The Visual Research On Three-dimensional Intercondylar Notch Based On MR Images

Part1. The anatomy research on3-D digital anatomic model based on MR images of intercondylar notch compared with entity anatomy measured dataObjectiveWith the development of Computer Assisted Technique and digital anatomy, to establish the digital anatomic model of intercondylar notch could find a new path for anatomic study on intercondylar notch. To explore the accuracy and feasibility of3-D digital model of femoral intercondylar notch based on MR images through comparing the differences of anatomic data between3-D digital model and cadaver.Methods1. To scan and get2-D MR images from18male fresh frozen cadaveric knees and14female fresh cadaveric knees. The MR images were imported into Mimics Software for3-D intercondylar notch reconstruction, and the related anatomical data which were gotten from the3-D digital model named as3-D reconstruction group and the data of ICW, ECW, ICH, BLL, LCW, MCW, SLLC, SLMC, ALC, AMC were measured.2. The cadaveric of18male and14female knees were dissected and measured the anatomic data which were named as entity group and the data of ICW, ECW, ICH, BLL, LCW, MCW, SLLC, SLMC, ALC, AMC were measured.3. To analyze the data of the two groups by paired-samples t test of SPSS17.0statistical software, with a=0.05as a standard deviation.Results1. The measured values of ICW, ECW, ICH, BLL, LCW, MCW, SLLC, SLMC, ALC, AMC in male had no differences between the3-D reconstruction group and entity group (P>0.05). 2. The measured values of ICW, ECW, ICH, BLL, LCW, MCW, SLLC, SLMC, ALC, AMC in female had no differences between the3-D reconstruction group and entity group (P>0.05).ConclusionThe3-D digital model based on MR images could accurately show the entity specimens information. It could be used for anatomic research of the normal femoral intercondylar notch. It was important for diagnosis and treatment on the related diseases of intercondylar notch and ACL reconstruction.Part2. The digital anatomic research on3-D digital intercondylar notch model based on MR imagesObjectiveWith the development of Computer Assisted Technique and digital anatomy, the digital anatomic model of intercondylar notch had been used for anatomic study. It had been provided a new path for anatomic study on intercondylar notch. To establish3-D intercondylar notch of the healthy adult knee based on2-D MR Images, and the index of anatomy and its difference between sex, left and right knees. To study the feasibility of virtual intercondylar notchplasty before the ACL reconstruction.Methods1. There were15male and15female bilateral knees of healthy adult scanned by2-D MR images. The MR images were imported into Mimics Software for3-D intercondylar notch reconstruction, and the related anatomic data of the3-D digital model were gotten.2. The intercondylar notchplasty was simulated with3-D intercondylar notch model in Mimics software.3. The anatomic relationship between intercondylar notch and ACL was evaluated during operation and after operation.4. To analyze the data of the two groups of male and female by independent sample t test and two groups of left and right knee by paired-samples t test of SPSS17.0statistical software, with a=0.05as a standard deviation. Results1. The values of ICW, ECW, ICH, BLL, LCW, MCW in3-D digital knee model had significant difference between male and female(p<0.05), But no difference in the NWI between male and female(p>0.05).2. There was no significant difference between the left and right on ICW, ECW, ICH, BLL, LCW, MCW, NWI, NSI in3-D digital knee model of male and female (p>0.05).3. Intercondylar notchplasty was done by preoperative simulated plan with3-D digital model, and it was just fit for the intercondylar notch top and side wall, and the postoperative3-D digital model reconstruction of the ACL and intercondylar notch wall had no impingement.ConclusionThe anatomy of intercondylar notch was significant difference between male and female, but it had no difference in NWI and NSI, and the data of intercondylar notch had no difference in left and right. NWI was one of indexes which showed the narrow level of intercondylar notch. The virtual intercondylar notchplasty was feasible, and it could provide preoperative plan for intercondylar notchplasty in ACL reconstruction, and it showed important clinical instructing significance.