A5027366530- Total Knee Arthroplasty Outcomes
- Orthopaedic implants and arthroplasty
- Knee injuries and reconstruction techniques
- Orthopedic Infections and Treatments
- Lower Extremity Biomechanics and Pathologies
- Osteoarthritis Treatment and Mechanisms
- Musculoskeletal pain and rehabilitation
- Sports Performance and Training
- Hip disorders and treatments
- Spine and Intervertebral Disc Pathology
- Prosthetics and Rehabilitation Robotics
- Muscle activation and electromyography studies
- Occupational health in dentistry
- Tendon Structure and Treatment
- Advanced X-ray and CT Imaging
- Scoliosis diagnosis and treatment
- Spinal Fractures and Fixation Techniques
- Noise Effects and Management
- Infrared Thermography in Medicine
- Stroke Rehabilitation and Recovery
- Structural Engineering and Vibration Analysis
- Sports injuries and prevention
- Effects of Vibration on Health
- Geotechnical Engineering and Underground Structures
- Motor Control and Adaptation
Berlin Institute of Health at Charité - Universitätsmedizin Berlin
2014-2024
Freie Universität Berlin
2019
Humboldt-Universität zu Berlin
2019
Charité - Universitätsmedizin Berlin
2011-2017
With the increasing success of hip joint replacements, average age patients has decreased, have become more active and their expectations implant durability risen. Thus, pre-clinical endurance tests on implants require defining realistic in vivo loads from younger patients. These simplifications to be applicable for simulator numerical analyses. Here, contact forces were measured with instrumented ten subjects during nine most physically demanding frequent activities daily living. Typical...
The loads acting in knee joints must be known for improving joint replacement, surgical procedures, physiotherapy, biomechanical computer simulations, and to advise patients with osteoarthritis or fractures about what activities avoid. Such data would also allow verification of test standards implants. This work analyzes from 8 subjects instrumented implants, which allowed measuring the contact forces moments joint. implants were powered inductively transmitted at radio frequency. time...
Combined knowledge of the functional kinematics and kinetics human body is critical for understanding a wide range biomechanical processes including musculoskeletal adaptation, injury mechanics, orthopaedic treatment outcome, but also validation models. Until now, however, no datasets that include internal loading conditions (kinetics), synchronized with advanced kinematic analyses in multiple subjects have been available. Our goal was to provide such thereby foster new how vivo knee joint...
Activities with high spinal loads should be avoided by patients back problems. Awareness about these activities and knowledge of the associated are important for proper design pre-clinical testing implants. The on an instrumented vertebral body replacement have been telemetrically measured approximately 1000 combinations parameters in 5 over a period up to 65 months postoperatively. A database containing, among others, extreme values load components more than 13,500 datasets was searched 10...
Tibiofemoral alignment is important to determine the rate of progression osteoarthritis and implant survival after total knee arthroplasty (TKA). Normally, surgeons aim for neutral tibiofemoral following TKA, but this has been questioned in recent years. The study was evaluate whether varus or valgus indeed leads increased medial lateral forces during static dynamic weight-bearing activities.Tibiofemoral contact moments were measured nine patients with instrumented implants. Medial force...
Aquatic exercises are widely used for rehabilitation or preventive therapies in order to enable mobilization and muscle strengthening while minimizing joint loading of the lower limb. The load reducing effect water due buoyancy is a main advantage compared on land. However, also drag forces have be considered that act opposite relative motion body segments require higher activity. Due these opposing effects loading, load-reducing during aquatic remains unknown. aim this study was quantify...
When walking long distances, hip prostheses heat up due to friction. The influence of articulating materials and lubricating properties synovia on the final temperatures, as well any potential biological consequences, are unknown. Such knowledge is essential for optimizing implant materials, identifying patients who possibly at risk loosening, proving concepts current joint simulators. An instrumented with telemetric data transfer was developed measure temperatures in vivo. A clinical study...
Abstract A conventional method to unload the medial compartment of patients with gonarthrosis and thus achieve pain reduction is use laterally wedged shoes. Our aim was measure in vivo their effect on loads using instrumented knee implants. Medial tibio‐femoral contact forces were measured six subjects implants during walking following shoes: without wedge, 5 10 mm wedges under lateral sole, a insole (5 mm). Measurements repeated shoes combination an ankle‐stabilizing orthosis. Without...
Introduction After hip surgery, it is the orthopedist's decision to allow full weight bearing prevent complications or prescribe partial for bone ingrowth fracture consolidation. While most loading conditions in joint during activities of daily living are known, remains unclear how demanding physiotherapeutic exercises are. Recommendations clinical rehabilitation have been established, but these guidelines vary and not scientifically confirmed. The aim this study was provide a basis...
Abstract The validity of observational methods in ergonomics is still challenging research. Criterion terms concurrent the most commonly studied. However, studies comparing with biomechanical values are rare. Thus, aim this study to compare Ovako Working Posture Analysing System (OWAS) and Rapid Entire Body Assessment (REBA) vivo load measurements at hip, spine, knee during stoop squat lifting 14 participants. results reveal that OWAS REBA action levels (AL) can distinguish between different...
During whole body vibrations, the total contact force in knee and hip joints consists of a static component plus vibration-induced dynamic component. In two different cohorts, these forces were measured with instrumented joint implants at vibration frequencies amplitudes. For three standing positions on platforms, compared to forces, related peak during walking. A biomechanical model served for estimating muscle increases from increases. The median 122% 168% (knee), resp. 93% 141% (hip),...
Understanding the sources of error is critical before models musculoskeletal system can be usefully translated. Using in vivo measured tibiofemoral forces, impact uncertainty muscle-tendon parameters on accuracy knee contact force estimates a generic model was investigated following probabilistic approach. Population variability introduced to routine modeling framework by perturbing input lower limb muscles around their baseline values. ground reaction and skin marker trajectory data...
Background: High friction moments in hip implants contribute to the aseptic loosening of cementless cups, which there are approximately 100,000 cases per year; sustained joint loading may cause such high moments. The most “critical” physical activities associated with were identified this study. Methods: Friction cup telemetrically measured about 33,000 times endoprostheses 9 subjects during >1,400 different activities. highest compared cup’s fixation stability limit 4 Nm. Results: A...
Total knee arthroplasty aims to mimic the natural kinematics by optimizing implant geometry, but it is not clear how loading relates tibio-femoral anterior-posterior translation or internal-external pivoting. We hypothesised that point of pivot in transverse plane governed location highest axial force. Tibio-femoral was measured using an instrumented tibial component six total patients (aged 65-80y, 5-7y post-op) during 5-6 squat repetitions, while were captured a mobile video-fluoroscope....
Some approaches in total knee arthroplasty aim for an oblique joint line to achieve even medio-lateral load distribution across the condyles during stance phase of gait. While there is much focus on angulation static frontal radiographs, precise knowledge associated dynamic orientation and internal loading limited. The this study was analyze how alignment radiographs relates distribution, based direct measurements kinematics. A unique novel combination telemetrically measured vivo...
Industrial back support exoskeletons are a promising solution to alleviate lumbar musculoskeletal strain. Due the complexity of spinal loading, evaluation EMG data alone has been considered insufficient assess their effects, and complementary kinematic dynamic required. However, acquisition marker-based kinematics is challenging with exoskeletons, as anatomical reference points, particularly on pelvis, occluded by exoskeleton structures. The aim this study was therefore develop validate...
Background: Swimming is commonly recommended as postoperative rehabilitation following total hip arthroplasty (THA) and knee (TKA). So far, in vivo joint loads during swimming remain undescribed. Methods: In were measured 6 patients who underwent THA 5 TKA with instrumented implants. Joint loads, including the resultant contact force (F Res ), torsional moment around femoral shaft axis or tibial (M Tors bending at middle of neck Bend Tne medial ratio (MFR) knee, breaststroke 0.5, 0.6, 0.7...