Qingshui Yin | PubMed Health

PubMed2006

[Recent development of computer-aided tissue engineering].

OBJECTIVE: To introduce the recent advances of the application of computer technology in tissue engineering. METHODS: The recent original articles related to computer technology, medical image technology, computer-aided design, the advanced manufacture technology were summarized and systematically analyzed. RESULTS: Computer-aided tissue engineering is a new field on tissue engineering. It is the future direction of tissue engineering study. This article reviews recent development of medical CT/MRI scanning, three-dimensional reconstruction, anatomical modeling, computer-aided design, computer-aided manufacturing, rapid prototyping, RP manufacturing of tissue engineering scaffolds and computer-aided implantation. CONCLUSION: Computer-aided tissue engineering can be used in scaffolds design and fabrication, computer-aided artificial tissue implantation. It is a new field on tissue engineering.

Computer-Aided Design↗

PubMed2004

[Experimental study of posterior pedicle screw placement on atlas].

OBJECTIVE: To assess the possibility of placing the posterior pedicle screw on atlas. METHODS: Twenty human cadaver specimens were used to insert pedicle screws in atlas, through the posterior arch or the pedicle of C1 into the lateral mass. The screw entry point was on the posterior surface of C1 posterior arch and at the intersection of the vertical line through the center of C2 inferior articular process and the horizontal line at least 3 mm below the superior rim of the C1 lamina. The screw of 3.5 mm in diameter was placed in a direction of 10 degrees medial angle and 5 dgrees upward angle. After placement of C1 pedicle screw, the distance from C1 screw entry point to the medial-lateral midpoint of C1 pedicle, the maximum length of screw trajectory and the actual screw trajectory angles were measured. The direction of screw penetrating through the cortical of C1 pedicle or lateral mass and the injuries to the vertebral artery and spinal cord were observed. RESULTS: Forty pedicle screws were placed on atlas, the mean distance from C1 screw entry point to the medial-lateral midpoint of C1 pedicle was (2.20 +/- 0.42)mm, the maximum length of screw trajectory averaged (30.51 +/- 1.59)mm, and the actual screw trajectory angle measured (9.7 +/- 0.67)degrees in a medial direction and (4.6 +/- 0.59)degrees in a upward direction. Only 1 screw penetrated the upper cortical bone of the atlas pedicle because the upward angle was too large, and 8 screws were inserted so deep that the inferior cortical bone of the C1 lateral mass was penetrated. But no injuries to the vertebral artery and spinal cord were observed. CONCLUSION: C1 posterior pedicle screw fixation is quite accessible and safe, but the surgeons should pay attention to the angle and the depth of the screw placement.

Adult↗

PubMed2002

[Mosaicplasty osteochondral grafting to repair cartilaginous defects under arthroscopy].

OBJECTIVE: To study mosaicplasty a as method of autogenous osteochondral transplantation in the treatment of cartilaginous defects. METHODS: The technique involves obtaining small cylindrical grafts from the non-weight bearing periphery of the femur at the patellar femoral joint, and transporting them to the prepared recipient site by arthroscopy. RESULTS: Fifteen patients with defects cartilaginous received mosaicptasty osteochondral grafting. Follow up for 12 to 21 months (mean 15 months) showed good results. CONCLUSION: The treatment is indicated for patients with focal cartilaginous defects under the age of 45.

Adult↗