In vivo flexion and kinematics of the knee after TKA: comparison of a conventional and a high flexion cruciate-retaining TKA design.
ABSTRACT This study investigated the in vivo 6DOF knee kinematics and tibiofemoral contact location after total knee arthroplasty using a conventional and a high flexion cruciate retaining component (15 NexGen CR, 11 NexGen CR-Flex). Each patient performed a single-leg lunge while being imaged by a dual fluoroscopic imaging system. Data were analyzed at hyperextension, 0 degrees to 90 degrees in 15 degrees intervals, and at maximum flexion. The average maximum weight-bearing flexion for all the CR patients was 110.1 degrees +/- 13.4 degrees , and for all the CR-Flex patients was 108.2 degrees +/- 13.2 degrees . No difference was seen in the maximum flexion achieved by the patients, and the kinematics demonstrated by the groups was similar. However, at high flexion, the tibiofemoral articulating surfaces were more conforming in the CR-Flex design than the CR design, suggesting that the use of the high flexion component improved the tibiofemoral contact environment at high flexion in patients who could achieve high flexion.
Conference Paper: The Central User Services System For ERS-1Geoscience and Remote Sensing Symposium, 1988. IGARSS '88. Remote Sensing: Moving Toward the 21st Century., International; 10/1988
- Geoscience and Remote Sensing Symposium, 1988. IGARSS '88. Remote Sensing: Moving Toward the 21st Century., International; 10/1988
- [Show abstract] [Hide abstract]
ABSTRACT: The growing interest into multi-sensor systems able to determine general attributes of a process under monitoring, has also involved the qualitative analysis of liquids; various methodologies to develop taste sensors, often referred to as "e-tongues" have been presented in the literature. The fundamental idea of this paper is to investigate how an adequate signal processing approach applied to a mature and affordable sensor technique (voltammetry) can address the issue of extracting an aggregate chemical information, useful to characterize the liquid under measurement. The methodological approach to the processing of the signal, an application experiment, and the test set which has been built for the experiment are described here. In the proposed approach, dimensionality reduction is obtained using the compaction properties of DCT (discrete cosine transform), where the transform is followed by an iterative orthogonalization procedure for the feature extraction step; the capability of discriminating between different samples is also discussed via representing each collected sequence in a low dimensionality feature spaceInstrumentation and Measurement Technology Conference, 2005. IMTC 2005. Proceedings of the IEEE; 06/2005