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Author

  • Zachow, Stefan (215)
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  • 3d-­reconstruction from 2d X­rays (2)
  • Articulated Models, Statistical Shape And Intensity Models, 2D/3D Anatomy Reconstruction, Pelvic Parameters Measurement, Total Hip Arthroplasty (2)
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Evaluation of the Intranasal Flow Field through Computational Fluid Dynamics (CFD) (2013)
Hildebrandt, Thomas ; Goubergrits, Leonid ; Heppt, Werner ; Bessler, Stefan ; Zachow, Stefan
Kinematic Differences Between Gender Specific And Traditional Knee Implants (2013)
Saevarsson, Stefan ; Sharma, Gulshan ; Ramm, Heiko ; Lieck, Robert ; Hutchison, Carol ; Werle, Jason ; Montgomery, Sigrun ; Romeo, Carolina ; Zachow, Stefan ; Anglin, Carolyn
Knee Pose and Geometry Pre- and Post-Total Knee Arthroplasty Using Computed Tomography (2012)
Sharma, Gulshan ; Ho, Karen ; Saevarsson, Stefan ; Ramm, Heiko ; Lieck, Robert ; Zachow, Stefan ; Anglin, Carolyn
Sequential-Biplane Radiography for Measuring Pre and Post Total Knee Arthroplasty Kinematics (2012)
Sharma, Gulshan ; Saevarsson, Stefan ; Amiri, Shahram ; Montgomery, Sigrun ; Ramm, Heiko ; Lichti, Derek ; Zachow, Stefan ; Anglin, Carolyn
Kinematic Comparison Between Gender Specific and Traditional Femoral Implants (2012)
Stefan, Saevarsson ; Gulshan, Sharma ; Sigrun, Montgomery ; Karen, Ho ; Ramm, Heiko ; Lieck, Robert ; Zachow, Stefan ; Carol, Hutchison ; Jason, Werle ; Carolyn, Anglin
Computed tomography analysis of knee pose and geometry before and after total knee arthroplasty (2012)
Ho, Karen ; Saevarsson, Stefan ; Ramm, Heiko ; Lieck, Robert ; Zachow, Stefan ; Sharma, Gulshan ; Rex, Erica ; Amiri, Shahram ; Wu, Barnabas ; Leumann, Andre ; Anglin, Carolyn
Radiological method for measuring patellofemoral tracking and tibiofemoral kinematics before and after total knee replacement (2012)
Saevarsson, Stefan ; Sharma, Gulshan ; Amiri, Shahram ; Montgomery, Sigrun ; Ramm, Heiko ; Lichti, Derek ; Lieck, Robert ; Zachow, Stefan ; Anglin, Carolyn
Changes in Knee Shape and Geometry Resulting from Total Knee Arthroplasty (2018)
Akbari Shandiz, Mohsen ; Boulos, Paul ; Sævarsson, Stefan ; Ramm, Heiko ; Fu, Chun Kit ; Miller, Stephen ; Zachow, Stefan ; Anglin, Carolyn
Changes in knee shape and geometry resulting from total knee arthroplasty can affect patients in numerous important ways: pain, function, stability, range of motion, and kinematics. Quantitative data concerning these changes have not been previously available, to our knowledge, yet are essential to understand individual experiences of total knee arthroplasty and thereby improve outcomes for all patients. The limiting factor has been the challenge of accurately measuring these changes. Our study objective was to develop a conceptual framework and analysis method to investigate changes in knee shape and geometry, and prospectively apply it to a sample total knee arthroplasty population. Using clinically available computed tomography and radiography imaging systems, the three-dimensional knee shape and geometry of nine patients (eight varus and one valgus) were compared before and after total knee arthroplasty. All patients had largely good outcomes after their total knee arthroplasty. Knee shape changed both visually and numerically. On average, the distal condyles were slightly higher medially and lower laterally (range: +4.5 mm to −4.4 mm), the posterior condyles extended farther out medially but not laterally (range: +1.8 to −6.4 mm), patellofemoral distance increased throughout flexion by 1.8–3.5 mm, and patellar thickness alone increased by 2.9 mm (range: 0.7–5.2 mm). External femoral rotation differed preop and postop. Joint line distance, taking cartilage into account, changed by +0.7 to −1.5 mm on average throughout flexion. Important differences in shape and geometry were seen between pre-total knee arthroplasty and post-total knee arthroplasty knees. While this is qualitatively known, this is the first study to report it quantitatively, an important precursor to identifying the reasons for the poor outcome of some patients. Using the developed protocol and visualization techniques to compare patients with good versus poor clinical outcomes could lead to changes in implant design, implant selection, component positioning, and surgical technique. Recommendations based on this sample population are provided. Intraoperative and postoperative feedback could ultimately improve patient satisfaction.
Mehrschichtige Oberflächenmodelle zur computergestützten Planung in der Chirurgie (1998)
Stalling, Detlev ; Seebass, Martin ; Zachow, Stefan
Polygonale Schädelmodelle bilden ein wichtiges Hilfsmittel für computergestützte Planungen im Bereich der plastischen Chirurgie. Wir beschreiben, wie derartige Modelle automatisch aus hochaufgelösten CT-Datensätzen erzeugt werden können. Durch einen lokal steuerbaren Simplifizierungsalgorithmus werden die Modelle so weit vereinfacht, daß auch auf kleineren Graphikcomputern interaktives Arbeiten möglich wird. Die Verwendung eines speziellen Transparenzmodells ermöglicht den ungehinderten Blick auf die bei der Planung relevanten Knochenstrukturen und läßt den Benutzer zugleich die Kopfumrisse des Patienten erkennen.
Distributed Visualization with OpenGL Vizserver: Practical Experiences (2000)
Hege, Hans-Christian ; Merzky, Andre ; Zachow, Stefan
The increasing demand for distributed solutions in computing technology does not stop when it comes to visualization techniques. However, the capabilities of todays applications to perform remote rendering are limited by historical design legacys. Especially the popular X11 protokoll, which has been proven to be extremely flexible and usefull for remote 2D graphics applications, breaks down for the case of remote 3D rendering. In this white paper, we give a short overview of generic remote rendering technologies available today, and compare their performance to the recently released vizserver by SGI: a network extension to the SGI OpenGL rendering engines.
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