Open, randomized, parallel controlled prospective clinical study design was used in this study.Subjects were patients with 2-4 displaced non-flail rib fractures.Operation group (Group 1) : minimally invasive internal fixation operation group under spontaneous breathing anesthesia.In the operation group of minimally invasive internal fixation under autonomic respiratory anesthesia, the fracture was determined preoperatively by chest CT+ three-dimensional reconstruction of the ribs, and the optimal incision location was determined. The fracture was exposed through as many small incisions as possible, and fixed with titanium plate or clon-type plate. During the operation, the autonomic respiratory anesthesia and paraviral nerve block technology was adopted.In the conservative group (group 2), routine treatment measures such as analgesia and chest strap fixed were adopted.The purpose of this study was to evaluate the safety, feasibility, and efficacy of minimally invasive and conservative treatment for rib fractures with different Numbers of displaced ends.

An open, randomized, parallel controlled prospective clinical study design type was used in this study. Subjects were patients with two to four displaced non-flail chest fractures of the ribs. Operation group (Group 1) : minimally invasive internal fixation operation group under spontaneous breathing anesthesia. In the operation group of minimally invasive internal fixation under autonomic respiratory anesthesia, the fracture was determined preoperatively by chest CT+ three-dimensional reconstruction of the ribs, and the optimal incision location was determined. The fracture was exposed through as many small incisions as possible, and fixed with titanium plate or clon-type plate. During the operation, the autonomic respiratory anesthesia and paraviral nerve block technology was adopted. In the conservative group (group 2), routine treatment measures such as analgesia, hemostasis and chest band fixation were adopted. The effects of the two treatments on lung function, pain index, complications and QoL were evaluated. It provides theoretical basis for the treatment of rib fracture

Inclusion Criteria:

1. Unilateral thoracic trauma, fractured ends of rib fractures displaced 2-4 places
2. Displaced fracture（CT image shows double displacement of bone cortex） located in the 3rd to 10th rib
3. The number of broken ends of displaced fractures is greater than that of undisplaced fractures
4. The length of time from injury to hospitalization <24 hours
5. Age range（18-70）
6. ASA grade I-II
7. BMI < 30
8. Preoperative partial arterial oxygen pressure >60mmHg, partial arterial carbon dioxide pressure <50mmHg

Exclusion Criteria:

1. Difficult airway
2. History of esophageal reflux
3. Myasthenia gravis
4. Abnormal coagulation system
5. History of gastrointestinal ulcer or bleeding
6. History of anaesthesia related drug allergy

A history of asthma or chronic obstructive emphysema

8. Women during pregnancy

9. Flail chest

10. Combined with severe craniocerebral trauma and external abdominal injuries

11. Recent use of clopidogrel, warfarin and aspirin seriously affects blood clotting

12. Self-administered analgesics after injury

13.Massive hemopneumothorax requires emergency surgery

14. Patients who cannot tolerate surgery

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The data will not be Shared with other researchers