common in oblique fractures at the junction of middle and distal third of the bone (Holstein- Lews fracture). Vascular injury : - Brachial aery damage. Delayed union or non-union : - Delayed union or non-union may occur, especially in transverse fracture of the midshaft. The cause of non-union is distraction at fracture site due to gravity and weight of plaster. Joint stiffness : - Shoulder & elbow stiffness.