BACKGROUND:There are currently various surgical methods of patel a fracture, and they have advantages and disadvantages, thus cannot wel meet the requirements of patients.
OBJECTIVE:To evaluate biomechanical properties of internal fixation plate to treat patel ar fracture and to provide theoretical evidence for clinical application.
METHODS:According to the statistics of patel a in the Chinese population, a titanium al oy spider internal fixation plate was designed and manufactured for the treatment of patel ar fractures. Knee joint specimens in six fresh cadavers were randomly divided into two groups and the comminuted fracture model of patel a were established. The models were fixed with internal fixation plate of patel a and NiTi patel ar concentrator. Biomechanical tests were carried out to compare the biomechanical properties.
RESULTS AND CONCLUSION:Both the two fixation methods could meet the 1-kN quadriceps femoris contraction. The internal fixation plate of patel a was superior to NiTi patel ar concentrator in the patel ar isolation shift, muscle strength and joint strength, as wel as mechanical properties of patel a-point surface. There were significant differences between the two groups (P<0.05). The internal fixation plate of patel a is designed in accordance with the anatomical and biomechanical properties of the patel a, the fixation strength can completely meet clinical requirement and deserve further application.

Objective:To investigate the diversity and clinical effect of supraclavicular island flap in repairing the defect after head and neck tumor surgery. Methods:A retrospective analysis was performed on 30 patients who received the repair of head and neck defects with supraclavicular island flaps at Department of Otorhinolaryngology Head and Neck Surgery of the First Affiliated Hospital of Chongqing Medical University from January 2017 to March 2023. The sites and types of defects, intraoperative blood loss, time of flaps preparation, areas of flaps, survival of the flaps and other complications were recorded. Results:A total of 30 patients were enrolled, including 26 males and 4 females, aged 36-82 years. Among them, 22 patients with hypopharyngeal partial defect were repaired （19 patients with ipsilateral defect and 3 patients with contralateral defect）. In addition, 2 patients were repaired with contralateral pectoralis major musculocutaneous flap around the hypopharynx, the neck skin defect was repaired in 2 patients, the parotid skin defect was repaired in 2 patients, the temporal bone skin defect was repaired in 1 patient, and the cervical esophageal defect was repaired in 1 patient. The average blood loss during the operation was 8 ml, and the average time was 32 min. The flap areas ranged from 5.0 cm×4.0 cm to 20.0 cm×8.0 cm. 27 of 30 flaps survived（90.0%）, and pharyngeal fistula occurred in 6 patients after operation（4 flaps survived after local dressing）. One patient was complicated with venous thrombosis（the flap necrosis after local dressing）. Shoulder and neck functions（lift, internal rotation and abduction） were not significantly affected in 29 patients, and the function of 1 patient with shoulder infection was not affected after treatment. Conclusion:Supraclavicular island flap is a highly vascularized axial fascial flap. It is easy to make, thin, and soft in texture, and can be used to repair different sites and types of postoperative head and neck tumor defects with a low donor site complication rate. Good results in post-operative repair of head and neck tumors are worth promoting.
Male ; Female ; Humans ; Plastic Surgery Procedures ; Retrospective Studies ; Skin Transplantation ; Soft Tissue Injuries/surgery* ; Treatment Outcome ; Surgical Flaps ; Head and Neck Neoplasms/surgery*