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RISCritical Examination of Methods to Determine Tibiofemoral Kinematics and Tibial Contact Kinematics Based on Analysis of Fluoroscopic Images
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Goals of knee replacement surgery are to restore function and maximize implant longevity. To determine how well these goals are satisfied, tibial femoral kinematics and tibial contact kinematics are of interest. Tibiofemoral ...
Previously Unrecognized Source of Error in the Change in Maximum Total Point Motion to Determine Continuous Migration of Unstable Tibial Baseplates
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In radiostereometric analysis (RSA), continuous migration denoted as ΔMTPM is the difference between maximum total point motion (MTPM) at 2 years relative to time zero and MTPM at 1 year relative to time zero. Continuous ...
Analysis of Variation in Sagittal Curvature of the Femoral Condyles
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In designing femoral components, which restore native (i.e., healthy) knee kinematics, the flexion–extension (F-E) axis of the tibiofemoral joint should match that of the native knee. Because the F–E axis is governed by ...
Measurement Error Versus Repeated Measurements: A Guide Describing Two Methods for Computing Bias and Precision of Migration Measurements From Double Examinations Using Radiostereometric Analysis
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Radiostereometric analysis is a method to measure implant migration where an ISO standard recommends double examinations (i.e., acquisition of two independent sets of biplanar images on the same day) to compute bias (i.e., ...
A New Handheld Tool to Select the Correct Tibial Insert Thickness by Measuring the Force to Push a Trial Insert Into Position During Total Knee Arthroplasty Surgery
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: During total knee arthroplasty (TKA) surgery, an important step is determining the correct insert thickness for each patient. If the insert is too thick, then stiffness results. Or conversely, if the insert is too thin, ...
Errors in Calculating Anterior–Posterior Tibial Contact Locations in Total Knee Arthroplasty Using Three-Dimensional Model to Two-Dimensional Image Registration in Radiographs: An In Vitro Study of Two Methods
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Knowledge of anterior–posterior (A-P) tibial contact locations provides an objective assessment of the relative motion of the tibia on the femur following total knee arthroplasty (TKA), which can be used to compare the ...
Characterization and Correction of Errors in Computing Contact Location Between Curved Articular Surfaces: Application to Total Knee Arthroplasty
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In total knee arthroplasty (TKA), one common metric used to evaluate innovations in component designs, methods of component alignment, and surgical techniques aimed at decreasing the high rate of patient-reported dissatisfaction ...
An Improved Tibial Force Sensor to Compute Contact Forces and Contact Locations In Vitro After Total Knee Arthroplasty
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Contact force imbalance and contact kinematics (i.e., motion of the contact location in each compartment during flexion) of the tibiofemoral joint are both important predictors of a patient's outcome following total knee ...
Tibial Contact Force and Contact Location Errors of the VERASENSE
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The OrthoSensor VERASENSE knee system is a commercially available instrumented tibial insert that provides real-time intraoperative measurements of tibial contact force and contact location to guide surgeons toward improving ...
Conditions for Use and Implementation of Globally-Aligned Versus Local Baseplate Coordinate Systems When Computing Migration Using Radiostereometric Analysis
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Radiostereometric analysis can be used for computing movement of a tibial baseplate relative to the tibia (termed migration) to determine stability of fixation. Quantifying migration in six degrees of freedom requires ...