Allan Maas
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View article: Knee contact force alone is insufficient to validate joint mechanics in musculoskeletal models
Knee contact force alone is insufficient to validate joint mechanics in musculoskeletal models Open
Musculoskeletal modelling plays a crucial role in understanding joint mechanics, particularly in applications such as surgical planning and implant design. As a common approach, these models are generally validated by assessing their abili…
View article: On the consequences of intra-operative release versus over-tensioning of the posterior cruciate ligament in total knee arthroplasty
On the consequences of intra-operative release versus over-tensioning of the posterior cruciate ligament in total knee arthroplasty Open
Intra-operative tensioning of the posterior cruciate ligament (PCL) in total knee arthroplasty (TKA) is commonly based on the surgeon’s experience, resulting in a possibly loose or overly tight PCL. To date, the consequences of different P…
View article: Comparison of IMU-Based Knee Kinematics with and without Harness Fixation against an Optical Marker-Based System
Comparison of IMU-Based Knee Kinematics with and without Harness Fixation against an Optical Marker-Based System Open
The use of inertial measurement units (IMUs) as an alternative to optical marker-based systems has the potential to make gait analysis part of the clinical standard of care. Previously, an IMU-based system leveraging Rauch–Tung–Striebel sm…
View article: Validation of Inertial-Measurement-Unit-Based Ex Vivo Knee Kinematics during a Loaded Squat before and after Reference-Frame-Orientation Optimisation
Validation of Inertial-Measurement-Unit-Based Ex Vivo Knee Kinematics during a Loaded Squat before and after Reference-Frame-Orientation Optimisation Open
Recently, inertial measurement units have been gaining popularity as a potential alternative to optical motion capture systems in the analysis of joint kinematics. In a previous study, the accuracy of knee joint angles calculated from iner…
View article: Posterior tibial slope influences joint mechanics and soft tissue loading after total knee arthroplasty
Posterior tibial slope influences joint mechanics and soft tissue loading after total knee arthroplasty Open
As a solution to restore knee function and reduce pain, the demand for Total Knee Arthroplasty (TKA) has dramatically increased in recent decades. The high rates of dissatisfaction and revision makes it crucially important to understand th…
View article: A Reproducible and Robust Representation of Tibiofemoral Kinematics of the Healthy Knee Joint during Stair Descent using REFRAME – Part I: REFRAME Foundations and Validation
A Reproducible and Robust Representation of Tibiofemoral Kinematics of the Healthy Knee Joint during Stair Descent using REFRAME – Part I: REFRAME Foundations and Validation Open
In clinical movement biomechanics, kinematic measurements are collected to characterise the motion of articulating joints and investigate how different factors influence movement patterns. Representative time-series signals are calculated …
View article: A Framework for Analytical Validation of Inertial-Sensor-Based Knee Kinematics Using a Six-Degrees-of-Freedom Joint Simulator
A Framework for Analytical Validation of Inertial-Sensor-Based Knee Kinematics Using a Six-Degrees-of-Freedom Joint Simulator Open
The success of kinematic analysis that relies on inertial measurement units (IMUs) heavily depends on the performance of the underlying algorithms. Quantifying the level of uncertainty associated with the models and approximations implemen…
View article: Uncertainty in Muscle–Tendon Parameters can Greatly Influence the Accuracy of Knee Contact Force Estimates of Musculoskeletal Models
Uncertainty in Muscle–Tendon Parameters can Greatly Influence the Accuracy of Knee Contact Force Estimates of Musculoskeletal Models Open
Understanding the sources of error is critical before models of the musculoskeletal system can be usefully translated. Using in vivo measured tibiofemoral forces, the impact of uncertainty in muscle–tendon parameters on the accuracy of kne…
View article: The Influence of Mathematical Definitions on Patellar Kinematics Representations
The Influence of Mathematical Definitions on Patellar Kinematics Representations Open
A correlation between patellar kinematics and anterior knee pain is widely accepted. However, there is no consensus on how they are connected or what profile of patellar kinematics would minimize anterior knee pain. Nevertheless, answering…
View article: Towards a New, Pre-Clinical, Subject-Independent Test Model for Kinematic Analysis after Total Knee Arthroplasty—Influence of the Proximo-Distal Patella Position and Patellar Tendon Stiffness
Towards a New, Pre-Clinical, Subject-Independent Test Model for Kinematic Analysis after Total Knee Arthroplasty—Influence of the Proximo-Distal Patella Position and Patellar Tendon Stiffness Open
Although simulation models are heavily used in biomechanical research and testing of TKA implants, pre-clinical tools for a holistic estimation of implant performance under dynamic loading conditions are rare. The objective of this study w…