ABSTRACT
Objective@#To investigate the feasibility of an accuracy evaluation method for 3D reconstructed bone model based on 3D reconstruction software Arigin3D Pro.@*Methods@#Pig femurs were used as solid models which were scanned by CT and MRI respectively. The scan data were imported into software Arigin3D Pro for 3D model reconstruction by 3 operators with different reconstruction experience (≤1 year, 2 to 3 years, and ≥4 years, respectively). Each operator reconstructed the femurs 3 times and in each reconstruction measured the diameter of the femoral head, the length of the femur and the width of the knee joint at the distal end of the femur 3 times respectively using software Geomagic Wrap. The above parameters of the solid models were measured using a vernier caliper. The parameter values of reconstructed models and solid models were compared and the differences were analyzed.@*Results@#The measurements by Geomagic Wrap showed deviations between the CT and MRI reconstruction models and the solid models, and the maximum deviation percentages were 1.47% and 1.08%, respectively. The percentages of intra-operater difference ranged from 0.29% to 1.53%; the 3D models reconstructed by operators with different reconstruction experience were not identical.@*Conclusions@#It is a feasible accuracy evaluation method to compare key parameters between the 3D bone model reconstructed by software Arigin3D Pro and the real animal bone. The deviations of 3D reconstructed bone model based on CT and MRI images are acceptable. The accuracy of 3D bone construction is related to the difference in operators.
ABSTRACT
Objective To investigate the feasibility of an accuracy evaluation method for 3D reconstructed bone model based on 3D reconstruction software Arigin3D Pro.Methods Pig femurs were used as solid models which were scanned by CT and MRI respectively.The scan data were imported into software Arigin3D Pro for 3D model reconstruction by 3 operators with different reconstruction experience (≤1 year,2 to 3 years,and ≥4 years,respectively).Each operator reconstructed the femurs 3 times and in each reconstruction measured the diameter of the femoral head,the length of the femur and the width of the knee joint at the distal end of the femur 3 times respectively using software Geomagic Wrap.The above parameters of the solid models were measured using a vernier caliper.The parameter values of reconstructed models and solid models were compared and the differences were analyzed.Results The measurements by Geomagic Wrap showed deviations between the CT and MRI reconstruction models and the solid models,and the maximum deviation percentages were 1.47％ and 1.08％,respectively.The percentages of intra-operater difference ranged from 0.29％ to 1.53％;the 3D models reconstructed by operators with different reconstruction experience were not identical.Conclusions It is a feasible accuracy evaluation method to compare key parameters between the 3D bone model reconstructed by software Arigin3D Pro and the real animal bone.The deviations of 3D reconstructed bone model based on CT and MR1 images are acceptable.The accuracy of 3D bone construction is related to the difference in operators.
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Objective To explore application of our self-designed U-shaped transdermal surgical navigator based on three-dimensional reverse design in cannulated screwing for femoral neck fracture Methods A retrospective study was done of 5 patients with femoral neck fracture who had been treated from August 2016 to March 2017.They were 3 men and 2 women,aged from 33 to 60 years (average,46.5 years).Thin layer CT scanning was conducted on the patients' affected hip (at the left side in 2 cases and at the right side in 3).Based on their CT data,3D design software and 3D printing technique were used to manufacture the U-shaped transdermal surgical navigator and a real-sized model of the fracture.Operations were simulated using the U-shaped transdermal surgical navigator on the fracture model to determine the angle,depth and location of the screwing.Fixation of the fracture with cannulated screws was conducted after confirmation of satisfactory surgical parameters.The postoperative X-ray films of the patients were reviewed.Evaluations were conducted of the screw position,operating time,volume of operative bleeding,and number of intraoperative X-ray shots.Results The screw positions in the 5 patients were consistent with their preoperative design.Four patients had only one shot of fluoroscopy and one patient 3 shots.Their operating time ranged from 15 to 30 minutes,averaging 22.5 minutes;their bleeding ranged from 5 to 10 mL,averaging 7.5 mL.The 5 patients were followed up for an average of 4.5 months (from 3 to 6 months).By the Harris scoring at their final follow-ups,one was excellent,3 good and one fair.No complications like pain,functional impairment of the joint,or collapse or necrosis of the femoral head occurred during the follow-up.Conclusions Our self-designed U-shaped transdermal surgical navigator based on three-dimensional reverse design can significandy improve the accuracy and safety of the cannulated screwing for femoral neck fractures.The operation is minimally invasive,reducing operating time and intraoperative blood loss.