Three-dimensional kinematics during deep-flexion kneeling in mobile-bearing total knee arthroplasty.
Summary of "Three-dimensional kinematics during deep-flexion kneeling in mobile-bearing total knee arthroplasty."
We performed an in vivo radiographic analysis of tibiofemoral and polyethylene (PE) insert motions during weight-bearing kneeling beyond 120° of flexion in one high-flexion knee arthroplasty design to determine if kinematics changed over time and if axial rotation occur between the PE insert and the tibial baseplate. Twenty knees implanted with a posterior-stabilized rotating-platform (RP) knee arthroplasty were postoperatively evaluated at 3, 6, and 12months. The averaged flexion angles were 122°, 129°, and 131° at 3, 6, and 12months, respectively, showing that the improvement of flexion was achieved up to 6months. The femoral condyles translated posteriorly from extension to maximum flexion. There was a significant increase in AP translation of femoral lateral condyle in the maximum flexion kneeling between 12months and the two other intervals (p=0.0003 at 3months and p=0.016 at 6months), while no differences in those of medial condyle between all intervals. Almost all rotation occurred at the surface between the tibial baseplate and the PE insert (p=0.0479 at 3months, p=0.0008 at 6months, and p=0.0479 at 12months), almost no rotation occurred at the surface between the PE insert and the femoral component. There were significant increases in the amount of internal rotation angle during full flexion between the tibial component and the PE insert up to 12months. Knees implanted with this RP knee arthroplasty design show deep-flexion knee kinematics that are consistent with the implant design intent.
Department of Orthopaedic and Neuro-Musculoskeletal Surgery, Faculty of Life Sciences, Kumamoto University, 1-1-1 Honjo, Kumamoto 860-8556, Japan.
This article was published in the following journal.
Name: The Knee
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/20833548
- DOI: http://dx.doi.org/10.1016/j.knee.2010.08.006
Medical and Biotech [MESH] Definitions
Echocardiography amplified by the addition of depth to the conventional two-dimensional ECHOCARDIOGRAPHY visualizing only the length and width of the heart. Three-dimensional ultrasound imaging was first described in 1961 but its application to echocardiography did not take place until 1974. (Mayo Clin Proc 1993;68:221-40)
The process of generating three-dimensional images by electronic, photographic, or other methods. For example, three-dimensional images can be generated by assembling multiple tomographic images with the aid of a computer, while photographic 3-D images (HOLOGRAPHY) can be made by exposing film to the interference pattern created when two laser light sources shine on an object.
Four-dimensional Computed Tomography
Three-dimensional computed tomographic imaging with the added dimension of time, to follow motion during imaging.
Two-dimensional Difference Gel Electrophoresis
Methods of comparing two or more samples on the same two-dimensional gel electrophoresis gel.
Dynamic three-dimensional echocardiography using the added dimension of time to impart the cinematic perception of motion. (Mayo Clin Proc 1993;68:221-40)
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