This study is a prospective randomized controlled trial aiming to reduce shoulder pain after lung surgery. Shoulder pain on the surgical side is common after video-assisted thoracoscopic lobectomy, affecting about 20%-58% of patients. It can limit coughing, moving, and sleeping, and may delay recovery.

The pain may come from two sources: nerve stimulation during surgery and the prolonged arm position used during the operation. While nerve stimulation is hard to avoid, the arm position can be modified. Currently, most pain treatments rely on medications or nerve blocks given after surgery, which have side effects or risks. No one has tried to prevent the pain by changing the arm position during the operation.

We plan to enroll 270 patients scheduled for thoracoscopic lung removal surgery at Chengdu Shangjin Nanfu Hospital. Patients will be randomly divided into two groups. One group will receive the standard side-lying position with arms extended on arm boards (traditional position). The other group will receive a modified position where both arms are bent at the elbows and wrapped with surgical drapes, without using arm boards (modified double-arm wrap position).

Our main goal is to compare the rate of shoulder pain (on the operated side) within 24 hours after surgery between the two groups. We will also compare pain on the opposite shoulder, pain severity, time needed to set up the position, total surgery time, hospital stay, and any nerve or skin complications.

This study has been approved by the Biomedical Ethics Review Committee of West China Hospital, Sichuan University. All participants will provide written informed consent. The findings may help improve intraoperative positioning and enhance early recovery after lung surgery.