Establishment of a goat model of tibial bone hole defect suitable for repair using injectable bone materials / 南方医科大学学报

<p><b>OBJECTIVE</b>To prepare a goat model of tibial bone hole defect suitable for studies of bone defect repair using tissue-engineered injectable bone materials.</p><p><b>METHODS</b>A circular hole bone defect 1.2 cm in diameter was induced below the tibial medial plateau of the goat. X-ray, histological inspection, and image analysis were carried out to evaluate the validity of the model in simulating limb bone defect for the study of tissue-engineered injectable bone materials.</p><p><b>RESULTS</b>At 4 and 8 weeks after the operation, neither X-ray nor histological examination showed obvious bone tissues in the bone defect. Image analysis showed a area of new bone tissue formation of (8.79 - or + 3.63)% in the total defect area at 4 weeks, which increased to (15.41 - or + 4.21)% at 8 weeks.</p><p><b>CONCLUSION</b>The goat model of tibial bone hole defect established in this study is suitable for studying the ability of injectable bone materials for repairing limb bone defect, and offers a simple and reliable means to simulate the local condition of bone regeneration and mechanical environment of bone defect in the limbs.</p>

Design and preliminary clinical application of a new digitalized navigation template for fixation of the inferior tibiofibular joint / 南方医科大学学报

<p><b>OBJECTIVE</b>To design and prepare a new digitalized navigation template for fixation of inferior tibiofibular joint using three-dimensional reconstruction and reverse engineering techniques.</p><p><b>METHODS</b>Five patients with inferior tibiofibular joint rupture without fibula fracture underwent three-dimensional CT scanning of the lower limbs. The image data were transferred into Mimics software, and after reconstruction of the three-dimensional models of inferior tibiofibular joint rupture and saving in .stl format, the three-dimensional models were imported into Imageware10.0 software to determine the three-dimensional plane of reference. The location of the optimal pedicle channel was defined using reverse engineering and AO internal fixation principle. The template was designed according to the anatomic features of the fibular surface, and the optimal pedicle channel and the template were overlapped as the navigational template, which was manufactured by rapid prototyping. The inferior tibiofibular joint was reduced and the template was placed distally on the external fibula, and the location for screw insertion was defined by the navigation template.</p><p><b>RESULTS AND CONCLUSION</b>The digitalized model of the inferior tibiofibular joint was established. The navigation template manufactured offered good compatibility and was applied successfully for fixation of the inferior tibiofibular joint. This approach provides a new means for fixation of ruptured inferior tibiofibular joint using the reverse engineering and digitized 3-dimensional reconstruction techniques.</p>