3/30/2023 0 Comments Kinematics input to postviewAs it suggests, this is invasive and is typically only done in cadaver studies for validation ( Bey et al., 2006, 2008). Implantable bead tracking is accurate to within <0.4 mm translations and <0.9 degree rotations, with beads being implanted into the bones ( Bey et al., 2008). Kinematic assessment of joint angles through dynamic experimental imaging methods currently include: (1) implantable bead tracking with imaging and (2) single plane fluoroscopy. Weightbearing and non-weightbearing lateral radiographs evaluated TAR range of motion at maximum limits of dorsi- and plantarflexion however, this approach cannot measure dynamic tasks ( Yamaguchi et al., 2011). Medical imaging techniques have been used to visualize two dimensional views of a TAR implant in vivo. To accurately evaluate TAR movement independent from possible adjacent joint compensations, another experimental method involving in vivo medical imaging is needed. Skin-based motion capture marker definitions typically define the calcaneus and talus as a rigid body relative to the distal tibia, due to the talus being deeply embedded beneath the skin with measured motion being a contribution of the tibiotalar and subtalar joints within the foot (e.g., tibio-calcaneal). However, motion capture lacks independent differentiation of tibiotalar and adjacent subtalar joint movement. Motion capture studies demonstrated reduced range of motion of the surgical TAR limb ( Piriou et al., 2008 Brodsky et al., 2013 Flavin et al., 2013 Singer et al., 2013). Skin-based motion capture tracking is one of the most common ways to measure joint kinematics. Accordingly, kinematic measurements for the prosthetic tibiotalar joint could provide insight of altered movement patterns. TAR failure may in part be caused by altered biomechanics ( Tochigi et al., 2005 Espinosa et al., 2010). Measurements of in vivo kinematics could improve our clinical understanding of failures in TAR patients, leading to better long-term surgical outcomes. The successful implementation of our new tracking methodology with a hybrid model presents a new approach to evaluate in vivo TAR kinematics. Articular surface distance calculations were reported as an average of 1.3 mm gap during the entirety of overground walking. Tracking verification indicated realistic alignment of the hybrid models with an evenly distributed distance map pattern during the trial. In vivo tracking verifications were performed during overground walking using a distance calculation between the implant articular surfaces to evaluate the model-based tracking 3D solution. The patient performed a self-selected overground walk during which dual fluoroscopy images were collected at 200 Hz. We evaluated a patient following total ankle replacement to demonstrate feasibility. To develop this methodology, we created a hybrid three-dimensional (3D) model that contained both: (1) the segmented bone and (2) the CAD models of the TAR components. The aim of this study was to develop a methodology to measure in vivo TAR kinematics using inputs of computer-aided design (CAD) models, dual fluoroscopy and CT imaging with metal artifact reduction. One challenge with this approach is dealing with metal artifact in the CT images that distorts implant visualization and the surrounding bone to implant interfaces. With dual fluoroscopy, computed tomography (CT) images are acquired to track bone motion. Kinematics of the prosthetic tibiotalar joint in TAR patients have yet to be measured using dual fluoroscopy. 4Scientific Computing and Imaging Institute, University of Utah, Salt Lake City, UT, United Statesīiomechanical data could improve our clinical understanding of failures in total ankle replacement (TAR) patients, leading to better surgical approaches and implant designs.3Department of Physical Therapy, University of Utah, Salt Lake City, UT, United States.2Department of Biomedical Engineering, University of Utah, Salt Lake City, UT, United States.1Orthopaedic Research Laboratory, Department of Orthpaedics, University of Utah, Salt Lake City, UT, United States.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |