J Biomech 2008 Dec 18;41(16):3332-9. Epub 2008 Nov 18.
Scientific Affairs, Stryker Europe, Thalwil, Switzerland.
Download full-text PDF
Clin Biomech (Bristol, Avon) 2011 Jan;26(1):52-7
Shilley Center for Orthopaedic Research and Education at Scripps Clinic, La Jolla, CA 92037, United States.
Background: many patellofemoral complications such as anterior knee pain, subluxation, fracture, wear, and aseptic loosening after total knee arthroplasty are attributed to malrotation of the femoral component. Rotating-platform mobile bearings can reduce malrotation between the tibial and femoral components and may also improve patellofemoral maltracking.
Methods: a computer model (LifeMOD/KneeSIM) of a weight-bearing deep knee bend was validated using cadaver knees tested in an Oxford-type knee rig. Read More
Clin Orthop Relat Res 2001 Nov(392):38-45
Duquesne University, Pittsburgh, PA 15282, USA.
Femoral component rotation is important in total knee arthroplasty to optimize patellofemoral and tibiofemoral kinematics. More recently, the epicondylar axis has been cited as the definitive landmark for femoral component rotation. However, there are few studies to support the validity of this rotational landmark and its effect on the patellofemoral and tibiofemoral articulations. Read More
J Orthop Res 2001 Jul;19(4):614-20
School of Health Sciences, Duquesne University, Pittsburgh, PA 15282, USA.
The mechanical success of a total knee replacement demands stable patellar tracking without subluxation and, stable tracking, in turn, can depend largely on the medial-lateral forces restraining the patella. Patellar button medialization has been advocated as a means of reducing subluxation, and experimental evidence has shown femoral component rotation also affects medial-lateral forces. Surgeons have choices in femoral component rotation and patellar button medialization and must frequently make intra-operative decisions concerning component placement because of anatomical variations among patients. Read More
Knee 2005 Apr;12(2):81-8
Orthopaedic Research Laboratories, Scripps Clinic Center for Orthopaedic Research and Education, 11025 N Torrey Pines Road, Suite 140, La Jolla, CA 92037, USA.
Total knee arthroplasty implant designs with larger extensor moment arms theoretically should generate lower extensor forces for the same externally applied loads. This study measured knee kinematics, quadriceps forces, and patellofemoral forces under conditions of dynamic knee extension under load in two knee designs with differing quadriceps moment arms. Six human cadaver knees were tested both before implantation and after sequential implantation with two posterior cruciate retaining designs. Read More