In traditional orthognathic surgery, the dental splint technique is typically used to assist surgeons to reposition the maxilla or mandible. However, the design and manufacturing of dental splints is time-consuming and labor-intensive, and the templates may not applicable for some complicated cases due to the anatomic intricacies in the maxillofacial region. During recent years, computer-aided navigation technology has been widely used in oral and maxillofacial surgery. However, due to the limitation of current calibration and registration methods, it has been rarely reported for the motion tracking of intraoperative reposition for the loosed bone graft. In this study, a novel surgical navigation system was developed. With the use of this system, not only the surgical saw can be tracked in real-time, but also the loosed bone graft can be navigated under the guidance of the interactive 2D and 3D views until it is aligned with the preoperatively planned position. The phantom experiments validated the feasibility of our surgical navigation system, and the mean error of image-guided reposition was 1.03 ± 0.10 mm, which was significantly more accurate than the mean error of 5.57 ± 1.40 mm based on the non-navigated methods.

Background To evaluate therapeutic efficacy of minimally invasive and small incision surgery [minimally invasive surgery (MIS)] in patients with non-flail chest rib fractures through a prospective cohort study. Methods This study included 98 patients with non-flail chest rib fractures (≥3 displaced fractures) and 66 patients undergoing MIS served as the experimental group and 32 patients receiving conservative treatment served as the matched control group. Pain index and indicators of pulmonary function [vital capacity (VC); forced expiratory volume in one second (FEV1); peak expiratory flow (PEF)] for the two groups were assessed and compared at the time of admission and before discharge. In addition, duration of pain, time required for the patient to regain the ability to perform daily self-care, mental labor, and moderate-to-severe physical labor, and duration of chest discomfort were measured during long-term follow-up and compared between the two groups. Results There were also no significant differences (P>0.05) in pain index (8 vs. 8) or indicators of pulmonary function (VC: 31.0% vs. 26.5%; FEV1: 29.9% vs. 26.7%; PEF: 15.2% vs. 12.0%) were found between the MIS and conservative treatment groups at the time of admission; while pain index (3 vs. 6), VC (42.1% vs. 35.3%), and FEV1 (44.2% vs. 35.9%) were significantly different between the two groups (P<0.05) but not in PEF (21.2% vs. 19.6%) before discharge. Long-term follow-up showed that duration of pain, time required for the patient to regain the ability to engage in daily self-care, mental labor, and moderate-to-severe physical labor, and duration of chest discomfort in the MIS group were significantly more improved than in the conservative treatment group (P<0.05). Conclusions MIS was a simple and safe treatment that significantly relieved chest pain and rapidly restored pulmonary function and improved the long-term quality of life of patients with non-flail chest rib fractures of ≥3 ribs with displacement.

BACKGROUND:With the popularization of minimal invasive surgery, video-assisted thoracoscopic surgery (VATS) is gradually replacing conventional thoracotomy for lung cancer and is even used for osteosarcoma patients with pulmonary metastasis. In this study, we characterized the need for open surgery by comparing computer tomography (CT) diagnosis and postoperative pathology of patients with pulmonary metastases of osteosarcoma.METHODS:A retrospective analysis was carried out on patients with underwent surgery for pulmonary metastatic osteosarcoma admitted to our hospital between January 2008 and July 2018. The numbers of pulmonary metastatic nodules suspected by preoperative CT scan were calculated in addition to the number of nodules which were resected and pathologically confirmed to be metastatic during surgery. The Spearman correlation coefficient between the number of nodules on preoperative CT scan and the number of lesions pathologically confirmed was calculated.RESULTS:In total, 69 patients undergoing 96 thoracotomy operations were included in this study. The median interval between preoperative CT examination and operation was 7 days (range, 1-44 days). The median number of the suspected nodules on preoperative CT and the pathologically positive metastases resected during operation were 1 and 3, respectively. Remarkably, 36 (37.5%) thoracotomies revealed that more metastatic nodules were detected during thoracotomy than preoperative CT scans.CONCLUSIONS:Preoperative CT examination omits a few small pulmonary metastases of osteosarcoma and there is rare progress in recent years. Therefore, we recommend that patients with pulmonary metastases of undergo thoracotomy to locate and resect all metastases as much as possible through intraoperative direct palpation.

ObjectiveTo investigate the methods and clinical efficacy of reconstruction of chest defects with titanium sternal fixation system after the surgical resection of sternal tumors.MethodsA total of 6 patients with sternal tumor who were diagnosed and underwent resection and repair of the chest wall defects by titanium plates system, from 2017.3 to 2017.11 in our hospital were reviewed. Their pathological types, surgical reconstruction methods, follow-up results were analyzed.ResultsSix cases of sternal tumor were completely resected and the sternums were reconstructed with titanium sternal fixation system. There was no operative death, postoperative chest wall deformity, abnormal breathing or complications of respiratory circulation. After 3 to 10months of follow-up, there was no loose screw or plate exposure. Not only the thoracic appearances were good, but patients' satisfaction was high.ConclusionsSurgical resection is the best treatment for sternal tumors, no matter it is benign or malignant. Titanium sternal fixation system combine with other soft materials can reconstruct the chest wall well after resection, and this technique is efficient as well as easy to learn.