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.
Affiliation
Department of Orthopaedic and Neuro-Musculoskeletal Surgery, Faculty of Life Sciences, Kumamoto University, 1-1-1 Honjo, Kumamoto 860-8556, Japan.
Journal Details
This article was published in the following journal.
Name: The Knee
ISSN: 1873-5800
Pages:
Links
- 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, Three-dimensional
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)
Imaging, Three-dimensional
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.
Echocardiography, Four-dimensional
Dynamic three-dimensional echocardiography using the added dimension of time to impart the cinematic perception of motion. (Mayo Clin Proc 1993;68:221-40)
PubMed Articles
The effect of load magnitude on three-dimensional patellar kinematics in vivo.
Studies of three-dimensional patellar kinematics done with little or no applied load may not accurately reflect kinematics at physiological load levels, and may provide different results to those acqu...
PURPOSE: Little is known about the in vivo kinematics of mobile-bearing total knee arthroplasty, especially at deep knee flexion under weight-bearing conditions. METHODS: In vivo knee kinematics was a...
PURPOSE: The objective of this study was to evaluate the in vivo knee kinematics to assess the available functional motion of the characteristic mobile-bearing prosthesis design and to examine whether...
PURPOSE: The purpose of this study was to investigate kinematic factors affecting postoperative knee flexion after cruciate-retaining (CR) total knee arthroplasty (TKA) by analysing pre- and postopera...
PURPOSE: We evaluated 3- to 6-year clinical and radiological follow-up results after NexGen((R)) LPS-flex total knee arthroplasty (TKA). METHODS: A retrospective evaluation was undertaken of 218 knees...
Clinical Trials
The aim of this prospective study is to compare the clinical and radiographic outcomes of standard and high-flexion posterior stabilized (PS) rotating-platform mobile-bearing (RP-MB) total...
Anterior Referencing Versus Posterior Referencing in Minimally Invasive Total Knee Arthroplasty
The purpose of this study is to look at two different referencing systems for total knee replacement surgery. In anterior referencing system, referencing cuts are made from the front surf...
The use of mobile phones in the operating room (OR) has become widespread, because of the lack of reports on serious problems. Since mobile phones are used in close body contact and since,...
A Biomechanical Assessment of the AST Stabilimax BAR Using Radiostereometric Analysis (RSA)
Assessment of segmental spine motion has been and continues to be, a difficult clinical problem. Errors of up to 10 degrees for simple measurements of flexion, extension and side bending...
To evaluate the safety and efficacy of the Encore Mobile-Bearing Knee. The clinical results of the Mobile-Bearing Knee will be compared to the clinical results of the Foundation Total Knee
