RESUMEN
BACKGROUND: Humeral fracture is a common long bone fracture in orthopedic clinical diagnosis and treatment. OBJECTIVE: To investigate the local temperature increase owing to changes in the specific absorption ratio (SAR) of the human body caused by humeral bone nails during magnetic resonance imaging (MRI). METHODS: A refined geometric model of the upper body was constructed via data segmentation and post-processing using the digital human image dataset. Finally, the geometric model was imported into COMSOL, a 3-T magnetic resonance coil was built, and the operating frequency (128 MHz) was set to analyze the SAR of the bone-nail pair and temperature changes. RESULTS: The analysis of the changes after bone-nail implantation under different tissue conditions revealed that the SAR and temperature after implantation and fixation were three times higher than those before, and the areas with abrupt changes in SAR and temperature were primarily concentrated in the bone-nail area. CONCLUSION: In MRI, metal implants can cause local elevation of the SAR near the implant in the human body, resulting in a temperature increase around the implant. Consequently, long-term scanning can damage the human body.
RESUMEN
BACKGROUND: Tibial plateau fracture is a common fracture encountered in the clinic. OBJECTIVE: This study determined the optimal timing and surgical approach for patients with tibial plateau fracture. METHODS: Fifty-two patients with complex tibial plateau fractures were treated in our hospital (the People's Hospital of Zhongjiang County) between 2013 and 2015. These patients were recruited as participants in this study; all patients were randomly allocated into two groups of 26 patients each. Patients in Group 1 underwent single-incision, single-plate knee surgeries via an antero-lateral approach, and patients in Group 2 underwent anterior median incisions of the knee for double-plate surgeries. The effects of the approaches were compared and analyzed. RESULTS: The best time to perform surgery was 6-8 days post-injury. The anterior median incision, double-plate method approach was better than the antero-lateral, single-incision, single-plate method. For the former method, the healing among middle-aged and young patients was better than that of elderly patients, and that healing of men was slightly better than that of female patients. However, the degree of healing among patients was > 80% at 5 months postoperatively. The purpose of surgical management has been fully achieved. CONCLUSION: The optimal timing of surgery for patients with complex tibial plateau fractures is 6-8 days post-injury. The surgical approach needs to be determined based on the actual condition of the patient. However, the treatment effect of an anterior median incision, double-plate method is better, and the recovery rate may approach 80% at 5 months postoperatively.