title: Computer-aided pelvic reduction frame for anatomical closed reduction of unstable pelvic fractures.
abstract: Traditional closed reductions of unstable pelvic fractures are mainly performed by surgeons using manual manipulation and subjective verification based on intra-operative roentgenography. It is difficult to perform an accurate closed reduction because of a lack of adequate knowledge of the displacement patterns and an inability to apply the reduction in correct direction. Using the concept of the remote center of motion mechanism and computer-aided design software, we developed a pelvic reduction frame for use in anatomical closed reductions of unstable pelvic fractures. With three-dimensional reconstruction technique and the matrix algorithm, the spatial orientation of the displaced hemipelvis can be calculated and deconstructed into several rotational and translational movements that can be completed with the frame. To verify the accuracy of this system, the rotations were repeated 10 times in arbitrary degrees and directions. After the matrix is calculated, the displaced hemipelvis can be reduced to the anatomical position using our frame. The maximum residual translational and rotational displacements were less than 5 mm and 4 degrees, which indicated the accuracy of this system. The maximum average residual translation and rotation were 1.87 mm in Z-axis (ranging: 4.63-0.1 mm) and 1.1 degrees around Y-axis (ranging: 3.81-0.13 degrees), respectively. Only the Z-axial translation showed a statistically significant difference (p < 0.05). In conclusion, the proposed pelvic reduction frame could be a useful tool for the anatomical reduction of unstable pelvic fractures.
authors.affiliation: Department of Orthopaedics, Chinese PLA General Hospital, 28 Fuxing Road, Haidian District, Beijing, 100853, People's Republic of China.
authors.forename: Li-Hai
authors.initials: LH
authors.lastname: Zhang
authors.affiliation: Department of Orthopaedics, Chinese PLA General Hospital, 28 Fuxing Road, Haidian District, Beijing, 100853, People's Republic of China.
authors.forename: Jing-Xin
authors.initials: JX
authors.lastname: Zhao
authors.affiliation: Department of Orthopaedics, Chinese PLA General Hospital, 28 Fuxing Road, Haidian District, Beijing, 100853, People's Republic of China.|Department of Orthopaedics, Beijing Tsinghua Chang Gung Hospital, No. 1 Block Tiantongyuan North, Beijing, 102218, People's Republic of China.
authors.forename: Zhe
authors.initials: Z
authors.lastname: Zhao
authors.affiliation: Department of Orthopaedics, Chinese PLA General Hospital, 28 Fuxing Road, Haidian District, Beijing, 100853, People's Republic of China.|Department of Orthopaedics, Affiliated Hospital of the Academy of Military Medical Sciences, No. 8 Dongdajie Road, Beijing, 100071, People's Republic of China.
authors.forename: Xiu-Yun
authors.initials: XY
authors.lastname: Su
authors.affiliation: Department of Orthopaedics, Chinese PLA General Hospital, 28 Fuxing Road, Haidian District, Beijing, 100853, People's Republic of China.
authors.forename: Li-Cheng
authors.initials: LC
authors.lastname: Zhang
authors.affiliation: Department of Orthopaedics, Chinese PLA General Hospital, 28 Fuxing Road, Haidian District, Beijing, 100853, People's Republic of China.
authors.forename: Yan-Peng
authors.initials: YP
authors.lastname: Zhao
authors.affiliation: Department of Orthopaedics, Chinese PLA General Hospital, 28 Fuxing Road, Haidian District, Beijing, 100853, People's Republic of China.
authors.forename: Pei-Fu
authors.initials: PF
authors.lastname: Tang
mesh_terms: D050723:Fractures, Bone / Q000628:therapy*; D006801:Humans; D021621:Imaging, Three-Dimensional; D010384:Pelvic Bones / Q000293:injuries*
keywords: computer-aided design; matrix; pelvic fracture; reduction frame; remote center of motion