Final answer:
The most common complication after distal humerus ORIF is possible compression of the artery to the forearm, resulting in reduced blood flow and potential damage to the forearm muscles. Humeral fractures may also damage major nerves associated with shoulder and upper limb muscles.
Step-by-step explanation:
The most common complication after distal humerus ORIF (open reduction internal fixation) is possible compression of the artery to the forearm due to swelling of the surrounding tissues. This can result in reduced blood flow and ischemia (lack of oxygen) to the forearm muscles, leading to irreparable damage. Additionally, humeral fractures may also damage the major nerves associated with shoulder and upper limb muscles.