Total knee replacement with natural rollback
| Autor: | Martin Michael Wachowski, Peter Balcarek, Caspar Graf Stauffenberg, Jan Philipp Schüttrumpf, Stephan Frosch, Christoph Fiedler, Tim Alexander Walde, Hans Nägerl, Dietmar Kubein-Meesenburg, Jochen Fanghänel, Karl-Heinz Frosch |
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| Rok vydání: | 2010 |
| Předmět: |
musculoskeletal diseases
Cartilage Articular Friction Knee Joint Computer science medicine.medical_treatment Rolling resistance Prosthesis Design Prosthesis 03 medical and health sciences 0302 clinical medicine Gait (human) Patellar Ligament medicine Humans Femur Knee Tibia Range of Motion Articular Arthroplasty Replacement Knee Gait Orthodontics 030222 orthopedics 030229 sport sciences General Medicine Anatomy Patella musculoskeletal system Arthroplasty Biomechanical Phenomena Radiography Range of motion Knee Prosthesis human activities Rollback Developmental Biology |
| Zdroj: | Annals of anatomy = Anatomischer Anzeiger : official organ of the Anatomische Gesellschaft. 194(2) |
| ISSN: | 1618-0402 |
| Popis: | A novel class of total knee replacement (AEQUOS G1) is introduced which features a unique design of the articular surfaces. Based on the anatomy of the human knee and differing from all other prostheses, the lateral tibial "plateau" is convexly curved and the lateral femoral condyle is posteriorly shifted in relation to the medial femoral condyle. Under compressive forces the configuration of the articular surfaces of human knees constrains the relative motion of femur and tibia in flexion/extension. This constrained motion is equivalent to that of a four-bar linkage, the virtual 4 pivots of which are given by the centres of curvature of the articulating surfaces. The dimensions of the four-bar linkage were optimized to the effect that constrained motion of the total knee replacement (TKR) follows the flexional motion of the human knee in close approximation, particularly during gait. In pilot studies lateral X-ray pictures have demonstrated that AEQUOS G1 can feature the natural rollback in vivo. Rollback relieves the load of the patello-femoral joint and minimizes retropatellar pressure. This mechanism should reduce the prevalence of anterior knee pain. The articulating surfaces roll predominantly in the stance phase. Consequently sliding friction is replaced by the lesser rolling friction under load. Producing rollback should minimize material wear due to friction and maximize the lifetime of the prosthesis. To definitely confirm these theses one has to wait for the long term results. |
| Databáze: | OpenAIRE |
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