Thomas M. Grupp
YOU?
Author Swipe
View article: Assessing Implant Stability in Cementless Femoral Components With Different Interference Fits
Assessing Implant Stability in Cementless Femoral Components With Different Interference Fits Open
Cementless total knee arthroplasty implants offer advantages over cemented implants, such as bone preservation and easier revision procedures. However, the optimal interference fit required to achieve a good press‐fit fixation, essential f…
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: Chemical, Mechanical and Tribological Effects of Artificially Aging up to 6 Weeks on Virgin and Crosslinked UHMWPE Evaluated for a TKR Design
Chemical, Mechanical and Tribological Effects of Artificially Aging up to 6 Weeks on Virgin and Crosslinked UHMWPE Evaluated for a TKR Design Open
Patients undergo total knee arthroplasty (TKA) at younger ages with the expectation that the devices will perform well over two to three decades. During this time, the ultra-high molecular weight polyethylene (UHMWPE) bearing material prop…
View article: Third Body Wear of an All-Polymer, PEEK-OPTIMA™ on Ultra-High-Molecular-Weight Polyethylene Total Knee Replacement
Third Body Wear of an All-Polymer, PEEK-OPTIMA™ on Ultra-High-Molecular-Weight Polyethylene Total Knee Replacement Open
Experimental wear simulation of a PEEK-OPTIMA™ polymer-on-UHMWPE total knee replacement has shown equivalent UHMWPE wear to conventional knee replacement materials (cobalt chrome-on-UHMWPE) when tested in a clean environment. The aim of th…
View article: Filtered and unfiltered lipoaspirates reveal novel molecular insights and therapeutic potential for osteoarthritis treatment: a preclinical in vitro study
Filtered and unfiltered lipoaspirates reveal novel molecular insights and therapeutic potential for osteoarthritis treatment: a preclinical in vitro study Open
Introduction Orthobiologics, such as autologous nanofat, are emerging as a potential treatment option for osteoarthritis (OA), a common degenerative joint causing pain and disability in the elderly. Nanofat, a minimally processed human fat…
View article: Constraint of Different Knee Implant Designs Under Anterior–Posterior Shear Forces and Internal–External Rotation Moments in Human Cadaveric Knees
Constraint of Different Knee Implant Designs Under Anterior–Posterior Shear Forces and Internal–External Rotation Moments in Human Cadaveric Knees Open
Instability remains one of the most common indications for revision after total knee arthroplasty. To gain a better understanding of how an implant will perform in vivo and support surgeons in selecting the most appropriate implant design …
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: Kinematic Patterns of Different Loading Profiles Before and After Total Knee Arthroplasty: A Cadaveric Study
Kinematic Patterns of Different Loading Profiles Before and After Total Knee Arthroplasty: A Cadaveric Study Open
One of the major goals of total knee arthroplasty (TKA) is to restore the physiological function of the knee. In order to select the appropriate TKA design for a specific patient, it would be helpful to understand whether there is an assoc…
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: Comparative Study of Zirconium Nitride Multilayer Coatings: Crystallinity, In Vitro Oxidation Behaviour and Tribological Properties Deposited via Sputtering and Arc Deposition
Comparative Study of Zirconium Nitride Multilayer Coatings: Crystallinity, In Vitro Oxidation Behaviour and Tribological Properties Deposited via Sputtering and Arc Deposition Open
This study aims to evaluate and compare the properties of a biomedical clinically established zirconium nitride (ZrN) multilayer coating prepared using two different techniques: pulsed magnetron sputtering and cathodic arc deposition. The …
View article: A New Methodology for the Accurate Measurement of Tibiofemoral Kinematics in Human Cadaveric Knees: An Evaluation of the Anterior–Posterior Laxity Pre- and Post-Cruciate Ligament Resection
A New Methodology for the Accurate Measurement of Tibiofemoral Kinematics in Human Cadaveric Knees: An Evaluation of the Anterior–Posterior Laxity Pre- and Post-Cruciate Ligament Resection Open
Anterior–posterior (AP) stability is an important measure of knee performance after total knee arthroplasty (TKA). To improve the stabilizing effect of implants designed to compensate for the loss of the cruciate ligaments, it is important…
View article: Strains on the human femur after revision total knee arthroplasty: An in vitro study using digital image correlation
Strains on the human femur after revision total knee arthroplasty: An in vitro study using digital image correlation Open
Pain at the tip of the stem of a knee prosthesis (End-of-Stem Pain) is a common problem in revision total knee arthroplasty (TKA). It may be caused by a problematic interaction between stem and bone, but the exact biomechanical correlate i…
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: Musculoskeletal Rehabilitation: New Perspectives in Postoperative Care Following Total Knee Arthroplasty Using an External Motion Sensor and a Smartphone Application for Remote Monitoring
Musculoskeletal Rehabilitation: New Perspectives in Postoperative Care Following Total Knee Arthroplasty Using an External Motion Sensor and a Smartphone Application for Remote Monitoring Open
Background: The number of total knee replacements performed annually is steadily increasing. Parallel options for postoperative care are decreasing, which reduces patient satisfaction. External devices to support physical rehabilitation an…
View article: 1st EFORT European Consensus “Medical & Scientific Research Requirements for the Clinical Introduction of Artificial Joint Arthroplasty Devices”: Background, Delphi Methodology & Consensus process
1st EFORT European Consensus “Medical & Scientific Research Requirements for the Clinical Introduction of Artificial Joint Arthroplasty Devices”: Background, Delphi Methodology & Consensus process Open
The objectives of the 1st EFORT European Consensus on ‘Medical and Scientific Research Requirements for the Clinical Introduction of Artificial Joint Arthroplasty Devices’ were foremost to focus on patient safety by establishing performanc…
View article: Introduction of innovations in joint arthroplasty: Recommendations from the ‘EFORT implant and patient safety initiative’
Introduction of innovations in joint arthroplasty: Recommendations from the ‘EFORT implant and patient safety initiative’ Open
With the implementation of the new MDR 2017/745 by the European Parliament, more robust clinical and pre-clinical data will be required due to a more stringent approval process. The EFORT Implant and Patient Safety Initiative WG1 ‘Introduc…
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: Modern Coatings in Knee Arthroplasty
Modern Coatings in Knee Arthroplasty Open
All metal implants in human bodies corrode, which results in metal ion release. This is not necessarily a problem and represents for most patients no hazard. However, both local and systemic effects are possible, including hypersensitivity…
View article: Finite Element Analysis for Pre-Clinical Testing of Custom-Made Knee Implants for Complex Reconstruction Surgery
Finite Element Analysis for Pre-Clinical Testing of Custom-Made Knee Implants for Complex Reconstruction Surgery Open
In severe cases of total knee arthroplasty, where off-the-shelf implants are not suitable or available anymore (i.e., in cases with extended bone defects or periprosthetic fractures), custom-made knee implants represent one of the few rema…
View article: The Implant Proteome—The Right Surgical Glue to Fix Titanium Implants In Situ
The Implant Proteome—The Right Surgical Glue to Fix Titanium Implants In Situ Open
Titanium implants are frequently applied to the bone in orthopedic and trauma surgery. Although these biomaterials are characterized by excellent implant survivorship and clinical outcomes, there are almost no data available on the initial…
View article: Biomechanical Effects of Stemmed Total Knee Arthroplasty on the Human Femur: A CT‐Data Based Study
Biomechanical Effects of Stemmed Total Knee Arthroplasty on the Human Femur: A CT‐Data Based Study Open
End‐of‐stem pain of the femur is a common problem in revision total knee arthroplasty (TKA). It may be caused by a problematic interaction between stem and bone, but the exact biomechanical correlate is still unknown. The aim of this prosp…
View article: Biomechanical Assessment of Mobile-Bearing Total Knee Endoprostheses Using Musculoskeletal Simulation
Biomechanical Assessment of Mobile-Bearing Total Knee Endoprostheses Using Musculoskeletal Simulation Open
The purpose of this computational study was to analyze the effects of different mobile-bearing (MB) total knee replacement (TKR) designs on knee joint biomechanics. A validated musculoskeletal model of the lower right extremity implanted w…