Objective:To digitally analyze and measure the anatomical relationship between screw entry points in the transverse sacroiliac joint geometric channels (S 1, S 2, S 3) and the superior gluteal artery. Methods:Enrolled in this study were 147 healthy volunteers (119 males and 28 females) with an average age of (36.2±18.3) years who had undergone CT examination at Department of Orthopedics, The Second Affiliated Hospital of Inner Mongolia Medical University from January 2020 to May 2024. The geometric channels for screws in the transverse sacroiliac joint S 1, S 2, and S 3 were determined by 3D reconstruction of the pelvic CT scan data. After the shortest distance from the branch of the superior gluteal artery to the screw entry point into the channel was measured for each segment on the left and right sides, interlateral comparisons were performed. Results:Of the 147 volunteers, 107 (72.79%) had transverse sacroiliac joint geometric channels for sacroiliac screws in S 1 vertebrae, 147 (100.00%) had transverse sacroiliac joint geometric channels for sacroiliac screws in S 2 vertebral body, and 22 cases (14.97%) had transverse sacroiliac joint geometric channels for sacroiliac screws in S 3 vertebral body. The shortest distances from the superficial branch of the superior gluteral artery to the entry point of the screw channal were (18.13±2.79) mm at S 1, (30.83±3.43) mm at S 2, and (35.88±4.22) mm at S 3 on the left side, and (18.65±3.21) mm at S 1, (31.41±3.88) mm at S 2, and (34.46±4.13) mm at S 3 on the right side. The shortest distances from the deep superior branch of the superior gluteal artery to the entry point of the screw channel were (20.81±2.93) mm at S 1, and (29.72±4.32) mm at S 2 on the left side, and (21.32±3.13) mm at S 1, and (30.13±4.66) mm at S 2 on the right side. There was no difference in the distance from the screw entry point to the superior gluteal artery in all segments between the right and the left sides ( P>0.05). The distance from the right and left screw points to the superior gluteal artery showed an increasing trend from segment S 1, to segment S 2, and to segment S 3, being the farthest in S 3. Conclusions:Transverse sacroiliac joint geometric (safe) channels at segments S 1, S 2, S 3 exist on imaging in most adults, but they may vary in the risk of injury to the superior gluteal artery. The risk of injury to the superior gluteal artery in fixation with S 1 transverse sacroiliac screws is greater than that with S 2 and S 3 transverse sacroiliac screws. The risk of injury to the superior gluteal artery is the minimal with S 3 transverse screw fixation.

Objective:To digitally analyze and measure the anatomical relationship between screw entry points in the transverse sacroiliac joint geometric channels (S 1, S 2, S 3) and the superior gluteal artery. Methods:Enrolled in this study were 147 healthy volunteers (119 males and 28 females) with an average age of (36.2±18.3) years who had undergone CT examination at Department of Orthopedics, The Second Affiliated Hospital of Inner Mongolia Medical University from January 2020 to May 2024. The geometric channels for screws in the transverse sacroiliac joint S 1, S 2, and S 3 were determined by 3D reconstruction of the pelvic CT scan data. After the shortest distance from the branch of the superior gluteal artery to the screw entry point into the channel was measured for each segment on the left and right sides, interlateral comparisons were performed. Results:Of the 147 volunteers, 107 (72.79%) had transverse sacroiliac joint geometric channels for sacroiliac screws in S 1 vertebrae, 147 (100.00%) had transverse sacroiliac joint geometric channels for sacroiliac screws in S 2 vertebral body, and 22 cases (14.97%) had transverse sacroiliac joint geometric channels for sacroiliac screws in S 3 vertebral body. The shortest distances from the superficial branch of the superior gluteral artery to the entry point of the screw channal were (18.13±2.79) mm at S 1, (30.83±3.43) mm at S 2, and (35.88±4.22) mm at S 3 on the left side, and (18.65±3.21) mm at S 1, (31.41±3.88) mm at S 2, and (34.46±4.13) mm at S 3 on the right side. The shortest distances from the deep superior branch of the superior gluteal artery to the entry point of the screw channel were (20.81±2.93) mm at S 1, and (29.72±4.32) mm at S 2 on the left side, and (21.32±3.13) mm at S 1, and (30.13±4.66) mm at S 2 on the right side. There was no difference in the distance from the screw entry point to the superior gluteal artery in all segments between the right and the left sides ( P>0.05). The distance from the right and left screw points to the superior gluteal artery showed an increasing trend from segment S 1, to segment S 2, and to segment S 3, being the farthest in S 3. Conclusions:Transverse sacroiliac joint geometric (safe) channels at segments S 1, S 2, S 3 exist on imaging in most adults, but they may vary in the risk of injury to the superior gluteal artery. The risk of injury to the superior gluteal artery in fixation with S 1 transverse sacroiliac screws is greater than that with S 2 and S 3 transverse sacroiliac screws. The risk of injury to the superior gluteal artery is the minimal with S 3 transverse screw fixation.

Objective To explore the possibility of repairing injured facial nerve with tissue engineering technology and neural stem cells(NSCs).The complex consisted of NSCs,scaffold and NT-3.NSCs were immature cells with the potential of self-renewal and multiple differentiation to neurons and glial cells.The scaffold with porous surface was made of hyaluronic acid and collagen(HA-Col gel) which degenerate in vivo after transplantation.NT-3 is the signal to promote neurons survival in vitro.Methods NSCs of S-D rat were co-cultured with scaffold and NT-3 in vitro.The two stumps of disconnected facial nerve of rabbit were re-connected with the complex.Electrophysiology and morphology tests were used to examine functional and morphological changes.Results Result] NSCs adhered to the HA-Col gel and survived.Injured facial nerve fixed by NSCs-HA-Col gel-NT-3 complex showed significant improvement in function and anatomical structure.Conclusion Combinative implant of NSCs,HA-Col gel and NT-3 may promote the regeneration of injured facial nerve.