<prompt> Most common complication of mid shaft humerus fracture is -Radial nerve palsyMedian nerve palsyNonunionMalunion  <response>: Ans. is a i.e., Radial nerve palsy Complications of humerus shaft fractureNerve injury : - Radial nerve is the most commonly injured nerve in fracture shaft humerus. It is particularly common in oblique fractures at the junction of middle and distal third of the bone Holstein- Lews fracture.Vascular injury : - Brachial artery 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. 